Enable string processing by default.

Make frontend flag `-enable-experimental-string-processing` default to true.

SwiftCompilerSources/CMakeLists.txt

@@ -77,6 +77,9 @@ function(add_swift_compiler_modules_library name)
       "-Xfrontend" "-validate-tbd-against-ir=none"
       "-Xfrontend" "-enable-cxx-interop"
       "-Xcc" "-UIBOutlet" "-Xcc" "-UIBAction" "-Xcc" "-UIBInspectable")
+  if (NOT BOOTSTRAPPING_MODE STREQUAL "HOSTTOOLS")
+    list(APPEND swift_compile_options "-Xfrontend" "-disable-implicit-string-processing-module-import")
+  endif()
 
   if(CMAKE_BUILD_TYPE STREQUAL Debug)
     list(APPEND swift_compile_options "-g")

lib/Frontend/CompilerInvocation.cpp

@@ -607,8 +607,7 @@ static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
   // Determine whether string processing is enabled
   Opts.EnableExperimentalStringProcessing =
     Args.hasFlag(OPT_enable_experimental_string_processing,
-                 OPT_disable_experimental_string_processing,
-                 Args.hasArg(OPT_enable_bare_slash_regex));
+                 OPT_disable_experimental_string_processing);
 
   // Add a future feature if it is not already implied by the language version.
   auto addFutureFeatureIfNotImplied = [&](Feature feature) {

test/Frontend/module-alias-explicit-build.swift

@@ -33,6 +33,11 @@
 // RUN: echo "\"moduleName\": \"_Concurrency\"," >> %/t/inputs/map.json
 // RUN: echo "\"modulePath\": \"%/concurrency_module\"," >> %/t/inputs/map.json
 // RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json
+// RUN: echo "}," >> %/t/inputs/map.json
+// RUN: echo "{" >> %/t/inputs/map.json
+// RUN: echo "\"moduleName\": \"_StringProcessing\"," >> %/t/inputs/map.json
+// RUN: echo "\"modulePath\": \"%/string_processing_module\"," >> %/t/inputs/map.json
+// RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json
 // RUN: echo "}]" >> %/t/inputs/map.json
 
 /// Create a module Foo that imports Cat with -module-alias Cat=Bar with an explicit module loader

test/IDE/print_module_comments.swift

@@ -1,7 +1,7 @@
 // RUN: %empty-directory(%t)
 //
 // Build swift modules this test depends on.
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-module %S/Inputs/foo_swift_module.swift -emit-module-path %t/foo_swift_module.swiftmodule -emit-module-doc-path %t/foo_swift_module.swiftdoc
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module %S/Inputs/foo_swift_module.swift -emit-module-path %t/foo_swift_module.swiftmodule -emit-module-doc-path %t/foo_swift_module.swiftdoc
 //
 // RUN: %target-swift-ide-test -print-module -source-filename %s -I %t -module-to-print=foo_swift_module > %t.printed.txt
 // RUN: diff %t.printed.txt %S/Inputs/foo_swift_module.printed.comments.txt

test/IRGen/ELF-remove-autolink-section.swift

@@ -1,4 +1,4 @@
-// RUN: %swiftc_driver -emit-ir %s -o - -Xfrontend -disable-implicit-concurrency-module-import | %FileCheck %s -check-prefix ELF
+// RUN: %swiftc_driver -emit-ir %s -o - -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %FileCheck %s -check-prefix ELF
 
 // Check that the swift auto link section is available in the object file.
 // RUN: %swiftc_driver -c %s -o %t -Xfrontend -disable-implicit-concurrency-module-import

test/Index/Store/cross-import-overlay.swift

@@ -3,7 +3,7 @@
 // RUN: cp -r %S/../Inputs/CrossImport %t/CrossImport
 // RUN: %{python} %S/../../CrossImport/Inputs/rewrite-module-triples.py %t/CrossImport %module-target-triple
 
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -c -index-store-path %t/idx -module-cache-path %t/mcp -index-system-modules -index-ignore-stdlib -enable-cross-import-overlays %s -Fsystem %t/CrossImport -o %t/file1.o -module-name cross_import_overlay
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -c -index-store-path %t/idx -module-cache-path %t/mcp -index-system-modules -index-ignore-stdlib -enable-cross-import-overlays %s -Fsystem %t/CrossImport -o %t/file1.o -module-name cross_import_overlay
 // RUN: c-index-test core -print-unit %t/idx > %t/units
 
 import A

test/Index/Store/unit-from-compile.swift

@@ -1,7 +1,7 @@
 // RUN: %empty-directory(%t)
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -c -index-store-path %t/idx %s -o %t/file1.o -module-name some_module_test
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -c -index-store-path %t/idx %s -o %t/file1.o -module-name some_module_test
 // RUN: c-index-test core -print-unit %t/idx | %FileCheck %s
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -c -index-store-path %t/idx_opt %s -o %t/file1.o -module-name some_module_test -O
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -c -index-store-path %t/idx_opt %s -o %t/file1.o -module-name some_module_test -O
 // RUN: c-index-test core -print-unit %t/idx | %FileCheck %s -check-prefix=OPT
 
 // CHECK: file1.o

test/Index/Store/unit-one-file-multi-file-invocation.swift

@@ -1,5 +1,5 @@
 // RUN: %empty-directory(%t)
-// RUN: %target-build-swift -Xfrontend -disable-implicit-concurrency-module-import -index-file -index-file-path %s %s %S/Inputs/SwiftModuleA.swift -module-name unit_one_test -o %t/00-output_for_index -index-store-path %t/idx
+// RUN: %target-build-swift -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import -index-file -index-file-path %s %s %S/Inputs/SwiftModuleA.swift -module-name unit_one_test -o %t/00-output_for_index -index-store-path %t/idx
 // RUN: c-index-test core -print-unit %t/idx | %FileCheck %s -implicit-check-not SwiftShims
 
 // The output is sorted by last path component, so make sure the top-level entry

test/Index/Store/unit-pcm-dependency.swift

@@ -1,17 +1,17 @@
 // RUN: rm -rf %t
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -index-store-path %t/idx -primary-file %s -o %t/s1.o -I %S/Inputs -typecheck -module-cache-path %t/mcp -enable-objc-interop
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -index-store-path %t/idx -primary-file %s -o %t/s1.o -I %S/Inputs -typecheck -module-cache-path %t/mcp -enable-objc-interop
 // RUN: c-index-test core -print-unit %t/idx | %FileCheck %s -check-prefixes=FILE1,FILE1-PCM
 
 // If the module cache already exists, the pcm gets indexed.
 // RUN: rm -rf %t/idx
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -index-store-path %t/idx -primary-file %s -o %t/s1.o -I %S/Inputs -typecheck -module-cache-path %t/mcp -enable-objc-interop
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -index-store-path %t/idx -primary-file %s -o %t/s1.o -I %S/Inputs -typecheck -module-cache-path %t/mcp -enable-objc-interop
 // RUN: c-index-test core -print-unit %t/idx | %FileCheck %s -check-prefixes=FILE1,FILE1-PCM
 
 // FIXME: index the bridging header!
 
 // RUN: %empty-directory(%t)
 // RUN: echo 'import ClangModuleA' > %t/s2.swift
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -index-store-path %t/idx %s %t/s2.swift -o %t/s1.o -o %t/s2.o -I %S/Inputs -c -emit-module -module-name main -emit-module-path %t/main.swiftmodule -module-cache-path %t/mcp -enable-objc-interop
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -index-store-path %t/idx %s %t/s2.swift -o %t/s1.o -o %t/s2.o -I %S/Inputs -c -emit-module -module-name main -emit-module-path %t/main.swiftmodule -module-cache-path %t/mcp -enable-objc-interop
 // RUN: c-index-test core -print-unit %t/idx > %t/both.txt
 // RUN: %FileCheck %s -check-prefixes=FILE1,FILE1-PCM < %t/both.txt
 // RUN: %FileCheck %s -check-prefixes=FILE2,FILE2-PCM < %t/both.txt
@@ -21,7 +21,7 @@
 
 // RUN: %empty-directory(%t)
 // RUN: echo 'import ClangModuleA' > %t/s2.swift
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -index-store-path %t/idx -index-ignore-clang-modules %s %t/s2.swift -o %t/s1.o -o %t/s2.o -I %S/Inputs -c -emit-module -module-name main -emit-module-path %t/main.swiftmodule -module-cache-path %t/mcp -enable-objc-interop
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -index-store-path %t/idx -index-ignore-clang-modules %s %t/s2.swift -o %t/s1.o -o %t/s2.o -I %S/Inputs -c -emit-module -module-name main -emit-module-path %t/main.swiftmodule -module-cache-path %t/mcp -enable-objc-interop
 // RUN: c-index-test core -print-unit %t/idx > %t/both.txt
 // RUN: %FileCheck %s -check-prefixes=FILE1,FILE1-IGNORE < %t/both.txt --dump-input-filter all
 // RUN: %FileCheck %s -check-prefixes=FILE2,FILE2-IGNORE < %t/both.txt

test/Index/Store/unit-with-bridging-header.swift

@@ -1,9 +1,9 @@
 // RUN: %empty-directory(%t)
-// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -disable-implicit-concurrency-module-import -emit-pch -index-store-path %t/idx -o %t/bridge-head.pch %S/Inputs/bridge-head.h
-// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -disable-implicit-concurrency-module-import -typecheck -import-objc-header %t/bridge-head.pch -primary-file %s -o %t/s1.o -index-store-path %t/idx
+// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-pch -index-store-path %t/idx -o %t/bridge-head.pch %S/Inputs/bridge-head.h
+// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -typecheck -import-objc-header %t/bridge-head.pch -primary-file %s -o %t/s1.o -index-store-path %t/idx
 // RUN: c-index-test core -print-record %t/idx | %FileCheck %s --check-prefix=PCH-RECORD
 // RUN: c-index-test core -print-unit %t/idx | %FileCheck %s --check-prefix=PCH-UNIT
-// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -disable-implicit-concurrency-module-import -typecheck -import-objc-header %S/Inputs/bridge-head.h -primary-file %s -o %t/s1.o -index-store-path %t/idx2
+// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -typecheck -import-objc-header %S/Inputs/bridge-head.h -primary-file %s -o %t/s1.o -index-store-path %t/idx2
 // RUN: c-index-test core -print-unit %t/idx2 | %FileCheck --check-prefix=TEXTUAL-UNIT %s
 
 // PCH-RECORD: bridge-include.h

test/ModuleInterface/ModuleCache/module-cache-diagnostics.swift

@@ -24,11 +24,11 @@
 // Setup phase 2: build modules, pushing timestamps of inputs and intermediates into the past as we go.
 //
 // RUN: %{python} %S/Inputs/make-old.py %t/leaf.swift %t/other.swift
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -I %t -emit-module-interface-path %t/LeafModule.swiftinterface -module-name LeafModule %t/leaf.swift -emit-module -o /dev/null
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -I %t -emit-module-interface-path %t/LeafModule.swiftinterface -module-name LeafModule %t/leaf.swift -emit-module -o /dev/null
 // RUN: %{python} %S/Inputs/make-old.py %t/LeafModule.swiftinterface
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -I %t -module-cache-path %t/modulecache -emit-module-interface-path %t/OtherModule.swiftinterface -module-name OtherModule %t/other.swift -emit-module -o /dev/null
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -I %t -module-cache-path %t/modulecache -emit-module-interface-path %t/OtherModule.swiftinterface -module-name OtherModule %t/other.swift -emit-module -o /dev/null
 // RUN: %{python} %S/Inputs/make-old.py %t/modulecache/LeafModule-*.swiftmodule %t/OtherModule.swiftinterface
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -I %t -module-cache-path %t/modulecache -emit-module -o %t/TestModule.swiftmodule -module-name TestModule %s
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -I %t -module-cache-path %t/modulecache -emit-module -o %t/TestModule.swiftmodule -module-name TestModule %s
 // RUN: %{python} %S/Inputs/make-old.py %t/modulecache/OtherModule-*.swiftmodule
 //
 //
@@ -41,7 +41,7 @@
 // RUN: %{python} %S/Inputs/make-old.py %t/LeafModule.swiftinterface
 // RUN: %{python} %S/Inputs/check-is-old.py %t/LeafModule.swiftinterface
 // RUN: rm %t/TestModule.swiftmodule
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -I %t -module-cache-path %t/modulecache -emit-module -o %t/TestModule.swiftmodule -module-name TestModule %s  2>&1 | sed '/WARNING: TRYING Scope exclusively/d' >%t/warn.txt
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -I %t -module-cache-path %t/modulecache -emit-module -o %t/TestModule.swiftmodule -module-name TestModule %s  2>&1 | sed '/WARNING: TRYING Scope exclusively/d' >%t/warn.txt
 // RUN: %{python} %S/Inputs/check-is-new.py %t/modulecache/OtherModule-*.swiftmodule %t/modulecache/LeafModule-*.swiftmodule
 // "check warn.txt exists and is empty"
 // RUN: test -e %t/warn.txt -a ! -s %t/warn.txt
@@ -56,7 +56,7 @@
 // RUN: %{python} %S/Inputs/make-old.py %t/LeafModule.swiftinterface
 // RUN: %{python} %S/Inputs/check-is-old.py %t/LeafModule.swiftinterface
 // RUN: rm %t/TestModule.swiftmodule
-// RUN: not %target-swift-frontend -disable-implicit-concurrency-module-import -I %t -module-cache-path %t/modulecache -emit-module -o %t/TestModule.swiftmodule -module-name TestModule %s >%t/err.txt 2>&1
+// RUN: not %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -I %t -module-cache-path %t/modulecache -emit-module -o %t/TestModule.swiftmodule -module-name TestModule %s >%t/err.txt 2>&1
 // RUN: %{python} %S/Inputs/check-is-old.py %t/modulecache/OtherModule-*.swiftmodule %t/modulecache/LeafModule-*.swiftmodule
 // RUN: %FileCheck %s -check-prefix=CHECK-ERROR <%t/err.txt
 // CHECK-ERROR: LeafModule.swiftinterface:7:8: error: no such module 'NotAModule'
@@ -69,7 +69,7 @@
 //
 // RUN: %{python} %S/Inputs/check-is-old.py %t/OtherModule.swiftinterface %t/LeafModule.swiftinterface
 // RUN: %{python} %S/Inputs/check-is-old.py %t/modulecache/OtherModule-*.swiftmodule %t/modulecache/LeafModule-*.swiftmodule
-// RUN: not %target-swift-frontend -disable-implicit-concurrency-module-import -I %t -module-cache-path %t/modulecache -serialize-diagnostics -serialize-diagnostics-path %t/err.dia -emit-module -o %t/TestModule.swiftmodule -module-name TestModule %s
+// RUN: not %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -I %t -module-cache-path %t/modulecache -serialize-diagnostics -serialize-diagnostics-path %t/err.dia -emit-module -o %t/TestModule.swiftmodule -module-name TestModule %s
 // RUN: %{python} %S/Inputs/check-is-old.py %t/modulecache/OtherModule-*.swiftmodule %t/modulecache/LeafModule-*.swiftmodule
 // RUN: c-index-test -read-diagnostics %t/err.dia 2>&1 | %FileCheck %s -check-prefix=CHECK-ERROR
 //
@@ -81,7 +81,7 @@
 // RUN: %{python} %S/Inputs/make-old.py %t/LeafModule.swiftinterface
 // RUN: %{python} %S/Inputs/check-is-old.py %t/OtherModule.swiftinterface %t/LeafModule.swiftinterface
 // RUN: %{python} %S/Inputs/check-is-old.py %t/modulecache/OtherModule-*.swiftmodule %t/modulecache/LeafModule-*.swiftmodule
-// RUN: not %target-swift-frontend -disable-implicit-concurrency-module-import -I %t -module-cache-path %t/modulecache -emit-module -o %t/TestModule.swiftmodule -module-name TestModule %s >%t/err-inline.txt 2>&1
+// RUN: not %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -I %t -module-cache-path %t/modulecache -emit-module -o %t/TestModule.swiftmodule -module-name TestModule %s >%t/err-inline.txt 2>&1
 // RUN: %{python} %S/Inputs/check-is-old.py %t/modulecache/OtherModule-*.swiftmodule %t/modulecache/LeafModule-*.swiftmodule
 // RUN: %FileCheck %s -check-prefix=CHECK-ERROR-INLINE <%t/err-inline.txt
 // CHECK-ERROR-INLINE: LeafModule.swiftinterface:6:33: error: cannot find 'unresolved' in scope
@@ -94,7 +94,7 @@
 //
 // RUN: %{python} %S/Inputs/check-is-old.py %t/OtherModule.swiftinterface %t/LeafModule.swiftinterface
 // RUN: %{python} %S/Inputs/check-is-old.py %t/modulecache/OtherModule-*.swiftmodule %t/modulecache/LeafModule-*.swiftmodule
-// RUN: not %target-swift-frontend -disable-implicit-concurrency-module-import -I %t -module-cache-path %t/modulecache -serialize-diagnostics -serialize-diagnostics-path %t/err-inline.dia -emit-module -o %t/TestModule.swiftmodule -module-name TestModule %s
+// RUN: not %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -I %t -module-cache-path %t/modulecache -serialize-diagnostics -serialize-diagnostics-path %t/err-inline.dia -emit-module -o %t/TestModule.swiftmodule -module-name TestModule %s
 // RUN: %{python} %S/Inputs/check-is-old.py %t/modulecache/OtherModule-*.swiftmodule %t/modulecache/LeafModule-*.swiftmodule
 // RUN: c-index-test -read-diagnostics %t/err-inline.dia 2>&1 | %FileCheck %s -check-prefix=CHECK-ERROR-INLINE
 

test/ModuleInterface/imports-submodule-order.swift

@@ -1,5 +1,5 @@
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -typecheck -emit-module-interface-path - %s -I %S/Inputs/imports-submodule-order/ | %FileCheck %s
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -typecheck -emit-module-interface-path - %s -I %S/Inputs/imports-submodule-order/ -D XY | %FileCheck %s
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -typecheck -emit-module-interface-path - %s -I %S/Inputs/imports-submodule-order/ | %FileCheck %s
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -typecheck -emit-module-interface-path - %s -I %S/Inputs/imports-submodule-order/ -D XY | %FileCheck %s
 
 #if XY
 @_exported import X.Submodule

test/ModuleInterface/imports.swift

@@ -1,7 +1,7 @@
 // RUN: %empty-directory(%t)
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-module -o %t/empty.swiftmodule %S/../Inputs/empty.swift
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-module -o %t/emptyButWithLibraryEvolution.swiftmodule %S/../Inputs/empty.swift -enable-library-evolution
-// RUN: %target-swift-emit-module-interface(%t.swiftinterface) %s %S/Inputs/imports-other.swift -disable-implicit-concurrency-module-import -I %S/Inputs/imports-clang-modules/ -I %t -verify
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module -o %t/empty.swiftmodule %S/../Inputs/empty.swift
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module -o %t/emptyButWithLibraryEvolution.swiftmodule %S/../Inputs/empty.swift -enable-library-evolution
+// RUN: %target-swift-emit-module-interface(%t.swiftinterface) %s %S/Inputs/imports-other.swift -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -I %S/Inputs/imports-clang-modules/ -I %t -verify
 // RUN: %target-swift-typecheck-module-from-interface(%t.swiftinterface) -I %S/Inputs/imports-clang-modules/ -I %t
 // RUN: %FileCheck -implicit-check-not BAD %s < %t.swiftinterface
 

test/Parse/switch.swift

@@ -335,8 +335,7 @@ func f1(x: String, y: Whichever) {
         break
     case Whichever.buzz: // expected-error {{type 'Whichever' has no member 'buzz'}}
         break
-    case Whichever.alias: // expected-error {{expression pattern of type 'Whichever' cannot match values of type 'String'}}
-    // expected-note@-1 {{overloads for '~=' exist with these partially matching parameter lists: (Substring, String)}}
+    case Whichever.alias: // expected-error {{referencing operator function '~=' on 'RegexComponent' requires that 'Whichever' conform to 'RegexComponent'}}
         break
     default:
       break

test/ScanDependencies/can_import_placeholder.swift

@@ -45,5 +45,8 @@ import SomeExternalModule
 // CHECK-NEXT: },
 // CHECK-NEXT: {
 // CHECK-NEXT: "swift": "_Concurrency"
+// CHECK-NEXT: },
+// CHECK-NEXT: {
+// CHECK-NEXT: "swift": "_StringProcessing"
 // CHECK-NEXT: }
 // CHECK-NEXT: ],

test/ScanDependencies/can_import_with_map.swift

@@ -27,6 +27,11 @@
 // RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json
 // RUN: echo "}," >> %/t/inputs/map.json
 // RUN: echo "{" >> %/t/inputs/map.json
+// RUN: echo "\"moduleName\": \"_StringProcessing\"," >> %/t/inputs/map.json
+// RUN: echo "\"modulePath\": \"%/string_processing_module\"," >> %/t/inputs/map.json
+// RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json
+// RUN: echo "}," >> %/t/inputs/map.json
+// RUN: echo "{" >> %/t/inputs/map.json
 // RUN: echo "\"moduleName\": \"Distributed\"," >> %/t/inputs/map.json
 // RUN: echo "\"modulePath\": \"%/distributed_module\"," >> %/t/inputs/map.json
 // RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json

test/ScanDependencies/explicit-framework-irgen.swift

@@ -28,6 +28,11 @@
 // RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json
 // RUN: echo "}," >> %/t/inputs/map.json
 // RUN: echo "{" >> %/t/inputs/map.json
+// RUN: echo "\"moduleName\": \"_StringProcessing\"," >> %/t/inputs/map.json
+// RUN: echo "\"modulePath\": \"%/string_processing_module\"," >> %/t/inputs/map.json
+// RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json
+// RUN: echo "}," >> %/t/inputs/map.json
+// RUN: echo "{" >> %/t/inputs/map.json
 // RUN: echo "\"moduleName\": \"Distributed\"," >> %/t/inputs/map.json
 // RUN: echo "\"modulePath\": \"%/distributed_module\"," >> %/t/inputs/map.json
 // RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json

test/ScanDependencies/explicit-module-map-forwarding-module.swift

@@ -37,6 +37,11 @@
 // RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json
 // RUN: echo "}," >> %/t/inputs/map.json
 // RUN: echo "{" >> %/t/inputs/map.json
+// RUN: echo "\"moduleName\": \"_StringProcessing\"," >> %/t/inputs/map.json
+// RUN: echo "\"modulePath\": \"%/string_processing_module\"," >> %/t/inputs/map.json
+// RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json
+// RUN: echo "}," >> %/t/inputs/map.json
+// RUN: echo "{" >> %/t/inputs/map.json
 // RUN: echo "\"moduleName\": \"Distributed\"," >> %/t/inputs/map.json
 // RUN: echo "\"modulePath\": \"%/distributed_module\"," >> %/t/inputs/map.json
 // RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json

test/ScanDependencies/explicit-module-map.swift

@@ -26,6 +26,11 @@
 // RUN: echo "\"moduleName\": \"_Concurrency\"," >> %/t/inputs/map.json
 // RUN: echo "\"modulePath\": \"%/concurrency_module\"," >> %/t/inputs/map.json
 // RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json
+// RUN: echo "}," >> %/t/inputs/map.json
+// RUN: echo "{" >> %/t/inputs/map.json
+// RUN: echo "\"moduleName\": \"_StringProcessing\"," >> %/t/inputs/map.json
+// RUN: echo "\"modulePath\": \"%/string_processing_module\"," >> %/t/inputs/map.json
+// RUN: echo "\"isFramework\": false" >> %/t/inputs/map.json
 // RUN: echo "}]" >> %/t/inputs/map.json
 
 // RUN: %target-swift-ide-test -print-module-comments -module-to-print=Foo -enable-swiftsourceinfo -source-filename %s -explicit-swift-module-map-file %t/inputs/map.json | %FileCheck %s

test/ScanDependencies/module_deps_cache_reuse.swift

@@ -57,6 +57,9 @@ import SubE
 // CHECK-NEXT:     "swift": "_Concurrency"
 // CHECK-NEXT:   },
 // CHECK-NEXT:   {
+// CHECK-NEXT:     "swift": "_StringProcessing"
+// CHECK-NEXT:   },
+// CHECK-NEXT:   {
 // CHECK-NEXT:     "swift": "_cross_import_E"
 // CHECK-NEXT:   }
 // CHECK-NEXT: ],

test/ScanDependencies/module_deps_cross_import_overlay.swift

@@ -34,6 +34,9 @@ import SubEWrapper
 // CHECK-NEXT:   "swift": "_Concurrency"
 // CHECK-NEXT: },
 // CHECK-NEXT: {
+// CHECK-NEXT:   "swift": "_StringProcessing"
+// CHECK-NEXT: },
+// CHECK-NEXT: {
 // CHECK-NEXT:   "swift": "_cross_import_E"
 // CHECK-NEXT: }
 // CHECK-NEXT: ],

test/ScanDependencies/module_deps_external.swift

@@ -57,6 +57,9 @@ import SomeExternalModule
 // CHECK-NEXT: },
 // CHECK-NEXT: {
 // CHECK-NEXT: "swift": "_Concurrency"
+// CHECK-NEXT: },
+// CHECK-NEXT: {
+// CHECK-NEXT: "swift": "_StringProcessing"
 // CHECK-NEXT: }
 // CHECK-NEXT: ],
 

test/ScanDependencies/module_framework.swift

@@ -24,6 +24,9 @@ import CryptoKit
 // CHECK-NEXT: },
 // CHECK-NEXT: {
 // CHECK-NEXT: "swift": "_Concurrency"
+// CHECK-NEXT: },
+// CHECK-NEXT: {
+// CHECK-NEXT: "swift": "_StringProcessing"
 // CHECK-NEXT: }
 // CHECK-NEXT: ],
 

test/ScanDependencies/prescan_deps.swift

@@ -21,4 +21,5 @@ import SubE
 // CHECK-NEXT:  "Swift",
 // CHECK-NEXT:  "SwiftOnoneSupport",
 // CHECK-NEXT:  "_Concurrency"
+// CHECK-NEXT:  "_StringProcessing"
 // CHECK-NEXT: ]

test/Serialization/autolinking-inlinable-inferred.swift

@@ -1,21 +1,21 @@
 // RUN: %empty-directory(%t)
 
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-module %S/Inputs/autolinking_public.swift -disable-implicit-concurrency-module-import -emit-module-path %t/autolinking_public.swiftmodule -module-link-name autolinking_public -swift-version 4
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-module %S/Inputs/autolinking_other.swift -disable-implicit-concurrency-module-import -emit-module-path %t/autolinking_other.swiftmodule -module-link-name autolinking_other -swift-version 4
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-module %S/Inputs/autolinking_private.swift -disable-implicit-concurrency-module-import -emit-module-path %t/autolinking_private.swiftmodule -module-link-name autolinking_private -I %t -swift-version 4
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-module %S/Inputs/autolinking_other2.swift -disable-implicit-concurrency-module-import -emit-module-path %t/autolinking_other2.swiftmodule -module-link-name autolinking_other2 -swift-version 4
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-module %S/Inputs/autolinking_indirect.swift -disable-implicit-concurrency-module-import -emit-module-path %t/autolinking_indirect.swiftmodule -module-link-name autolinking_indirect -I %t -swift-version 4
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-module %S/Inputs/autolinking_implementation_only.swift -disable-implicit-concurrency-module-import -emit-module-path %t/autolinking_implementation_only.swiftmodule -module-link-name autolinking_implementation_only_BAD -I %t -swift-version 4
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module %S/Inputs/autolinking_public.swift -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module-path %t/autolinking_public.swiftmodule -module-link-name autolinking_public -swift-version 4
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module %S/Inputs/autolinking_other.swift -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module-path %t/autolinking_other.swiftmodule -module-link-name autolinking_other -swift-version 4
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module %S/Inputs/autolinking_private.swift -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module-path %t/autolinking_private.swiftmodule -module-link-name autolinking_private -I %t -swift-version 4
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module %S/Inputs/autolinking_other2.swift -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module-path %t/autolinking_other2.swiftmodule -module-link-name autolinking_other2 -swift-version 4
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module %S/Inputs/autolinking_indirect.swift -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module-path %t/autolinking_indirect.swiftmodule -module-link-name autolinking_indirect -I %t -swift-version 4
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module %S/Inputs/autolinking_implementation_only.swift -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module-path %t/autolinking_implementation_only.swiftmodule -module-link-name autolinking_implementation_only_BAD -I %t -swift-version 4
 
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-module %S/Inputs/autolinking_module_inferred.swift -disable-implicit-concurrency-module-import -emit-module-path %t/autolinking_module_inferred.swiftmodule -module-link-name autolinking_module_inferred -I %t -swift-version 4
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module %S/Inputs/autolinking_module_inferred.swift -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module-path %t/autolinking_module_inferred.swiftmodule -module-link-name autolinking_module_inferred -I %t -swift-version 4
 
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-ir %s -I %t -swift-version 4 -enable-objc-interop -D NORMAL_IMPORT | %FileCheck -check-prefix CHECK -check-prefix CHECK-NORMAL -implicit-check-not BAD %s
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-ir %s -I %t -swift-version 4 -enable-objc-interop -D IMPLEMENTATION_ONLY_IMPORT | %FileCheck -check-prefix CHECK -check-prefix CHECK-IMPL_ONLY -implicit-check-not BAD %s
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-ir %s -I %t -swift-version 4 -enable-objc-interop -D NORMAL_IMPORT | %FileCheck -check-prefix CHECK -check-prefix CHECK-NORMAL -implicit-check-not BAD %s
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-ir %s -I %t -swift-version 4 -enable-objc-interop -D IMPLEMENTATION_ONLY_IMPORT | %FileCheck -check-prefix CHECK -check-prefix CHECK-IMPL_ONLY -implicit-check-not BAD %s
 
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-ir %s -I %t -swift-version 4 -enable-objc-interop -D NORMAL_AND_IMPLEMENTATION_ONLY | %FileCheck -check-prefix CHECK -check-prefix CHECK-NORMAL -implicit-check-not BAD %s
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-ir %s -I %t -swift-version 4 -enable-objc-interop -D IMPLEMENTATION_ONLY_AND_NORMAL | %FileCheck -check-prefix CHECK -check-prefix CHECK-NORMAL -implicit-check-not BAD %s
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-ir %s -I %t -swift-version 4 -enable-objc-interop -D EXPORTED_AND_IMPLEMENTATION_ONLY | %FileCheck -check-prefix CHECK -check-prefix CHECK-NORMAL -implicit-check-not BAD %s
-// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -emit-ir %s -I %t -swift-version 4 -enable-objc-interop -D IMPLEMENTATION_ONLY_AND_EXPORTED | %FileCheck -check-prefix CHECK -check-prefix CHECK-NORMAL -implicit-check-not BAD %s
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-ir %s -I %t -swift-version 4 -enable-objc-interop -D NORMAL_AND_IMPLEMENTATION_ONLY | %FileCheck -check-prefix CHECK -check-prefix CHECK-NORMAL -implicit-check-not BAD %s
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-ir %s -I %t -swift-version 4 -enable-objc-interop -D IMPLEMENTATION_ONLY_AND_NORMAL | %FileCheck -check-prefix CHECK -check-prefix CHECK-NORMAL -implicit-check-not BAD %s
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-ir %s -I %t -swift-version 4 -enable-objc-interop -D EXPORTED_AND_IMPLEMENTATION_ONLY | %FileCheck -check-prefix CHECK -check-prefix CHECK-NORMAL -implicit-check-not BAD %s
+// RUN: %target-swift-frontend -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-ir %s -I %t -swift-version 4 -enable-objc-interop -D IMPLEMENTATION_ONLY_AND_EXPORTED | %FileCheck -check-prefix CHECK -check-prefix CHECK-NORMAL -implicit-check-not BAD %s
 
 // Linux uses a different autolinking mechanism, based on
 // swift-autolink-extract. This file tests the Darwin mechanism.

test/Serialization/runtime-import-from-sdk.swift

@@ -29,14 +29,14 @@
 // we should fall back to the SDK.
 
 // RUN: %empty-directory(%t/mcp)
-// RUN: %target-swift-frontend(mock-sdk: -sdk %t/good-sdk) -resource-dir %t/empty-toolchain/usr/lib/swift -module-cache-path %t/mcp -typecheck -verify -disable-implicit-concurrency-module-import %s
+// RUN: %target-swift-frontend(mock-sdk: -sdk %t/good-sdk) -resource-dir %t/empty-toolchain/usr/lib/swift -module-cache-path %t/mcp -typecheck -verify -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import %s
 
 // If the compiler's resource directory *does* contain a runtime swiftmodule, we
 // should *not* use the one in the SDK. (We assume that the resource directory
 // built with this compiler does contain a standard library.)
 
 // RUN: %empty-directory(%t/mcp)
-// RUN: %target-swift-frontend(mock-sdk: -sdk %t/bad-sdk) -module-cache-path %t/mcp -typecheck -verify -disable-implicit-concurrency-module-import %s
+// RUN: %target-swift-frontend(mock-sdk: -sdk %t/bad-sdk) -module-cache-path %t/mcp -typecheck -verify -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import %s
 
 // If neither the resource directory nor the SDK contains a runtime swiftmodule,
 // loading should fail. This just proves that we aren't getting runtime imports
@@ -51,7 +51,7 @@
 // REQUIRES: objc_interop
 
 // RUN: %empty-directory(%t/mcp)
-// RUN: not %target-swift-frontend(mock-sdk: -sdk %t/bad-sdk) -resource-dir %t/empty-toolchain/usr/lib/swift -module-cache-path %t/mcp -typecheck %s -dump-clang-diagnostics -disable-implicit-concurrency-module-import 2>&1 | %FileCheck --check-prefix CHECK-EMPTY %s
+// RUN: not %target-swift-frontend(mock-sdk: -sdk %t/bad-sdk) -resource-dir %t/empty-toolchain/usr/lib/swift -module-cache-path %t/mcp -typecheck %s -dump-clang-diagnostics -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import 2>&1 | %FileCheck --check-prefix CHECK-EMPTY %s
 // CHECK-EMPTY-NOT: '-isystem' '{{.*}}/bad-sdk/usr/lib/swift/shims'
 // CHECK-EMPTY: error: could not find module 'Swift' for target '{{.*}}'; found: garbage-garbage-garbage, at: {{.*}}/Swift.swiftmodule
 
@@ -59,7 +59,7 @@
 // *does* add a -I flag to look in the SDK.
 
 // RUN: %empty-directory(%t/mcp)
-// RUN: not %target-swift-frontend(mock-sdk: -sdk %t/bad-sdk) -resource-dir %t/really-empty-toolchain/usr/lib/swift -module-cache-path %t/mcp -typecheck %s -dump-clang-diagnostics -disable-implicit-concurrency-module-import 2>&1 | %FileCheck --check-prefix CHECK-REALLY-EMPTY %s
+// RUN: not %target-swift-frontend(mock-sdk: -sdk %t/bad-sdk) -resource-dir %t/really-empty-toolchain/usr/lib/swift -module-cache-path %t/mcp -typecheck %s -dump-clang-diagnostics -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import 2>&1 | %FileCheck --check-prefix CHECK-REALLY-EMPTY %s
 // CHECK-REALLY-EMPTY: '-isystem' '{{.*}}/bad-sdk/usr/lib/swift/shims'
 // CHECK-REALLY-EMPTY: error: could not find module 'Swift' for target '{{.*}}'; found: garbage-garbage-garbage, at: {{.*}}/Swift.swiftmodule
 

test/SourceKit/CursorInfo/cursor_generated_interface.swift

@@ -6,7 +6,7 @@
 
 // RUN: %target-swift-frontend -module-name LibB -emit-module -emit-module-path %t/mods/LibB.swiftmodule -emit-module-source-info-path %t/mods/LibB.swiftsourceinfo %t/libB.swift
 // RUN: %target-swift-frontend -module-name LibC -emit-module -emit-module-path %t/mods/LibC.swiftmodule %t/libC.swift
-// RUN: %target-swift-frontend -module-name LibA -emit-module -emit-module-path %t/frameworks/LibA.framework/Modules/LibA.swiftmodule/%target-swiftmodule-name -import-underlying-module -disable-implicit-concurrency-module-import -F %t/frameworks -I %t/mods %t/libA.swift
+// RUN: %target-swift-frontend -module-name LibA -emit-module -emit-module-path %t/frameworks/LibA.framework/Modules/LibA.swiftmodule/%target-swiftmodule-name -import-underlying-module -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -F %t/frameworks -I %t/mods %t/libA.swift
 // RUN: %swift-ide-test -print-module -print-interface -source-filename dummy -module-to-print LibA -F %t/frameworks -target %target-triple &> %t/generated.swift
 
 // Check that we always include module name, regardless of whether we have

test/SourceKit/DocSupport/doc_internal_closure_label.swift

@@ -1,15 +1,15 @@
 // RUN: %empty-directory(%t)
 // RUN: %empty-directory(%t.module-cache)
 //
-// RUN: %target-swift-frontend -typecheck -disable-implicit-concurrency-module-import -emit-module-interface-path %t/label.swiftinterface -enable-library-evolution -module-cache-path %t.module-cache %s
+// RUN: %target-swift-frontend -typecheck -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -emit-module-interface-path %t/label.swiftinterface -enable-library-evolution -module-cache-path %t.module-cache %s
 // RUN: %FileCheck --check-prefix=SWIFT_INTERFACE %s < %t/label.swiftinterface
-// RUN: %sourcekitd-test -req=doc-info -module label -- -Xfrontend -disable-implicit-concurrency-module-import -I %t -target %target-triple -module-cache-path %t.module-cache > %t.response
+// RUN: %sourcekitd-test -req=doc-info -module label -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import -I %t -target %target-triple -module-cache-path %t.module-cache > %t.response
 // RUN: %diff -u %s.response %t.response
 //
 // RUN: %empty-directory(%t)
 // RUN: %empty-directory(%t.module-cache)
-// RUN: %target-swift-frontend -emit-module %s -disable-implicit-concurrency-module-import -module-name label -emit-module-path %t/label.swiftmodule -module-cache-path %t.module-cache
-// RUN: %sourcekitd-test -req=doc-info -module label -- -Xfrontend -disable-implicit-concurrency-module-import -I %t -target %target-triple -module-cache-path %t.module-cache> %t.response
+// RUN: %target-swift-frontend -emit-module %s -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -module-name label -emit-module-path %t/label.swiftmodule -module-cache-path %t.module-cache
+// RUN: %sourcekitd-test -req=doc-info -module label -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import -I %t -target %target-triple -module-cache-path %t.module-cache> %t.response
 // RUN: %diff -u %s.response %t.response
 
 public func foo(_ callback: (_ myInternalParam: Int) -> Void) {}

test/SourceKit/DocSupport/doc_swift_module.swift

@@ -1,4 +1,4 @@
 // RUN: %empty-directory(%t.mod)
-// RUN: %swift -emit-module -o %t.mod/cake.swiftmodule %S/Inputs/cake.swift -parse-as-library  -enable-objc-interop -emit-module-doc-path %t.mod/cake.swiftdoc -disable-implicit-concurrency-module-import
-// RUN: %sourcekitd-test -req=doc-info -module cake -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.mod > %t.response
+// RUN: %swift -emit-module -o %t.mod/cake.swiftmodule %S/Inputs/cake.swift -parse-as-library  -enable-objc-interop -emit-module-doc-path %t.mod/cake.swiftdoc -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import
+// RUN: %sourcekitd-test -req=doc-info -module cake -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import -I %t.mod > %t.response
 // RUN: %diff -u %s.response %t.response

test/SourceKit/DocSupport/doc_swift_module1.swift

@@ -1,4 +1,4 @@
 // RUN: %empty-directory(%t.mod)
-// RUN: %swift -emit-module -o %t.mod/cake1.swiftmodule %S/Inputs/cake1.swift -parse-as-library
-// RUN: %sourcekitd-test -req=doc-info -module cake1 -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.mod > %t.response
+// RUN: %swift -emit-module -o %t.mod/cake1.swiftmodule %S/Inputs/cake1.swift -disable-implicit-string-processing-module-import -parse-as-library
+// RUN: %sourcekitd-test -req=doc-info -module cake1 -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.mod > %t.response
 // RUN: %diff -u %s.response %t.response

test/SourceKit/DocSupport/doc_swift_module_class_extension.swift

@@ -1,6 +1,6 @@
 // RUN: %empty-directory(%t.mod)
-// RUN: %swift -emit-module -o %t.mod/module_with_class_extension.swiftmodule %S/Inputs/module_with_class_extension.swift -parse-as-library
-// RUN: %sourcekitd-test -req=doc-info -module module_with_class_extension -- -Xfrontend -disable-implicit-concurrency-module-import -I %t.mod > %t.response
+// RUN: %swift -emit-module -o %t.mod/module_with_class_extension.swiftmodule %S/Inputs/module_with_class_extension.swift -disable-implicit-string-processing-module-import -parse-as-library
+// RUN: %sourcekitd-test -req=doc-info -module module_with_class_extension -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import -I %t.mod > %t.response
 // RUN: %diff -u %s.response %t.response
 
 // rdar://76868074: Make sure we print the extensions for C.

test/SourceKit/DocSupport/doc_swift_module_cross_import.swift

@@ -8,7 +8,7 @@
 
 // Set up a cross-import module with doc comments and check the synthesized comments don't appear in the fully_annotated_decl entries.
 //
-// RUN: %target-swift-frontend -emit-module-path %t.mod/_OtherCAdditions.swiftmodule -emit-module-doc-path %t.mod/_OtherCAdditions.swiftdoc -module-cache-path %t.mod/mcp -I %S/../Inputs/CrossImport %S/../Inputs/CrossImport/_OtherCAdditions.swift -parse-as-library -enable-cross-import-overlays -disable-implicit-concurrency-module-import
-// RUN: %sourcekitd-test -req=doc-info -module Other -- -Xfrontend -disable-implicit-concurrency-module-import  -target %target-triple -I %S/../Inputs/CrossImport -I %t.mod/ -module-cache-path %t.mod/mcp > %t.response
+// RUN: %target-swift-frontend -emit-module-path %t.mod/_OtherCAdditions.swiftmodule -emit-module-doc-path %t.mod/_OtherCAdditions.swiftdoc -module-cache-path %t.mod/mcp -I %S/../Inputs/CrossImport %S/../Inputs/CrossImport/_OtherCAdditions.swift -parse-as-library -enable-cross-import-overlays -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import
+// RUN: %sourcekitd-test -req=doc-info -module Other -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -target %target-triple -I %S/../Inputs/CrossImport -I %t.mod/ -module-cache-path %t.mod/mcp > %t.response
 // RUN: %diff -u %s.Other.response %t.response
 

test/SourceKit/Indexing/index.swift

@@ -1,4 +1,4 @@
-// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia -Xfrontend -disable-implicit-concurrency-module-import %s | %sed_clean | sed -e 's/key.usr: \".*\"/key.usr: <usr>/g' > %t.response
+// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import %s | %sed_clean | sed -e 's/key.usr: \".*\"/key.usr: <usr>/g' > %t.response
 // RUN: %diff -u %s.response %t.response
 
 var globV: Int

test/SourceKit/Indexing/index_bad_modulename.swift

@@ -1,8 +1,8 @@
 // RUN: %empty-directory(%t)
 // RUN: %build-clang-importer-objc-overlays
-// RUN: %sourcekitd-test -req=index %s -- %s -module-name Swift -target %target-triple %clang-importer-sdk-nosource -I %t | %sed_clean > %t.response1
+// RUN: %sourcekitd-test -req=index %s -- %s -Xfrontend -disable-implicit-string-processing-module-import -module-name Swift -target %target-triple %clang-importer-sdk-nosource -I %t | %sed_clean > %t.response1
 // RUN: %diff -u %s.response %t.response1
-// RUN: %sourcekitd-test -req=index %s -- %s -module-name 12345 -target %target-triple %clang-importer-sdk-nosource -I %t | %sed_clean > %t.response2
+// RUN: %sourcekitd-test -req=index %s -- %s -Xfrontend -disable-implicit-string-processing-module-import -module-name 12345 -target %target-triple %clang-importer-sdk-nosource -I %t | %sed_clean > %t.response2
 // RUN: %diff -u %s.response %t.response2
 
 import ObjectiveC

test/SourceKit/Indexing/index_bad_modulename.swift.response

@@ -57,6 +57,20 @@
           key.name: "_Concurrency",
           key.filepath: _Concurrency.swiftmodule,
           key.is_system: 1
+        },
+        {
+          key.kind: source.lang.swift.import.module.swift,
+          key.name: "_StringProcessing",
+          key.filepath: _StringProcessing.swiftmodule,
+          key.is_system: 1,
+          key.dependencies: [
+            {
+              key.kind: source.lang.swift.import.module.swift,
+              key.name: "Swift",
+              key.filepath: Swift.swiftmodule,
+              key.is_system: 1
+            }
+          ]
         }
       ]
     }

test/SourceKit/Indexing/index_big_array.swift

@@ -1,2 +1,2 @@
-// RUN: %sourcekitd-test -req=index %S/../Inputs/big_array.swift -- %S/../Inputs/big_array.swift -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.response
+// RUN: %sourcekitd-test -req=index %S/../Inputs/big_array.swift -- %S/../Inputs/big_array.swift -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.response
 // RUN: %diff -u %s.response %t.response

test/SourceKit/Indexing/index_effective_access_level.swift

@@ -1,8 +1,8 @@
 // RUN: %empty-directory(%t)
-// RUN: %swift -emit-module -o %t/Exported.swiftmodule %S/Inputs/explicit-access/Exported.swift -disable-implicit-concurrency-module-import
-// RUN: %swift -emit-module -o %t/Module.swiftmodule %S/Inputs/explicit-access/Module.swift -I %t -disable-implicit-concurrency-module-import
+// RUN: %swift -emit-module -o %t/Exported.swiftmodule %S/Inputs/explicit-access/Exported.swift -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import
+// RUN: %swift -emit-module -o %t/Module.swiftmodule %S/Inputs/explicit-access/Module.swift -I %t -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import
 
-// RUN: %sourcekitd-test -req=index %s -- -I %t %s -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.response
+// RUN: %sourcekitd-test -req=index %s -- -I %t %s -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.response
 // RUN: %diff -u %s.response %t.response
 
 public enum PublicEnum {

test/SourceKit/Indexing/index_enum_case.swift

@@ -1,4 +1,4 @@
-// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.response
+// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.response
 // RUN: %diff -u %s.response %t.response
 
 public enum E {

test/SourceKit/Indexing/index_forbid_typecheck.swift

@@ -1,2 +1,2 @@
-// RUN: %sourcekitd-test -req=index %S/../Inputs/forbid_typecheck_primary.swift -- -Xfrontend -debug-forbid-typecheck-prefix -Xfrontend NOTYPECHECK %S/../Inputs/forbid_typecheck_2.swift %S/../Inputs/forbid_typecheck_primary.swift -module-name forbid_typecheck -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.response
+// RUN: %sourcekitd-test -req=index %S/../Inputs/forbid_typecheck_primary.swift -- -Xfrontend -debug-forbid-typecheck-prefix -Xfrontend NOTYPECHECK %S/../Inputs/forbid_typecheck_2.swift %S/../Inputs/forbid_typecheck_primary.swift -module-name forbid_typecheck -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.response
 // RUN: %diff -u %s.response %t.response

test/SourceKit/Indexing/index_func_import.swift

@@ -1,7 +1,7 @@
 // RUN: %empty-directory(%t)
-// RUN: %swift -emit-module -o %t/test_module.swiftmodule %S/Inputs/test_module.swift -disable-implicit-concurrency-module-import
+// RUN: %swift -emit-module -o %t/test_module.swiftmodule %S/Inputs/test_module.swift -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import
 
-// RUN: %sourcekitd-test -req=index %s -- %s -I %t -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.response
+// RUN: %sourcekitd-test -req=index %s -- %s -I %t -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.response
 // RUN: %diff -u %s.response %t.response
 
 import func test_module.globalFunc

test/SourceKit/Indexing/index_implicit_vis.swift

@@ -1,4 +1,4 @@
-// RUN: %sourcekitd-test -req=index %S/Inputs/implicit-vis/a.swift -- %S/Inputs/implicit-vis/a.swift %S/Inputs/implicit-vis/b.swift -o implicit_vis.o -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.a.response
-// RUN: %sourcekitd-test -req=index %S/Inputs/implicit-vis/b.swift -- %S/Inputs/implicit-vis/a.swift %S/Inputs/implicit-vis/b.swift -o implicit_vis.o -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.b.response
+// RUN: %sourcekitd-test -req=index %S/Inputs/implicit-vis/a.swift -- %S/Inputs/implicit-vis/a.swift %S/Inputs/implicit-vis/b.swift -o implicit_vis.o -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.a.response
+// RUN: %sourcekitd-test -req=index %S/Inputs/implicit-vis/b.swift -- %S/Inputs/implicit-vis/a.swift %S/Inputs/implicit-vis/b.swift -o implicit_vis.o -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.b.response
 // RUN: %diff -u %S/Inputs/implicit-vis/a.index.response %t.a.response
 // RUN: %diff -u %S/Inputs/implicit-vis/b.index.response %t.b.response

test/SourceKit/Indexing/index_is_test_candidate.swift

@@ -1,4 +1,4 @@
-// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.response
+// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.response
 // RUN: %diff -u %s.response %t.response
 
 // This test verifies that, when Objective-C interop is disabled, private

test/SourceKit/Indexing/index_is_test_candidate_objc.swift

@@ -1,4 +1,4 @@
-// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.response
+// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.response
 // RUN: %diff -u %s.response %t.response
 
 // This test verifies that, when Objective-C interop is enabled, all "test

test/SourceKit/Indexing/index_objcMembers.swift

@@ -1,4 +1,4 @@
-// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.response
+// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.response
 // RUN: %diff -u %s.response %t.response
 // REQUIRES: objc_interop
 

test/SourceKit/Indexing/index_operators.swift

@@ -1,4 +1,4 @@
-// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.response
+// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.response
 // RUN: %diff -u %s.response %t.response
 
 class ClassA {

test/SourceKit/Indexing/index_with_swift_module.swift

@@ -1,9 +1,9 @@
 // RUN: %empty-directory(%t)
-// RUN: %swift -emit-module -o %t/test_module.swiftmodule %S/Inputs/test_module.swift -disable-implicit-concurrency-module-import
+// RUN: %swift -emit-module -o %t/test_module.swiftmodule %S/Inputs/test_module.swift -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import
 
-// RUN: %sourcekitd-test -req=index %s -- %s -I %t -Xfrontend -disable-implicit-concurrency-module-import | %FileCheck %s
+// RUN: %sourcekitd-test -req=index %s -- %s -I %t -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %FileCheck %s
 
-// RUN: %sourcekitd-test -req=index %t/test_module.swiftmodule -- -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.response
+// RUN: %sourcekitd-test -req=index %t/test_module.swiftmodule -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.response
 // RUN: %diff -u %S/Inputs/test_module.index.response %t.response
 
 import test_module

test/SourceKit/Indexing/rdar_21602898.swift

@@ -1,4 +1,4 @@
-// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.response
+// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.response
 // RUN: %diff -u %s.response %t.response
 
 protocol P {}

test/SourceKit/Indexing/sr_3815.swift

@@ -1,4 +1,4 @@
-// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import | %sed_clean > %t.response
+// RUN: %sourcekitd-test -req=index %s -- -Xfrontend -serialize-diagnostics-path -Xfrontend %t.dia %s -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import | %sed_clean > %t.response
 // RUN: %diff -u %s.response %t.response
 
 protocol P {

test/SourceKit/InterfaceGen/gen_clang_module.swift

@@ -11,32 +11,32 @@ var x: FooClassBase
 // RUN: %empty-directory(%t)
 // RUN: %build-clang-importer-objc-overlays
 //
-// RUN: %target-swift-frontend -emit-module -o %t.overlays -F %S/../Inputs/libIDE-mock-sdk %S/Inputs/Foo.swift -disable-implicit-concurrency-module-import
+// RUN: %target-swift-frontend -emit-module -o %t.overlays -F %S/../Inputs/libIDE-mock-sdk %S/Inputs/Foo.swift -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import
 //
-// RUN: %sourcekitd-test -req=interface-gen -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
+// RUN: %sourcekitd-test -req=interface-gen -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource -I %t > %t.response
 // RUN: %diff -u %s.response %t.response
 
-// RUN: %sourcekitd-test -req=interface-gen -module Foo.FooSub -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
+// RUN: %sourcekitd-test -req=interface-gen -module Foo.FooSub -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource -I %t > %t.sub.response
 // RUN: %diff -u %s.sub.response %t.sub.response
 
-// RUN: %sourcekitd-test -req=interface-gen -module FooHelper -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
+// RUN: %sourcekitd-test -req=interface-gen -module FooHelper -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource -I %t > %t.helper.response
 // RUN: %diff -u %s.helper.response %t.helper.response
 
-// RUN: %sourcekitd-test -req=interface-gen -module FooHelper.FooHelperExplicit -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.overlays \
+// RUN: %sourcekitd-test -req=interface-gen -module FooHelper.FooHelperExplicit -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.overlays \
 // RUN:         -F %S/../Inputs/libIDE-mock-sdk  -target %target-triple %clang-importer-sdk-nosource -I %t > %t.helper.explicit.response
 // RUN: %diff -u %s.helper.explicit.response %t.helper.explicit.response
 
-// RUN: %sourcekitd-test -req=interface-gen-open -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
+// RUN: %sourcekitd-test -req=interface-gen-open -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource -I %t \
 // RUN:      == -req=cursor -pos=204:67 | %FileCheck -check-prefix=CHECK1 %s
 // The cursor points to 'FooClassBase' inside the list of base classes, see 'gen_clang_module.swift.response'
 
-// RUN: %sourcekitd-test -req=interface-gen-open -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
+// RUN: %sourcekitd-test -req=interface-gen-open -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource -I %t \
-// RUN:   == -req=cursor -pos=3:11 %s -- -Xfrontend -disable-implicit-concurrency-module-import  %s -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
+// RUN:   == -req=cursor -pos=3:11 %s -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  %s -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource -I %t | %FileCheck -check-prefix=CHECK1 %s
 
 // CHECK1: source.lang.swift.ref.class ({{.*}}Foo.framework/Headers/Foo.h:147:12-147:24)
@@ -45,7 +45,7 @@ var x: FooClassBase
 // CHECK1: Foo{{$}}
 // CHECK1-NEXT: /<interface-gen>
 
-// RUN: %sourcekitd-test -req=interface-gen-open -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
+// RUN: %sourcekitd-test -req=interface-gen-open -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource -I %t \
 // RUN:      == -req=cursor -pos=231:20 | %FileCheck -check-prefix=CHECK2 %s
 // The cursor points inside the interface, see 'gen_clang_module.swift.response'
@@ -56,22 +56,22 @@ var x: FooClassBase
 // CHECK2: Foo{{$}}
 // CHECK2-NEXT: /<interface-gen>
 
-// RUN: %sourcekitd-test -req=interface-gen-open -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
+// RUN: %sourcekitd-test -req=interface-gen-open -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource -I %t \
 // RUN:      == -req=find-usr -usr "c:objc(cs)FooClassDerived(im)fooInstanceFunc0" | %FileCheck -check-prefix=CHECK-USR %s
 // The returned line:col points inside the interface, see 'gen_clang_module.swift.response'
 
 // CHECK-USR: (231:15-231:33)
 
-// RUN: %sourcekitd-test -req=interface-gen-open -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
+// RUN: %sourcekitd-test -req=interface-gen-open -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource -I %t \
-// RUN:   == -req=find-interface -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import  %s -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
+// RUN:   == -req=find-interface -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  %s -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource -I %t | %FileCheck -check-prefix=CHECK-IFACE %s
 
 // CHECK-IFACE: DOC: (/<interface-gen>)
 // CHECK-IFACE: ARGS: [-target {{.*}}-{{.*}} -sdk {{.*}} -F {{.*}}/libIDE-mock-sdk -I {{.*}}.overlays {{.*}} -module-cache-path {{.*}} ]
 
-// RUN: %sourcekitd-test -req=interface-gen-open -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
+// RUN: %sourcekitd-test -req=interface-gen-open -module Foo -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.overlays -F %S/../Inputs/libIDE-mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource -I %t \
 // RUN:      == -req=cursor -pos=1:8 == -req=cursor -pos=1:12 \
 // RUN:      == -req=cursor -pos=2:8 | %FileCheck -check-prefix=CHECK-IMPORT %s
@@ -87,9 +87,9 @@ var x: FooClassBase
 // CHECK-IMPORT-NEXT: FooHelper{{$}}
 // CHECK-IMPORT-NEXT: FooHelper{{$}}
 
-// RUN: %sourcekitd-test -req=interface-gen -module APINotesTests -- -Xfrontend -disable-implicit-concurrency-module-import  -swift-version 4 -F %S/Inputs/mock-sdk \
+// RUN: %sourcekitd-test -req=interface-gen -module APINotesTests -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -swift-version 4 -F %S/Inputs/mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource > %t.apinotes_swift3.response
 // RUN: %diff -u %s.apinotes_swift3.response %t.apinotes_swift3.response
-// RUN: %sourcekitd-test -req=interface-gen -module APINotesTests -- -Xfrontend -disable-implicit-concurrency-module-import  -swift-version 5 -F %S/Inputs/mock-sdk \
+// RUN: %sourcekitd-test -req=interface-gen -module APINotesTests -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -swift-version 5 -F %S/Inputs/mock-sdk \
 // RUN:         -target %target-triple %clang-importer-sdk-nosource > %t.apinotes_swift4.response
 // RUN: %diff -u %s.apinotes_swift4.response %t.apinotes_swift4.response

test/SourceKit/InterfaceGen/gen_swift_module.swift

@@ -6,16 +6,16 @@ func f(s : inout [Int]) {
 
 // RUN: %empty-directory(%t.mod)
 // RUN: %empty-directory(%t.mod/mcp)
-// RUN: %swift -emit-module -o %t.mod/swift_mod.swiftmodule %S/Inputs/swift_mod.swift -parse-as-library -disable-implicit-concurrency-module-import
-// RUN: %sourcekitd-test -req=interface-gen -module swift_mod -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.mod > %t.response
+// RUN: %swift -emit-module -o %t.mod/swift_mod.swiftmodule %S/Inputs/swift_mod.swift -parse-as-library -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import
+// RUN: %sourcekitd-test -req=interface-gen -module swift_mod -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.mod > %t.response
 // RUN: %diff -u %s.response %t.response
 
-// RUN: %sourcekitd-test -req=module-groups -module swift_mod -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.mod | %FileCheck -check-prefix=GROUP-EMPTY %s
+// RUN: %sourcekitd-test -req=module-groups -module swift_mod -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.mod | %FileCheck -check-prefix=GROUP-EMPTY %s
 // GROUP-EMPTY: <GROUPS>
 // GROUP-EMPTY-NEXT: <\GROUPS>
 
 // RUN: %swift -emit-module -o %t.mod/swift_mod_syn.swiftmodule %S/Inputs/swift_mod_syn.swift -parse-as-library -disable-implicit-concurrency-module-import
-// RUN: %sourcekitd-test -req=interface-gen-open -module swift_mod_syn -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.mod == -req=cursor -pos=4:7 %s -- -Xfrontend -disable-implicit-concurrency-module-import  %s -I %t.mod | %FileCheck -check-prefix=SYNTHESIZED-USR1 %s
+// RUN: %sourcekitd-test -req=interface-gen-open -module swift_mod_syn -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.mod == -req=cursor -pos=4:7 %s -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  %s -I %t.mod | %FileCheck -check-prefix=SYNTHESIZED-USR1 %s
 // SYNTHESIZED-USR1: s:SMsSkRzSL7ElementSTRpzrlE4sortyyF::SYNTHESIZED::s:Sa
 
 // RUN: %sourcekitd-test -req=interface-gen-open -module Swift -synthesized-extension \
@@ -30,6 +30,6 @@ func f(s : inout [Int]) {
 // Test we can generate the interface of a module loaded via a .swiftinterface file correctly
 
 // RUN: %empty-directory(%t.mod)
-// RUN: %swift -emit-module -o /dev/null -emit-module-interface-path %t.mod/swift_mod.swiftinterface -O %S/Inputs/swift_mod.swift -parse-as-library -disable-implicit-concurrency-module-import
-// RUN: %sourcekitd-test -req=interface-gen -module swift_mod -- -Xfrontend -disable-implicit-concurrency-module-import  -I %t.mod -module-cache-path %t.mod/mcp > %t.response
+// RUN: %swift -emit-module -o /dev/null -emit-module-interface-path %t.mod/swift_mod.swiftinterface -O %S/Inputs/swift_mod.swift -parse-as-library -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import
+// RUN: %sourcekitd-test -req=interface-gen -module swift_mod -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %t.mod -module-cache-path %t.mod/mcp > %t.response
 // RUN: %diff -u %s.from_swiftinterface.response %t.response

test/SourceKit/InterfaceGen/gen_swift_module_cross_import.swift

@@ -3,13 +3,13 @@
 
 // Check the interface shows the decls from each of A's cross-import overlays.
 //
-// RUN: %sourcekitd-test -req=interface-gen -module A -- -Xfrontend -disable-implicit-concurrency-module-import  -I %S/../Inputs/CrossImport -module-cache-path %t.mod/mcp > %t.response
+// RUN: %sourcekitd-test -req=interface-gen -module A -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %S/../Inputs/CrossImport -module-cache-path %t.mod/mcp > %t.response
 // RUN: %diff -u %s.A.response %t.response
 
 // Make sure cursor info within the generated interface of A on one of the
 // decls originally from a cross-import decls shows 'A' as the parent module.
 //
-// RUN: %sourcekitd-test -req=interface-gen-open -module A -- -Xfrontend -disable-implicit-concurrency-module-import  -I %S/../Inputs/CrossImport -module-cache-path %t.mod/mcp == -req=cursor -print-raw-response -pos=11:15 -- -I %S/../Inputs/CrossImport -Xfrontend -enable-cross-import-overlays > %t.response
+// RUN: %sourcekitd-test -req=interface-gen-open -module A -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -I %S/../Inputs/CrossImport -module-cache-path %t.mod/mcp == -req=cursor -print-raw-response -pos=11:15 -- -I %S/../Inputs/CrossImport -Xfrontend -enable-cross-import-overlays > %t.response
 // RUN: %FileCheck --input-file %t.response %s
 //
 // CHECK: key.name: "From_ABAdditionsType"
@@ -20,6 +20,6 @@
 // underlying modules, and that the synthesized comment above each decl
 // originally from an overlay appears before any doc comments.
 //
-// RUN: %target-swift-frontend -emit-module-path %t.mod/_OtherCAdditions.swiftmodule -emit-module-doc-path %t.mod/_OtherCAdditions.swiftdoc -module-cache-path %t.mod/mcp -I %S/../Inputs/CrossImport %S/../Inputs/CrossImport/_OtherCAdditions.swift -parse-as-library -enable-cross-import-overlays -disable-implicit-concurrency-module-import
-// RUN: %sourcekitd-test -req=interface-gen -module Other -- -Xfrontend -disable-implicit-concurrency-module-import  -target %target-triple -I %S/../Inputs/CrossImport -I %t.mod/ -module-cache-path %t.mod/mcp > %t.response
+// RUN: %target-swift-frontend -emit-module-path %t.mod/_OtherCAdditions.swiftmodule -emit-module-doc-path %t.mod/_OtherCAdditions.swiftdoc -module-cache-path %t.mod/mcp -I %S/../Inputs/CrossImport %S/../Inputs/CrossImport/_OtherCAdditions.swift -parse-as-library -enable-cross-import-overlays -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import
+// RUN: %sourcekitd-test -req=interface-gen -module Other -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import  -target %target-triple -I %S/../Inputs/CrossImport -I %t.mod/ -module-cache-path %t.mod/mcp > %t.response
 // RUN: %diff -u %s.Other.response %t.response

test/SourceKit/InterfaceGen/gen_swiftonly_systemmodule.swift

@@ -7,9 +7,10 @@
 // RUN:     -o %t/SDK/Frameworks/SomeModule.framework/Modules/SomeModule.swiftmodule/%module-target-triple.swiftmodule \
 // RUN:     -swift-version 5 \
 // RUN:     -disable-implicit-concurrency-module-import \
+// RUN:     -disable-implicit-string-processing-module-import \
 // RUN:     %s
 
-// RUN: %sourcekitd-test -req=interface-gen -module SomeModule -- -Xfrontend -disable-implicit-concurrency-module-import  -sdk %t/SDK -Fsystem %t/SDK/Frameworks -target %target-triple > %t.response
+// RUN: %sourcekitd-test -req=interface-gen -module SomeModule -- -Xfrontend -disable-implicit-concurrency-module-import -Xfrontend -disable-implicit-string-processing-module-import -sdk %t/SDK -Fsystem %t/SDK/Frameworks -target %target-triple > %t.response
 // RUN: %diff -u %s.response %t.response
 
 public struct SomeValue {

test/api-digester/Outputs/cake-abi.json

@@ -18,6 +18,13 @@
         "declKind": "Import",
         "moduleName": "cake"
       },
+      {
+        "kind": "Import",
+        "name": "_StringProcessing",
+        "printedName": "_StringProcessing",
+        "declKind": "Import",
+        "moduleName": "cake"
+      },
       {
         "kind": "Import",
         "name": "cake",

test/api-digester/Outputs/cake.json

@@ -18,6 +18,13 @@
         "declKind": "Import",
         "moduleName": "cake"
       },
+      {
+        "kind": "Import",
+        "name": "_StringProcessing",
+        "printedName": "_StringProcessing",
+        "declKind": "Import",
+        "moduleName": "cake"
+      },
       {
         "kind": "Import",
         "name": "cake",