Remove -enable-protocol-typealiases staging flag

include/swift/AST/DiagnosticsParse.def

@@ -778,8 +778,6 @@ ERROR(expected_close_after_else_directive,none,
       "further conditions after #else are unreachable", ())
 
 /// Associatedtype Statement
-WARNING(typealias_in_protocol_deprecated,none,
-      "use of 'typealias' to declare associated types is deprecated; use 'associatedtype' instead", ())
 ERROR(typealias_inside_protocol_without_type,none,
       "typealias is missing an assigned type; use 'associatedtype' to define an associated type requirement", ())
 ERROR(associatedtype_outside_protocol,none,

include/swift/Basic/LangOptions.h

@@ -170,9 +170,6 @@ namespace swift {
     /// Enable the Swift 3 migration via Fix-Its.
     bool Swift3Migration = false;
 
-    /// Enable typealiases in protocols.
-    bool EnableProtocolTypealiases = false;
-
     /// Sets the target we are building for and updates platform conditions
     /// to match.
     ///

include/swift/Option/FrontendOptions.td

@@ -352,9 +352,6 @@ def enable_resilience : Flag<["-"], "enable-resilience">,
 def group_info_path : Separate<["-"], "group-info-path">,
   HelpText<"The path to collect the group information of the compiled module">;
 
-def enable_protocol_typealiases: Flag<["-"], "enable-protocol-typealiases">,
-  HelpText<"Enable typealiases inside protocol declarations">;
-
 def enable_id_as_any: Flag<["-"], "enable-id-as-any">,
   HelpText<"Enable importing ObjC 'id' as Swift 'Any' type">;
 

lib/Frontend/CompilerInvocation.cpp

@@ -778,7 +778,6 @@ static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
   Opts.InferImportAsMember |= Args.hasArg(OPT_enable_infer_import_as_member);
 
   Opts.EnableThrowWithoutTry |= Args.hasArg(OPT_enable_throw_without_try);
-  Opts.EnableProtocolTypealiases |= Args.hasArg(OPT_enable_protocol_typealiases);
   Opts.EnableIdAsAny |= Args.hasArg(OPT_enable_id_as_any);
 
   if (auto A = Args.getLastArg(OPT_enable_objc_attr_requires_foundation_module,

lib/Parse/ParseDecl.cpp

@@ -2083,12 +2083,7 @@ ParserStatus Parser::parseDecl(ParseDeclOptions Flags,
       break;
     }
     case tok::kw_typealias:
-      if (Flags.contains(PD_InProtocol) &&
-          !Context.LangOpts.EnableProtocolTypealiases) {
-        DeclResult = parseDeclAssociatedType(Flags, Attributes);
-      } else {
-        DeclResult = parseDeclTypeAlias(Flags, Attributes);
-      }
+      DeclResult = parseDeclTypeAlias(Flags, Attributes);
       Status = DeclResult;
       break;
     case tok::kw_associatedtype:
@@ -2979,10 +2974,7 @@ ParserResult<TypeDecl> Parser::parseDeclAssociatedType(Parser::ParseDeclOptions
   // ask us to fix up leftover Swift 2 code intending to be an associatedtype.
   if (Tok.is(tok::kw_typealias)) {
     AssociatedTypeLoc = consumeToken(tok::kw_typealias);
-    auto diagnosis = Context.LangOpts.EnableProtocolTypealiases ?
-      diag::typealias_inside_protocol_without_type :
-      diag::typealias_in_protocol_deprecated;
-    diagnose(AssociatedTypeLoc, diagnosis)
+    diagnose(AssociatedTypeLoc, diag::typealias_inside_protocol_without_type)
         .fixItReplace(AssociatedTypeLoc, "associatedtype");
   } else {
     AssociatedTypeLoc = consumeToken(tok::kw_associatedtype);

lib/Sema/TypeCheckType.cpp

@@ -651,6 +651,10 @@ static Type resolveTypeDecl(TypeChecker &TC, TypeDecl *typeDecl, SourceLoc loc,
   } else {
     // Validate the declaration.
     TC.validateDecl(typeDecl);
+
+    // FIXME: More principled handling of circularity.
+    if (!isa<AssociatedTypeDecl>(typeDecl) && !typeDecl->hasType())
+      return ErrorType::get(TC.Context);
   }
 
   // Resolve the type declaration to a specific type. How this occurs

test/Generics/associated_types.swift

@@ -173,7 +173,7 @@ struct C<a : B> : B { // expected-error {{type 'C<a>' does not conform to protoc
 
 // SR-511
 protocol sr511 {
-  typealias Foo // expected-warning {{use of 'typealias' to declare associated types is deprecated; use 'associatedtype' instead}} 
+  typealias Foo // expected-error {{typealias is missing an assigned type; use 'associatedtype' to define an associated type requirement}}
 }
 
 associatedtype Foo = Int // expected-error {{associated types can only be defined in a protocol; define a type or introduce a 'typealias' to satisfy an associated type requirement}}

test/decl/typealias/protocol.swift

@@ -1,4 +1,4 @@
-// RUN: %target-parse-verify-swift -enable-protocol-typealiases
+// RUN: %target-parse-verify-swift
 
 // Tests for typealias inside protocols
 

utils/resolve-crashes.py

@@ -15,15 +15,15 @@ def execute_cmd(cmd):
 
 # The regular expression we use to match compiler-crasher lines.
 regex = re.compile(
-    '.*Swift :: '
+    '.*Swift(.*) :: '
     '(compiler_crashers|compiler_crashers_2|IDE/crashers)/(.*\.swift).*')
 
 # Take the output of lit as standard input.
 for line in sys.stdin:
     match = regex.match(line)
     if match:
-        suffix = match.group(1)
-        filename = match.group(2)
+        suffix = match.group(2)
+        filename = match.group(3)
 
         # Move the test over to the fixed suite.
         from_filename = 'validation-test/%s/%s' % (suffix, filename)

validation-test/compiler_crashers/28268-swift-type-transform.swift → validation-test/compiler_crashers_fixed/28268-swift-type-transform.swift

@@ -5,6 +5,6 @@
 // See http://swift.org/LICENSE.txt for license information
 // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 
-// RUN: not --crash %target-swift-frontend %s -parse
+// RUN: not %target-swift-frontend %s -parse
 var:{protocol a{struct A:a
 typealias e=A.e

validation-test/compiler_crashers/28333-swift-typedecl-getdeclaredtype.swift → validation-test/compiler_crashers_fixed/28333-swift-typedecl-getdeclaredtype.swift

@@ -5,7 +5,7 @@
 // See http://swift.org/LICENSE.txt for license information
 // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 
-// RUN: not --crash %target-swift-frontend %s -parse
+// RUN: not %target-swift-frontend %s -parse
 // REQUIRES: asserts
 protocol c{{}
 func c:f.a

validation-test/compiler_crashers/28360-swift-archetypebuilder-maptypeoutofcontext.swift → validation-test/compiler_crashers_fixed/28360-swift-archetypebuilder-maptypeoutofcontext.swift

@@ -5,6 +5,6 @@
 // See http://swift.org/LICENSE.txt for license information
 // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 
-// RUN: not --crash %target-swift-frontend %s -parse
+// RUN: not %target-swift-frontend %s -parse
 // REQUIRES: asserts
 struct A<f{protocol a{typealias f=B}struct B{let c=A.a as a

validation-test/compiler_crashers/28364-swift-typechecker-addimplicitconstructors.swift → validation-test/compiler_crashers_fixed/28364-swift-typechecker-addimplicitconstructors.swift

@@ -5,7 +5,7 @@
 // See http://swift.org/LICENSE.txt for license information
 // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 
-// RUN: not --crash %target-swift-frontend %s -parse
+// RUN: not %target-swift-frontend %s -parse
 // REQUIRES: asserts
 {
 protocol d{