Scan generic method comments with Fasta.

pkg/front_end/lib/src/fasta/scanner/precedence.dart

Index: pkg/front_end/lib/src/fasta/scanner/precedence.dart
diff --git a/pkg/front_end/lib/src/fasta/scanner/precedence.dart b/pkg/front_end/lib/src/fasta/scanner/precedence.dart
index 40f96e95500640933369b77e79c3925a57ed1ec1..42a1c252aa30d0153c4588fc14919eb0b0816832 100644
--- a/pkg/front_end/lib/src/fasta/scanner/precedence.dart
+++ b/pkg/front_end/lib/src/fasta/scanner/precedence.dart
@@ -95,6 +95,8 @@ class PrecedenceInfo implements TokenType {
     HEXADECIMAL_INFO,
     SINGLE_LINE_COMMENT_INFO,
     MULTI_LINE_COMMENT_INFO,
+    GENERIC_METHOD_TYPE_ASSIGN,
+    GENERIC_METHOD_TYPE_LIST,
   ];
 
   @override
@@ -396,3 +398,15 @@ const PrecedenceInfo SINGLE_LINE_COMMENT_INFO =
 
 const PrecedenceInfo MULTI_LINE_COMMENT_INFO =
     const PrecedenceInfo('comment', 'MULTI_LINE_COMMENT', 0, COMMENT_TOKEN);
+
+const PrecedenceInfo GENERIC_METHOD_TYPE_ASSIGN = const PrecedenceInfo(
+    'generic_comment_assign',
+    'GENERIC_METHOD_TYPE_ASSIGN',
+    0,
+    GENERIC_METHOD_TYPE_ASSIGN_TOKEN);
+
+const PrecedenceInfo GENERIC_METHOD_TYPE_LIST = const PrecedenceInfo(
+    'generic_comment_list',
+    'GENERIC_METHOD_TYPE_LIST',
+    0,
+    GENERIC_METHOD_TYPE_LIST_TOKEN);