Fix for parsing annotations before variables in for-loop with Fasta.

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 f323b4519c356cb29e55355deacd0e461ec1286a..93530ef87fd7096c07ec5fcecdc39533bfe34aae 100644
--- a/pkg/front_end/lib/src/fasta/parser/parser.dart
+++ b/pkg/front_end/lib/src/fasta/parser/parser.dart
@@ -3379,7 +3379,7 @@ class Parser {
     if (identical(value, ';')) {
       listener.handleNoExpression(token);
       return token;
-    } else if (isOneOf3(token, 'var', 'final', 'const')) {
+    } else if (isOneOf4(token, '@', 'var', 'final', 'const')) {
       return parseVariablesDeclarationNoSemicolon(token);
     }
     Token identifier = peekIdentifierAfterType(token);