Generate type variable events before parsing return type.

pkg/front_end/lib/src/fasta/source/outline_builder.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library fasta.outline_builder;
 
 import 'package:kernel/ast.dart' show ProcedureKind;
 
 import '../fasta_codes.dart' show FastaMessage, codeExpectedBlockToSkip;
 
@@ skipping 598 matching lines @@
   void beginFunctionTypeAlias(Token token) {
     library.beginNestedDeclaration(null, hasMembers: false);
     silenceParserErrors = false;
   }
 
   @override
   void endFunctionType(Token functionToken, Token endToken) {
     debugEvent("FunctionType");
     List<FormalParameterBuilder> formals = pop();
     pop(); // formals offset
+    TypeBuilder returnType = pop();
     List<TypeVariableBuilder> typeVariables = pop();
-    TypeBuilder returnType = pop();
     push(library.addFunctionType(
         returnType, typeVariables, formals, functionToken.charOffset));
   }
 
   @override
   void endFunctionTypeAlias(
       Token typedefKeyword, Token equals, Token endToken) {
     debugEvent("endFunctionTypeAlias");
     List<FormalParameterBuilder> formals;
     List<TypeVariableBuilder> typeVariables;
@@ skipping 228 matching lines @@
   Link<Token> handleMemberName(Link<Token> identifiers) {
     if (!enableNative || identifiers.isEmpty) return identifiers;
     return removeNativeClause(identifiers);
   }
 
   @override
   void debugEvent(String name) {
     // printEvent(name);
   }
 }