Improve parsing of function expressions.

pkg/front_end/lib/src/fasta/fasta_codes_generated.dart

 // Copyright (c) 2017, 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.
 
 // NOTE: THIS FILE IS GENERATED. DO NOT EDIT.
 //
 // Instead modify 'pkg/front_end/messages.yaml' and run
 // 'pkg/front_end/tool/_fasta/generate_messages.dart' to update.
 
 part of fasta.codes;
@@ skipping 156 matching lines @@
 typedef FastaMessage _YieldNotGenerator(Uri uri, int charOffset);
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 FastaMessage _formatYieldNotGenerator(Uri uri, int charOffset) {
   return new FastaMessage(uri, charOffset, codeYieldNotGenerator,
       message: "'yield' can only be used in 'sync*' or 'async*' methods.",
       arguments: {});
 }
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const FastaCode<_ReturnTypeFunctionExpression>
+    codeReturnTypeFunctionExpression =
+    const FastaCode<_ReturnTypeFunctionExpression>(
+        "ReturnTypeFunctionExpression",
+        template: r"A function expression can't have a return type.",
+        dart2jsCode: "*ignored*",
+        format: _formatReturnTypeFunctionExpression);
+
+typedef FastaMessage _ReturnTypeFunctionExpression(Uri uri, int charOffset);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+FastaMessage _formatReturnTypeFunctionExpression(Uri uri, int charOffset) {
+  return new FastaMessage(uri, charOffset, codeReturnTypeFunctionExpression,
+      message: "A function expression can't have a return type.",
+      arguments: {});
+}
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const FastaCode<_SetterNotSync> codeSetterNotSync =
     const FastaCode<_SetterNotSync>("SetterNotSync",
         template: r"Setters can't use 'async', 'async*', or 'sync*'.",
         dart2jsCode: "*ignored*",
         format: _formatSetterNotSync);
 
 typedef FastaMessage _SetterNotSync(Uri uri, int charOffset);
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 FastaMessage _formatSetterNotSync(Uri uri, int charOffset) {
@@ skipping 641 matching lines @@
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 FastaMessage _formatExpectedButGot(Uri uri, int charOffset, String string) {
   return new FastaMessage(uri, charOffset, codeExpectedButGot,
       message: "Expected '$string' before this.",
       tip: "DONT_KNOW_HOW_TO_FIX,",
       arguments: {'string': string});
 }
 
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const FastaCode<_NamedFunctionExpression> codeNamedFunctionExpression =
+    const FastaCode<_NamedFunctionExpression>("NamedFunctionExpression",
+        template: r"A function expression can't have a name.",
+        dart2jsCode: "*ignored*",
+        format: _formatNamedFunctionExpression);
+
+typedef FastaMessage _NamedFunctionExpression(Uri uri, int charOffset);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+FastaMessage _formatNamedFunctionExpression(Uri uri, int charOffset) {
+  return new FastaMessage(uri, charOffset, codeNamedFunctionExpression,
+      message: "A function expression can't have a name.", arguments: {});
+}
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const FastaCode<_ConstFieldWithoutInitializer>
     codeConstFieldWithoutInitializer =
     const FastaCode<_ConstFieldWithoutInitializer>(
         "ConstFieldWithoutInitializer",
         template: r"A 'const' field must be initialized.",
         tip: r"Try adding '= <initializer>'.",
         dart2jsCode: "*ignored*",
         format: _formatConstFieldWithoutInitializer);
 
 typedef FastaMessage _ConstFieldWithoutInitializer(Uri uri, int charOffset);
@@ skipping 273 matching lines @@
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 FastaMessage _formatNonAsciiIdentifier(
     Uri uri, int charOffset, String character, int codePoint) {
   String unicode = "(U+${codePoint.toRadixString(16).padLeft(4, '0')})";
   return new FastaMessage(uri, charOffset, codeNonAsciiIdentifier,
       message:
           "The non-ASCII character '$character' ($unicode) can't be used in identifiers, only in strings and comments.",
       tip: "Try using an US-ASCII letter, a digit, '_' (an underscore), or '\$' (a dollar sign).",
       arguments: {'character': character, 'codePoint': codePoint});
 }