fix #25739, incorrectly expanding a generic comment multiple times

pkg/analyzer/lib/src/generated/parser.dart

Index: pkg/analyzer/lib/src/generated/parser.dart
diff --git a/pkg/analyzer/lib/src/generated/parser.dart b/pkg/analyzer/lib/src/generated/parser.dart
index 3aaa54f0d37b33be2e2db31cedde8210652bd752..805ad6e584263b3fabd4651e688a04d69c49ced5 100644
--- a/pkg/analyzer/lib/src/generated/parser.dart
+++ b/pkg/analyzer/lib/src/generated/parser.dart
@@ -3951,6 +3951,8 @@ class Parser {
           String comment = t.lexeme.substring(prefixLen, t.lexeme.length - 2);
           Token list = _scanGenericMethodComment(comment, t.offset + prefixLen);
           if (list != null) {
+            // Remove the tokens from the comment stream.

[Bob Nystrom, 2016/02/18 16:58:58]

Nit: "tokens" -> "token".

The overall effect of the outer loop is to remove them all, but the line here
just removes the one.

+            t.remove();
             // Insert the tokens into the stream.
             _injectTokenList(list);
             return true;