Implement metadata on methods and fields.

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

Index: pkg/front_end/lib/src/fasta/parser/parser.dart
diff --git a/pkg/front_end/lib/src/fasta/parser/parser.dart b/pkg/front_end/lib/src/fasta/parser/parser.dart
index 42c8f456f4cbb2b5f8d090e106360e994ac9c1cf..489ecd44e5a6055ba63885207cf394157d1977f0 100644
--- a/pkg/front_end/lib/src/fasta/parser/parser.dart
+++ b/pkg/front_end/lib/src/fasta/parser/parser.dart
@@ -44,6 +44,7 @@ import '../fasta_codes.dart'
         codeInvalidInlineFunctionType,
         codeInvalidSyncModifier,
         codeInvalidVoid,
+        codeMetadataTypeArguments,
         codeNoFormals,
         codeNonAsciiIdentifier,
         codeNonAsciiWhitespace,
@@ -590,6 +591,9 @@ class Parser {
     token = parseIdentifier(token.next, IdentifierContext.metadataReference);
     token =
         parseQualifiedRestOpt(token, IdentifierContext.metadataContinuation);
+    if (optional("<", token)) {
+      reportRecoverableErrorCode(token, codeMetadataTypeArguments);
+    }
     token = parseTypeArgumentsOpt(token);
     Token period = null;
     if (optional('.', token)) {