Remove UnqualifiedLookupFlags::KnownPrivate

include/swift/AST/NameLookup.h

@@ -215,18 +215,16 @@ public:
 };
 
 enum class UnqualifiedLookupFlags {
-  /// This lookup is known to not affect downstream files.
-  KnownPrivate = 0x01,
   /// This lookup should only return types.
-  TypeLookup = 0x02,
+  TypeLookup            = 1 << 0,
   /// This lookup should consider declarations within protocols to which the
   /// context type conforms.
-  AllowProtocolMembers = 0x04,
+  AllowProtocolMembers  = 1 << 2,
   /// Don't check access when doing lookup into a type.
-  IgnoreAccessControl = 0x08,
+  IgnoreAccessControl   = 1 << 3,
   /// This lookup should include results from outside the innermost scope with
   /// results.
-  IncludeOuterResults = 0x10,
+  IncludeOuterResults   = 1 << 4,
 };
 
 using UnqualifiedLookupOptions = OptionSet<UnqualifiedLookupFlags>;

lib/AST/NameLookup.cpp

@@ -119,7 +119,6 @@ void swift::simple_display(llvm::raw_ostream &out,
       {UnqualifiedLookupFlags::AllowProtocolMembers, "AllowProtocolMembers"},
       {UnqualifiedLookupFlags::IgnoreAccessControl, "IgnoreAccessControl"},
       {UnqualifiedLookupFlags::IncludeOuterResults, "IncludeOuterResults"},
-      {UnqualifiedLookupFlags::KnownPrivate, "KnownPrivate"},
       {UnqualifiedLookupFlags::TypeLookup, "TypeLookup"},
   };
 

lib/AST/NameLookupRequests.cpp

@@ -439,11 +439,7 @@ evaluator::DependencySource UnqualifiedLookupRequest::readDependencySource(
   // with the existing scheme, but the existing scheme is totally ad-hoc. We
   // should remove this flag and ensure that non-cascading qualified lookups
   // occur in the right contexts instead.
-  auto scope = evaluator::DependencyScope::Cascading;
-  if (desc.Options.contains(UnqualifiedLookupFlags::KnownPrivate)) {
-    scope = evaluator::DependencyScope::Private;
-  }
-  return {desc.DC->getParentSourceFile(), scope};
+  return {desc.DC->getParentSourceFile(), evaluator::DependencyScope::Cascading};
 }
 
 void UnqualifiedLookupRequest::writeDependencySink(

lib/Sema/CSSimplify.cpp

@@ -7291,7 +7291,6 @@ ConstraintSystem::SolutionKind ConstraintSystem::simplifyMemberConstraint(
               DeclNameRef(param->getName()),
               paramDecl->getDeclContext()->getParentSourceFile(),
               SourceLoc(),
-              UnqualifiedLookupFlags::KnownPrivate |
               UnqualifiedLookupFlags::TypeLookup);
           auto lookup = evaluateOrDefault(
               Context.evaluator, UnqualifiedLookupRequest{descriptor}, {});

lib/Sema/MiscDiagnostics.cpp

@@ -655,8 +655,7 @@ static void diagSyntacticUseRestrictions(const Expr *E, const DeclContext *DC,
 
       DeclContext *topLevelContext = DC->getModuleScopeContext();
       auto descriptor = UnqualifiedLookupDescriptor(
-          DeclNameRef(VD->getBaseName()), topLevelContext, SourceLoc(),
-          UnqualifiedLookupFlags::KnownPrivate);
+          DeclNameRef(VD->getBaseName()), topLevelContext, SourceLoc());
       auto lookup = evaluateOrDefault(Ctx.evaluator,
                                       UnqualifiedLookupRequest{descriptor}, {});
 

lib/Sema/TypeCheckNameLookup.cpp

@@ -207,8 +207,6 @@ namespace {
 static UnqualifiedLookupOptions
 convertToUnqualifiedLookupOptions(NameLookupOptions options) {
   UnqualifiedLookupOptions newOptions = UnqualifiedLookupFlags::AllowProtocolMembers;
-  if (options.contains(NameLookupFlags::KnownPrivate))
-    newOptions |= UnqualifiedLookupFlags::KnownPrivate;
   if (options.contains(NameLookupFlags::IgnoreAccessControl))
     newOptions |= UnqualifiedLookupFlags::IgnoreAccessControl;
   if (options.contains(NameLookupFlags::IncludeOuterResults))
@@ -312,8 +310,6 @@ LookupResult TypeChecker::lookupMember(DeclContext *dc,
 
   LookupResult result;
   NLOptions subOptions = (NL_QualifiedDefault | NL_ProtocolMembers);
-  if (options.contains(NameLookupFlags::KnownPrivate))
-    subOptions |= NL_KnownNonCascadingDependency;
   if (options.contains(NameLookupFlags::IgnoreAccessControl))
     subOptions |= NL_IgnoreAccessControl;
 
@@ -388,8 +384,6 @@ LookupTypeResult TypeChecker::lookupMemberType(DeclContext *dc,
   SmallVector<ValueDecl *, 4> decls;
   NLOptions subOptions = (NL_QualifiedDefault | NL_OnlyTypes | NL_ProtocolMembers);
 
-  if (options.contains(NameLookupFlags::KnownPrivate))
-    subOptions |= NL_KnownNonCascadingDependency;
   if (options.contains(NameLookupFlags::IgnoreAccessControl))
     subOptions |= NL_IgnoreAccessControl;