test: convert rm -rf && mkdir -p into %empty-directory

This converts the instances of the pattern for which we have a proper
substitution in lit.  This will make it easier to replace it
appropriately with Windows equivalents.

test/ClangImporter/private_frameworks.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 
 // FIXME: BEGIN -enable-source-import hackaround
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk-nosource) -emit-module -o %t %clang-importer-sdk-path/swift-modules/CoreGraphics.swift

test/ClangImporter/system-framework-search-path.swift

@@ -1,7 +1,6 @@
 // The clang module triggers a warning, make sure that -Fsystem has the effect of importing as system, which will suppress the warning.
 
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -typecheck -F %S/Inputs/systemframeworks -module-cache-path %t/mcp1 %s 2> %t/stderr-as-user.txt
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -typecheck -Fsystem %S/Inputs/systemframeworks -module-cache-path %t/mcp2 %s 2> %t/stderr-as-system.txt

test/Compatibility/MixAndMatch/witness_change.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -emit-module -o %t/SomeObjCModule.swiftmodule -module-name SomeObjCModule -I %t -I %S/Inputs -swift-version 3 %S/Inputs/SomeObjCModuleX.swift
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -emit-module -o %t/SomeSwift3Module.swiftmodule -module-name SomeSwift3Module -I %t -I %S/Inputs -swift-version 3 %s
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -emit-module -o %t/SomeSwift4Module.swiftmodule -module-name SomeSwift4Module -I %t -I %S/Inputs -swift-version 4 %S/Inputs/witness_change_swift4.swift

test/Compatibility/bridging-nsnumber-and-nsvalue.swift.gyb

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %gyb %s -o %t/bridging-nsnumber-and-nsvalue.swift
 // RUN: %target-swift-frontend -typecheck -verify %t/bridging-nsnumber-and-nsvalue.swift -swift-version 3
 

test/Constraints/bridging-nsnumber-and-nsvalue.swift.gyb

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %gyb %s -o %t/bridging-nsnumber-and-nsvalue.swift
 // RUN: %target-swift-frontend -typecheck -verify %t/bridging-nsnumber-and-nsvalue.swift -swift-version 4
 

test/Frontend/sil-merge-partial-modules.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 
 // RUN: %target-swift-frontend -emit-module -primary-file %s %S/Inputs/sil-merge-partial-modules-other.swift -module-name test -enable-resilience -o %t/partial.a.swiftmodule
 // RUN: %target-swift-frontend -emit-module %s -primary-file %S/Inputs/sil-merge-partial-modules-other.swift -module-name test -enable-resilience -o %t/partial.b.swiftmodule

test/IRGen/autolink-coff-x86.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 
 // RUN: %swift -target x86_64--windows-gnu -parse-as-library -parse-stdlib -emit-module-path %t/module.swiftmodule -module-name module -module-link-name module %s
 // RUN: %swift -target x86_64--windows-gnu -parse-as-library -parse-stdlib -module-name autolink -I %t -D MAIN_MODULE -emit-ir -o - %s | %FileCheck %s -check-prefix CHECK-GNU-IR

test/IRGen/cf.sil

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %utils/chex.py < %s > %t/cf.sil
 // RUN: %target-swift-frontend -assume-parsing-unqualified-ownership-sil -sdk %S/Inputs %t/cf.sil -emit-ir -import-cf-types | %FileCheck --check-prefix=CHECK --check-prefix=CHECK-%target-ptrsize %t/cf.sil
 

test/IRGen/generic_classes.sil

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %utils/chex.py < %s > %t/generic_classes.sil
 // RUN: %target-swift-frontend %t/generic_classes.sil -emit-ir | %FileCheck %t/generic_classes.sil --check-prefix=CHECK --check-prefix=CHECK-%target-runtime
 // RUN: %target-swift-frontend -Osize %t/generic_classes.sil -emit-ir | %FileCheck %t/generic_classes.sil --check-prefix=OSIZE

test/IRGen/generic_structs.sil

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %utils/chex.py < %s > %t/generic_structs.sil
 // RUN: %target-swift-frontend -assume-parsing-unqualified-ownership-sil %t/generic_structs.sil -emit-ir | %FileCheck %t/generic_structs.sil
 

test/IRGen/generic_vtable.swift

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %utils/chex.py < %s > %t/generic_vtable.swift
 // RUN: %target-swift-frontend %t/generic_vtable.swift -emit-ir | %FileCheck %t/generic_vtable.swift --check-prefix=CHECK
 

test/IRGen/keypaths.sil

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // -- Convert <i32 0x...> constants to decimal constants that LLVM will print
 // RUN: %utils/chex.py < %s > %t/keypaths.sil
 // RUN: %target-swift-frontend -emit-ir %s | %FileCheck %t/keypaths.sil --check-prefix=CHECK --check-prefix=CHECK-%target-ptrsize --check-prefix=CHECK-%target-os

test/IRGen/keypaths_objc.sil

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %utils/chex.py < %s > %t/keypaths_objc.sil
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -emit-ir %t/keypaths_objc.sil | %FileCheck %t/keypaths_objc.sil --check-prefix=CHECK --check-prefix=CHECK-%target-ptrsize
 // REQUIRES: objc_interop

test/IRGen/mixed_mode_class_with_unimportable_fields.sil

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -emit-module -o %t/UsingObjCStuff.swiftmodule -module-name UsingObjCStuff -I %t -I %S/Inputs/mixed_mode -swift-version 4 %S/Inputs/mixed_mode/UsingObjCStuff.swift
 // RUN: %target-swift-frontend -emit-ir -I %t -I %S/Inputs/mixed_mode -module-name main -swift-version 3 %s | %FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-%target-ptrsize
 // RUN: %target-swift-frontend -emit-ir -I %t -I %S/Inputs/mixed_mode -module-name main -swift-version 4 %s | %FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-%target-ptrsize

test/IRGen/mixed_mode_class_with_unimportable_fields.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -emit-module -o %t/UsingObjCStuff.swiftmodule -module-name UsingObjCStuff -I %t -I %S/Inputs/mixed_mode -swift-version 4 %S/Inputs/mixed_mode/UsingObjCStuff.swift
 // RUN: %target-swift-frontend -emit-ir -I %t -I %S/Inputs/mixed_mode -module-name main -swift-version 3 %s | %FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-%target-ptrsize --check-prefix=CHECK-V3
 // RUN: %target-swift-frontend -emit-ir -I %t -I %S/Inputs/mixed_mode -module-name main -swift-version 4 %s | %FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-%target-ptrsize --check-prefix=CHECK-V4

test/IRGen/objc_types_as_member.sil

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %build-irgen-test-overlays
 // RUN: %target-swift-frontend(mock-sdk: -sdk %S/Inputs -I %t) %s -emit-ir | %FileCheck %s
 

test/IRGen/two_tag_enums.swift.gyb

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %gyb %s > %t/main.swift
 // RUN: %target-swift-frontend -emit-ir %t/main.swift | %FileCheck %s
 

test/Index/Store/output-failure.swift

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: mkdir %t/idx
 
 // Before indexing, do a dry-run to ensure any clang modules are cached. We

test/Index/Store/record-hashing.swift

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: echo "func foo() {}" > %t/theinput.swift
 
 // RUN: %target-swift-frontend -index-store-path %t/idx -typecheck %t/theinput.swift -o %t/s.o

test/Index/Store/record-with-compile-error.swift

@@ -1,7 +1,6 @@
 // XFAIL: linux
 
-// RUN: rm -rf %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -index-store-path %t/idx -o %t/file.o -typecheck %s -verify
 // RUN: c-index-test core -print-record %t/idx | %FileCheck %s
 

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

@@ -1,7 +1,6 @@
 // XFAIL: linux
 
-// RUN: rm -rf %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -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 -c -index-store-path %t/idx_opt %s -o %t/file1.o -module-name some_module_test -O

test/Index/Store/unit-multiple-sourcefiles.swift

@@ -2,7 +2,7 @@
 
 //===--- Building source files separately with a module merge at the end
 
-// RUN: rm -rf %t && mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: touch %t/s1.swift %t/s2.swift
 // RUN: %target-swift-frontend -index-store-path %t/idx -primary-file %t/s1.swift %t/s2.swift -o %t/s1.o -c -module-name main -emit-module -emit-module-path %t/s1.swiftmodule
 // RUN: %target-swift-frontend -index-store-path %t/idx %t/s1.swift -primary-file %t/s2.swift -o %t/s2.o -c -module-name main -emit-module -emit-module-path %t/s2.swiftmodule
@@ -11,7 +11,7 @@
 
 //===--- Building source files together (e.g. WMO)
 
-// RUN: rm -rf %t && mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: touch %t/s1.swift %t/s2.swift
 // RUN: %target-swift-frontend -index-store-path %t/idx %t/s1.swift %t/s2.swift -o %t/s1.o -o %t/s2.o -c -module-name main -emit-module -emit-module-path %t/main.swiftmodule
 // RUN: c-index-test core -print-unit %t/idx | %FileCheck %s

test/Index/Store/unit-one-sourcefile.swift

@@ -4,12 +4,12 @@
 // RUN: %target-swift-frontend -index-store-path %t/idx %s -o %t/file1.o -typecheck
 // RUN: c-index-test core -print-unit %t/idx | %FileCheck %s -check-prefix=FILE1
 
-// RUN: rm -rf %t && mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: touch %t/s2.swift
 // RUN: %target-swift-frontend -index-store-path %t/idx -primary-file %s %t/s2.swift -o %t/file1.o -typecheck
 // RUN: c-index-test core -print-unit %t/idx | %FileCheck %s -check-prefix=FILE1
 
-// RUN: rm -rf %t && mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: touch %t/s2.swift
 // RUN: %target-swift-frontend -index-store-path %t/idx %s -primary-file %t/s2.swift -o %t/file2.o -typecheck
 // RUN: c-index-test core -print-unit %t/idx | %FileCheck %s -check-prefix=FILE2

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

@@ -9,7 +9,7 @@
 
 // FIXME: index the bridging header!
 
-// RUN: rm -rf %t && mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: echo 'import ClangModuleA' > %t/s2.swift
 // RUN: %target-swift-frontend -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
 // RUN: c-index-test core -print-unit %t/idx > %t/both.txt

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

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir %t
+// RUN: %empty-directory(%t)
 
 // RUN: %target-swift-frontend -index-store-path %t/idx %S/Inputs/SwiftModuleA.swift -emit-module -o %t/SwiftModuleA.swiftmodule
 // RUN: %target-swift-frontend -index-store-path %t/idx %S/Inputs/SwiftModuleB.swift -emit-module -o %t/SwiftModuleB.swiftmodule -I %t

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

@@ -1,7 +1,6 @@
 // XFAIL: linux
 
-// RUN: rm -rf %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -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) -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

test/Index/index_module.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 //
 // RUN: %target-swift-frontend -emit-module -o %t %s
 // RUN: %target-swift-ide-test -print-indexed-symbols -module-name index_module -source-filename %s > %t.out

test/Index/index_system_module.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 //
 // RUN: %target-swift-frontend -emit-module -o %t %S/Inputs/my_system_overlay/my_system_overlay.swift -Xcc -I -Xcc %S/Inputs/my_system_overlay
 // RUN: %target-swift-ide-test -print-indexed-symbols -module-to-print my_system_overlay -source-filename %s -I %t -Xcc -I -Xcc %S/Inputs/my_system_overlay > %t.out

test/Index/roles.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 //
 // RUN: %target-swift-frontend -emit-module -o %t %S/Inputs/imported_swift_module.swift
 // RUN: %target-swift-ide-test -print-indexed-symbols -source-filename %s -I %t | %FileCheck %s

test/Interpreter/SDK/mixed_mode_class_with_missing_properties.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -whole-module-optimization -emit-module-path %t/UsingObjCStuff.swiftmodule -c -o %t/UsingObjCStuff.o -module-name UsingObjCStuff -I %t -I %S/Inputs/mixed_mode -swift-version 4 -parse-as-library %S/Inputs/mixed_mode/UsingObjCStuff.swift
 // RUN: %target-build-swift -o %t/a.out.v3 -I %t -I %S/Inputs/mixed_mode -module-name main -swift-version 3 %t/main.swift %t/UsingObjCStuff.o

test/Interpreter/SDK/objc_swift3_deprecated_objc_inference.swift

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t  &&  mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift -swift-version 4 -Xfrontend -enable-swift3-objc-inference %s -o %t/a.out
 // RUN: %target-run %t/a.out 2>&1 | %FileCheck %s -check-prefix=CHECK_WARNINGS
 // RUN: env SWIFT_DEBUG_IMPLICIT_OBJC_ENTRYPOINT=0 SIMCTL_CHILD_SWIFT_DEBUG_IMPLICIT_OBJC_ENTRYPOINT=0 %target-run %t/a.out 2>&1 | %FileCheck %s -check-prefix=CHECK_NOTHING

test/Interpreter/conditional_conformances_runtime.swift

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t  &&  mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift %s -o %t/a.out
 // RUN: %target-run %t/a.out
 // REQUIRES: executable_test

test/Interpreter/enforce_exclusive_access.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift -swift-version 4 %s -o %t/a.out -enforce-exclusivity=checked -Onone
 //
 // RUN: %target-run %t/a.out

test/Interpreter/enforce_exclusive_access_backtrace.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift -swift-version 3 %s -o %t/a.out -enforce-exclusivity=checked -Onone
 //
 // RUN: %target-run %t/a.out 2>&1 | %FileCheck %s

test/Interpreter/objc_types_as_members.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 //
 // RUN: %target-clang -fobjc-arc %S/Inputs/ObjCClasses/ObjCClasses.m -c -o %t/ObjCClasses.o
 // RUN: %target-build-swift -O -I %S/Inputs/ObjCClasses/ -Xlinker %t/ObjCClasses.o %s -o %t/a.out

test/Interpreter/protocol_initializers.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift -swift-version 5 %s -o %t/a.out
 //
 // RUN: %target-run %t/a.out

test/Interpreter/protocol_initializers_class.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift -swift-version 5 %s -o %t/a.out
 //
 // RUN: %target-run %t/a.out

test/Interpreter/subclass_existentials.swift

@@ -10,8 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift %s -o %t/a.out
 // RUN: %target-run %t/a.out
 // REQUIRES: executable_test

test/Interpreter/subclass_existentials_objc.swift

@@ -10,8 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift %s -o %t/a.out
 // RUN: %target-run %t/a.out
 // REQUIRES: executable_test

test/Migrator/always_remove_old_remap_file.swift

@@ -1,4 +1,5 @@
-// RUN: rm -rf %t && mkdir -p %t && cp %s %t/input.swift
+// RUN: %empty-directory(%t)
+// RUN: cp %s %t/input.swift
 // RUN: %target-swift-frontend -c -update-code -primary-file %t/input.swift -emit-migrated-file-path %t/always_remove_old_remap_file.result -emit-remap-file-path %t/always_remove_old_remap_file.remap -o /dev/null
 // RUN: ls %t/always_remove_old_remap_file.remap
 

test/Migrator/double_fixit_ok.swift

@@ -1,5 +1,6 @@
 // RUN: %target-swift-frontend -typecheck %s -swift-version 3
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -typecheck -update-code -primary-file %s -emit-migrated-file-path %t/double_fixit_ok.result -swift-version 3
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -typecheck -update-code -primary-file %s -emit-migrated-file-path %t/double_fixit_ok.result -swift-version 3
 // RUN: diff -u %s.expected %t/double_fixit_ok.result
 // RUN: %target-swift-frontend -typecheck %s.expected -swift-version 4
 

test/Migrator/double_fixit_ok.swift.expected

@@ -1,5 +1,6 @@
 // RUN: %target-swift-frontend -typecheck %s -swift-version 3
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -typecheck -update-code -primary-file %s -emit-migrated-file-path %t/double_fixit_ok.result -swift-version 3
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -typecheck -update-code -primary-file %s -emit-migrated-file-path %t/double_fixit_ok.result -swift-version 3
 // RUN: diff -u %s.expected %t/double_fixit_ok.result
 // RUN: %target-swift-frontend -typecheck %s.expected -swift-version 4
 

test/Migrator/no_double_edit_ast_pass.swift

@@ -1,7 +1,8 @@
 // REQUIRES: OS=macosx
 // REQUIRES: objc_interop
 // RUN: %target-swift-frontend -typecheck %s -F %S/mock-sdk -swift-version 3
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -c -F %S/mock-sdk -api-diff-data-file %S/DoubleEditAPI.json -update-code -primary-file %s -emit-migrated-file-path %t/no_double_edit_ast_pass.result -swift-version 3 -o /dev/null
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -c -F %S/mock-sdk -api-diff-data-file %S/DoubleEditAPI.json -update-code -primary-file %s -emit-migrated-file-path %t/no_double_edit_ast_pass.result -swift-version 3 -o /dev/null
 // RUN: diff -u %s.expected %t/no_double_edit_ast_pass.result
 
 import Bar

test/Migrator/no_double_edit_ast_pass.swift.expected

@@ -1,7 +1,8 @@
 // REQUIRES: OS=macosx
 // REQUIRES: objc_interop
 // RUN: %target-swift-frontend -typecheck %s -F %S/mock-sdk -swift-version 3
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -c -F %S/mock-sdk -api-diff-data-file %S/DoubleEditAPI.json -update-code -primary-file %s -emit-migrated-file-path %t/no_double_edit_ast_pass.result -swift-version 3 -o /dev/null
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -c -F %S/mock-sdk -api-diff-data-file %S/DoubleEditAPI.json -update-code -primary-file %s -emit-migrated-file-path %t/no_double_edit_ast_pass.result -swift-version 3 -o /dev/null
 // RUN: diff -u %s.expected %t/no_double_edit_ast_pass.result
 
 import Bar

test/Migrator/no_duplicate_aarch64_use_tbi.swift

@@ -1,7 +1,8 @@
 // REQUIRES: OS=ios
 // REQUIRES: CPU=arm64
 // RUN: %target-swift-frontend -typecheck %s -swift-version 3
-// RUN: rm -rf %t && mkdir -p %t && cd %t && %swiftc_driver -c -update-code -target arm64-apple-ios10.3 -output-file-map %S/Inputs/no_duplicate_aarch64_use_tbi_ofm.json -swift-version 3 %s -v
+// RUN: %empty-directory(%t)
+// RUN: cd %t && %swiftc_driver -c -update-code -target arm64-apple-ios10.3 -output-file-map %S/Inputs/no_duplicate_aarch64_use_tbi_ofm.json -swift-version 3 %s -v
 // RUN: cd %t && %swiftc_driver -c -update-code -target arm64-apple-ios10.3 -output-file-map %S/Inputs/no_duplicate_aarch64_use_tbi_ofm.json -swift-version 3 %s -### > %t/driver_actions.txt
 // RUN: %FileCheck --check-prefix=CHECK-REMAP %s < %t/no_duplicate_aarch64_use_tbi.remap
 // RUN: %FileCheck --check-prefix=CHECK-ACTIONS %s < %t/driver_actions.txt

test/Migrator/nsopengl_openglversion.swift

@@ -1,7 +1,8 @@
 // REQUIRES: objc_interop
 // REQUIRES: OS=macosx
 // RUN: %target-swift-frontend -typecheck -swift-version 3 %s
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -c -update-code -disable-migrator-fixits -primary-file %s -emit-migrated-file-path %t/nsopengl_openglversion.swift.result -o /dev/null
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -c -update-code -disable-migrator-fixits -primary-file %s -emit-migrated-file-path %t/nsopengl_openglversion.swift.result -o /dev/null
 // RUN: diff -u %S/nsopengl_openglversion.swift.expected %t/nsopengl_openglversion.swift.result
 // RUN: %target-swift-frontend -typecheck -swift-version 4 %t/nsopengl_openglversion.swift.result
 

test/Migrator/nsopengl_openglversion.swift.expected

@@ -1,7 +1,8 @@
 // REQUIRES: objc_interop
 // REQUIRES: OS=macosx
 // RUN: %target-swift-frontend -typecheck -swift-version 3 %s
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -c -update-code -disable-migrator-fixits -primary-file %s -emit-migrated-file-path %t/nsopengl_openglversion.swift.result -o /dev/null
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -c -update-code -disable-migrator-fixits -primary-file %s -emit-migrated-file-path %t/nsopengl_openglversion.swift.result -o /dev/null
 // RUN: diff -u %S/nsopengl_openglversion.swift.expected %t/nsopengl_openglversion.swift.result
 // RUN: %target-swift-frontend -typecheck -swift-version 4 %t/nsopengl_openglversion.swift.result
 

test/Migrator/rdar31892850.swift

@@ -1,4 +1,5 @@
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -typecheck -primary-file %s -module-cache-path %t/mcp -emit-remap-file-path %t/edits.remap
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -typecheck -primary-file %s -module-cache-path %t/mcp -emit-remap-file-path %t/edits.remap
 // RUN: %FileCheck %s -input-file=%t/edits.remap
 
 enum SomeStringEnum : String {
@@ -14,12 +15,12 @@ func foo() {
 // CHECK:[
 // CHECK:  {
 // CHECK:    "file": "{{.*}}rdar31892850.swift",
-// CHECK:    "offset": 305,
+// CHECK:    "offset": 306,
 // CHECK:    "text": "SomeStringEnum(rawValue: "
 // CHECK:  },
 // CHECK:  {
 // CHECK:    "file": "{{.*}}rdar31892850.swift",
-// CHECK:    "offset": 309,
+// CHECK:    "offset": 310,
 // CHECK:    "text": ")!"
 // CHECK:  }
 // CHECK:]

test/Migrator/static-abs-swift-abs-float80.swift

@@ -1,7 +1,8 @@
 // REQUIRES: objc_interop
 // REQUIRES: CPU=x86_64
 // RUN: %target-swift-frontend -typecheck -swift-version 3 %s
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -c -update-code -primary-file %s -emit-migrated-file-path %t/static-abs-swift-abs-float80.swift.result -emit-remap-file-path %t/static-abs-swift-abs-float80.swift.remap -o /dev/null
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -c -update-code -primary-file %s -emit-migrated-file-path %t/static-abs-swift-abs-float80.swift.result -emit-remap-file-path %t/static-abs-swift-abs-float80.swift.remap -o /dev/null
 // RUN: diff -u %S/static-abs-swift-abs-float80.swift.expected %t/static-abs-swift-abs-float80.swift.result
 // RUN: %target-swift-frontend -typecheck -swift-version 4 %t/static-abs-swift-abs-float80.swift.result
 

test/Migrator/static-abs-swift-abs-float80.swift.expected

@@ -1,7 +1,8 @@
 // REQUIRES: objc_interop
 // REQUIRES: CPU=x86_64
 // RUN: %target-swift-frontend -typecheck -swift-version 3 %s
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -c -update-code -primary-file %s -emit-migrated-file-path %t/static-abs-swift-abs-float80.swift.result -emit-remap-file-path %t/static-abs-swift-abs-float80.swift.remap -o /dev/null
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -c -update-code -primary-file %s -emit-migrated-file-path %t/static-abs-swift-abs-float80.swift.result -emit-remap-file-path %t/static-abs-swift-abs-float80.swift.remap -o /dev/null
 // RUN: diff -u %S/static-abs-swift-abs-float80.swift.expected %t/static-abs-swift-abs-float80.swift.result
 // RUN: %target-swift-frontend -typecheck -swift-version 4 %t/static-abs-swift-abs-float80.swift.result
 

test/Migrator/static-abs-swift-abs.swift

@@ -1,6 +1,7 @@
 // REQUIRES: objc_interop
 // RUN: %target-swift-frontend -typecheck -swift-version 3 %s
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -c -update-code -primary-file %s -emit-migrated-file-path %t/static-abs-swift-abs.swift.result -emit-remap-file-path %t/static-abs-swift-abs.swift.remap -o /dev/null
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -c -update-code -primary-file %s -emit-migrated-file-path %t/static-abs-swift-abs.swift.result -emit-remap-file-path %t/static-abs-swift-abs.swift.remap -o /dev/null
 // RUN: diff -u %S/static-abs-swift-abs.swift.expected %t/static-abs-swift-abs.swift.result
 // RUN: %target-swift-frontend -typecheck -swift-version 4 %t/static-abs-swift-abs.swift.result
 

test/Migrator/static-abs-swift-abs.swift.expected

@@ -1,6 +1,7 @@
 // REQUIRES: objc_interop
 // RUN: %target-swift-frontend -typecheck -swift-version 3 %s
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -c -update-code -primary-file %s -emit-migrated-file-path %t/static-abs-swift-abs.swift.result -emit-remap-file-path %t/static-abs-swift-abs.swift.remap -o /dev/null
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -c -update-code -primary-file %s -emit-migrated-file-path %t/static-abs-swift-abs.swift.result -emit-remap-file-path %t/static-abs-swift-abs.swift.remap -o /dev/null
 // RUN: diff -u %S/static-abs-swift-abs.swift.expected %t/static-abs-swift-abs.swift.result
 // RUN: %target-swift-frontend -typecheck -swift-version 4 %t/static-abs-swift-abs.swift.result
 

test/Migrator/to_int_max.swift

@@ -1,6 +1,7 @@
 // REQUIRES: objc_interop
 // RUN: %target-swift-frontend -typecheck -swift-version 3 %s
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -c -update-code -primary-file %s -emit-migrated-file-path %t/to_int_max.result -emit-remap-file-path %t/to_int_max.remap -o /dev/null
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -c -update-code -primary-file %s -emit-migrated-file-path %t/to_int_max.result -emit-remap-file-path %t/to_int_max.remap -o /dev/null
 // RUN: diff -u %S/to_int_max.swift.expected %t/to_int_max.result
 // RUN: %target-swift-frontend -typecheck -swift-version 4 %t/to_int_max.result
 

test/Migrator/to_int_max.swift.expected

@@ -1,6 +1,7 @@
 // REQUIRES: objc_interop
 // RUN: %target-swift-frontend -typecheck -swift-version 3 %s
-// RUN: rm -rf %t && mkdir -p %t && %target-swift-frontend -c -update-code -primary-file %s -emit-migrated-file-path %t/to_int_max.result -emit-remap-file-path %t/to_int_max.remap -o /dev/null
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -c -update-code -primary-file %s -emit-migrated-file-path %t/to_int_max.result -emit-remap-file-path %t/to_int_max.remap -o /dev/null
 // RUN: diff -u %S/to_int_max.swift.expected %t/to_int_max.result
 // RUN: %target-swift-frontend -typecheck -swift-version 4 %t/to_int_max.result
 

test/Misc/serialized-diagnostics-file.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 
 // RUN: not %target-swift-frontend -typecheck -serialize-diagnostics-path %t/nonexistent/some.dia %s 2>%t.err.txt
 // RUN: %FileCheck --input-file=%t.err.txt %s -check-prefix=OPEN-FAIL

test/Misc/stats_dir.swift

@@ -1,23 +1,23 @@
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -c -o %t/out.o -stats-output-dir %t %s
 // RUN: %utils/process-stats-dir.py --set-csv-baseline %t/frontend.csv %t
 // RUN: %FileCheck -input-file %t/frontend.csv %s
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -c -o %t/out.o -stats-output-dir %t %s
 // RUN: %utils/process-stats-dir.py --set-csv-baseline %t/frontend.csv --exclude-timers %t
 // RUN: %FileCheck -input-file %t/frontend.csv --implicit-check-not '{{time.swift}}' %s
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -c -o %t/out.o -stats-output-dir %t %s
 // RUN: %utils/process-stats-dir.py --set-csv-baseline %t/frontend.csv --select-stat NumSourceLines --select-stat NumIRFunctions --select-stat NumLLVMBytesOutput %t
 // RUN: %FileCheck -input-file %t/frontend.csv %s
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -c -wmo -num-threads 4 -o %t/out.o -stats-output-dir %t %s
 // RUN: %utils/process-stats-dir.py --set-csv-baseline %t/frontend.csv %t
 // RUN: %FileCheck -input-file %t/frontend.csv %s
 // RUN: echo '9000000000	"LLVM.NumLLVMBytesOutput"	1' >>%t/frontend.csv
 // RUN: not %utils/process-stats-dir.py --compare-to-csv-baseline %t/frontend.csv %t
 
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swiftc_driver -c -o %t/out.o -stats-output-dir %t %s
 // RUN: %utils/process-stats-dir.py --set-csv-baseline %t/driver.csv %t
 // RUN: %FileCheck -input-file %t/driver.csv %s

test/Misc/stats_dir_failure_count.swift

@@ -1,5 +1,5 @@
 // Check that a failed process-tree emits nonzero failure counters
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: echo zzz >%t/other.swift
 // RUN: not %target-swiftc_driver -D BROKEN -j 2 -typecheck -stats-output-dir %t %s %t/other.swift
 // RUN: %utils/process-stats-dir.py --set-csv-baseline %t/stats.csv %t
@@ -8,7 +8,7 @@
 // FAILURE: {{"Frontend.NumProcessFailures"	2$}}
 
 // Check that a successful process-tree emits no nonzero failure counters
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: echo 'let x : Int = 1' >%t/other.swift
 // RUN: %target-swiftc_driver -j 2 -typecheck -stats-output-dir %t %s %t/other.swift
 // RUN: %utils/process-stats-dir.py --set-csv-baseline %t/stats.csv %t

test/Misc/stats_dir_long_path_name.swift

@@ -1,5 +1,5 @@
 // REQUIRES: OS=macosx
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: mkdir -p %t/very-long-directory-name-that-contains-over-128-characters-which-is-not-enough-to-be-illegal-on-its-own-but-presents
 // RUN: cp %s %t/very-long-directory-name-that-contains-over-128-characters-which-is-not-enough-to-be-illegal-on-its-own-but-presents/a-problem-when-combined-with-other-long-path-elements-and-filenames-to-exceed-256-characters-combined-because-yay-arbitrary-limits-amirite.swift
 // RUN: touch %t/main.swift

test/Misc/stats_dir_tracer.swift

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swiftc_driver -o %t/main -module-name main -stats-output-dir %t %s -trace-stats-events
 // RUN: %FileCheck -input-file %t/*.csv %s
 

test/PCMacro/defer.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/didset.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/else.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/elseif.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/for.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/func_decls.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/func_throw_notype.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/getset.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/if.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/init.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/mutation.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/nested_function.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/operators.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/pc_and_log.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -Xfrontend -playground-high-performance -Xfrontend -playground -Xfrontend -debugger-support -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift %S/../PlaygroundTransform/Inputs/PlaygroundsRuntime.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/plus_equals.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PCMacro/switch.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -pc-macro -o %t/main %S/Inputs/PCMacroRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/Parse/ConditionalCompilation/can_import_idempotent.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 //
 // RUN: echo "public var dummyVar = Int()" | %target-swift-frontend -module-name DummyModule -emit-module -o %t -
 // RUN: %target-swift-frontend -typecheck -verify -I %t %s

test/Parse/ConditionalCompilation/switch_case_executable.swift

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift %s -o %t/test1 -module-name main -D PATTERN_1 
 // RUN: %target-build-swift %s -o %t/test2 -module-name main -D PATTERN_2
 // RUN: %target-run %t/test1 | %FileCheck -check-prefix=CHECK -check-prefix=CHECK1 %s

test/PlaygroundTransform/generics.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: cp %s %t/main.swift
 // RUN: %target-build-swift -Xfrontend -playground -Xfrontend -debugger-support -o %t/main %S/Inputs/PlaygroundsRuntime.swift %t/main.swift
 // RUN: %target-run %t/main | %FileCheck %s

test/PrintAsObjC/availability.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -emit-module -o %t %s -disable-objc-attr-requires-foundation-module
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -parse-as-library %t/availability.swiftmodule -typecheck -emit-objc-header-path %t/availability.h -import-objc-header %S/../Inputs/empty.h -disable-objc-attr-requires-foundation-module
 // RUN: %FileCheck %s < %t/availability.h

test/PrintAsObjC/never.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -emit-module -o %t %s -module-name never -disable-objc-attr-requires-foundation-module
 // RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -parse-as-library %t/never.swiftmodule -typecheck -emit-objc-header-path %t/never.h -disable-objc-attr-requires-foundation-module
 // RUN: %FileCheck %s < %t/never.h

test/PrintAsObjC/swift3_deprecated_objc_inference.swift

@@ -1,7 +1,6 @@
 // REQUIRES: objc_interop
 
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 
 // FIXME: BEGIN -enable-source-import hackaround
 // RUN:  %target-swift-frontend(mock-sdk: -sdk %S/../Inputs/clang-importer-sdk -I %t) -emit-module -o %t %S/../Inputs/clang-importer-sdk/swift-modules/ObjectiveC.swift

test/PrintAsObjC/versioned.swift

@@ -1,7 +1,6 @@
 // REQUIRES: objc_interop
 
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 
 // FIXME: BEGIN -enable-source-import hackaround
 // RUN:  %target-swift-frontend(mock-sdk: -sdk %S/../Inputs/clang-importer-sdk -I %t) -emit-module -o %t %S/../Inputs/clang-importer-sdk/swift-modules/ObjectiveC.swift

test/Prototypes/BigInt.swift

@@ -10,7 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 // XFAIL: linux
-// RUN: rm -rf %t ; mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift -swift-version 4 -o %t/a.out %s
 // RUN: %target-run %t/a.out
 // REQUIRES: executable_test

test/Prototypes/property_behaviors/lazy.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift -Xfrontend -enable-experimental-property-behaviors %s -o %t/a.out
 // RUN: %target-run %t/a.out
 // REQUIRES: executable_test

test/Runtime/crash_without_backtrace.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift %s -o %t/out
 // RUN: not --crash %t/out 2>&1 | %FileCheck %s
 

test/Runtime/crash_without_backtrace_optimized.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift -O %s -o %t/out
 // RUN: not --crash %t/out 2>&1 | %FileCheck %s
 

test/Runtime/linux-fatal-backtrace.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift %s -o %t/a.out
 // RUN: not --crash %t/a.out 2>&1 | PYTHONPATH=%lldb-python-path %utils/symbolicate-linux-fatal %t/a.out - | %utils/backtrace-check -u
 // REQUIRES: executable_test

test/SIL/Serialization/basic.sil

@@ -1,6 +1,5 @@
 // First parse this and then emit a *.sib. Then read in the *.sib, then recreate
-// RUN: rm -rfv %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-sil-opt %s -emit-sib -o %t/tmp.sib -module-name borrow
 // RUN: %target-sil-opt %t/tmp.sib -o %t/tmp.2.sib -module-name borrow
 // RUN: %target-sil-opt %t/tmp.2.sib -module-name borrow | %FileCheck %s

test/SIL/Serialization/borrow.sil

@@ -1,6 +1,5 @@
 // First parse this and then emit a *.sib. Then read in the *.sib, then recreate
-// RUN: rm -rfv %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-sil-opt %s -emit-sib -o %t/tmp.sib -module-name borrow
 // RUN: %target-sil-opt %t/tmp.sib -o %t/tmp.2.sib -module-name borrow
 // RUN: %target-sil-opt %t/tmp.2.sib -module-name borrow | %FileCheck %s

test/SIL/Serialization/borrow_argument.sil

@@ -1,6 +1,5 @@
 // First parse this and then emit a *.sib. Then read in the *.sib, then recreate
-// RUN: rm -rfv %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-sil-opt -enable-sil-ownership %s -emit-sib -o %t/tmp.sib -module-name borrow
 // RUN: %target-sil-opt -enable-sil-ownership %t/tmp.sib -o %t/tmp.2.sib -module-name borrow
 // RUN: %target-sil-opt -enable-sil-ownership %t/tmp.2.sib -module-name borrow | %FileCheck %s

test/SIL/Serialization/boxes.sil

@@ -1,6 +1,5 @@
 // First parse this and then emit a *.sib. Then read in the *.sib, then recreate
-// RUN: rm -rfv %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-sil-opt %s -emit-sib -o %t/tmp.sib -module-name boxes
 // RUN: %target-sil-opt %t/tmp.sib -o %t/tmp.2.sib -module-name boxes
 // RUN: %target-sil-opt %t/tmp.2.sib -module-name boxes | %FileCheck %s

test/SIL/Serialization/copy_value_destroy_value.sil

@@ -1,6 +1,5 @@
 // First parse this and then emit a *.sib. Then read in the *.sib, then recreate
-// RUN: rm -rfv %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-sil-opt %s -emit-sib -o %t/tmp.sib -module-name copydestroy_value
 // RUN: %target-sil-opt %t/tmp.sib -o %t/tmp.2.sib -module-name copydestroy_value
 // RUN: %target-sil-opt %t/tmp.2.sib -module-name copydestroy_value | %FileCheck %s

test/SIL/Serialization/keypath.sil

@@ -1,6 +1,5 @@
 // First parse this and then emit a *.sib. Then read in the *.sib, then recreate
-// RUN: rm -rfv %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-sil-opt %s -emit-sib -o %t/tmp.sib -module-name boxes
 // RUN: %target-sil-opt %t/tmp.sib -o %t/tmp.2.sib -module-name boxes
 // RUN: %target-sil-opt %t/tmp.2.sib -module-name boxes | %FileCheck %s

test/SIL/Serialization/literals.sil

@@ -1,6 +1,5 @@
 // First parse this and then emit a *.sib. Then read in the *.sib, then recreate
-// RUN: rm -rfv %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-sil-opt -enable-sil-ownership %s -emit-sib -o %t/tmp.sib -module-name literals
 // RUN: %target-sil-opt -enable-sil-ownership %t/tmp.sib -o %t/tmp.2.sib -module-name literals
 // RUN: %target-sil-opt -enable-sil-ownership %t/tmp.2.sib -module-name literals | %FileCheck %s

test/SIL/Serialization/opaque_values_serialize.sil

@@ -1,6 +1,5 @@
 // First parse this and then emit a *.sib. Then read in the *.sib, then recreate
-// RUN: rm -rfv %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // FIXME: <rdar://problem/29281364> sil-opt -verify is broken
 // RUN: %target-sil-opt %s -assume-parsing-unqualified-ownership-sil -enable-sil-opaque-values -emit-sib -o %t/tmp.sib -module-name opaqueval
 // RUN: %target-sil-opt %t/tmp.sib -assume-parsing-unqualified-ownership-sil -enable-sil-opaque-values -verify -o %t/tmp.2.sib -module-name opaqueval

test/SIL/Serialization/ownership_qualified_memopts.sil

@@ -1,6 +1,5 @@
 // First parse this and then emit a *.sib. Then read in the *.sib, then recreate
-// RUN: rm -rfv %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-sil-opt %s -emit-sib -o %t/tmp.sib -module-name ownership_qualified_memopts
 // RUN: %target-sil-opt %t/tmp.sib -o %t/tmp.2.sib -module-name ownership_qualified_memopts
 // RUN: %target-sil-opt %t/tmp.2.sib -module-name ownership_qualified_memopts | %FileCheck %s

test/SIL/Serialization/unmanaged.sil

@@ -1,6 +1,5 @@
 // First parse this and then emit a *.sib. Then read in the *.sib, then recreate
-// RUN: rm -rfv %t
-// RUN: mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-sil-opt %s -emit-sib -o %t/tmp.sib -module-name unmanaged
 // RUN: %target-sil-opt %t/tmp.sib -o %t/tmp.2.sib -module-name unmanaged
 // RUN: %target-sil-opt %t/tmp.2.sib -module-name unmanaged | %FileCheck %s

test/SILGen/availability_overloads.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -emit-module-path %t/availability_overloads_other.swiftmodule -emit-module -primary-file %S/Inputs/availability_overloads_other.swift
 
 // RUN: %target-swift-frontend -swift-version 3 -I %t -emit-silgen -primary-file %s

test/SILGen/external-keypath.swift

@@ -1,5 +1,4 @@
-// RUN: rm -rf %t
-// RUN: mkdir -p %t
+// RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -emit-module -o %t/ExternalKeyPaths.swiftmodule -module-name ExternalKeyPaths %S/Inputs/ExternalKeyPaths.swift
 // RUN: %target-swift-frontend -enable-key-path-resilience -emit-silgen -I %t %s | %FileCheck %s
 

test/SILGen/pgo_checked_cast.swift

@@ -1,4 +1,4 @@
-// RUN: rm -rf %t && mkdir %t
+// RUN: %empty-directory(%t)
 // RUN: %target-build-swift %s -profile-generate -Xfrontend -disable-incremental-llvm-codegen -module-name pgo_checked_cast -o %t/main
 // RUN: env LLVM_PROFILE_FILE=%t/default.profraw %target-run %t/main
 // RUN: %llvm-profdata merge %t/default.profraw -o %t/default.profdata