5cebb0f980
The declaration `extension type on(int i,) {}` is ambiguous: It can
be an extension named `type` or an extension type named `on`. This
CL adjusts the specification grammar Dart.g such that it is
disambiguated in favor of being an extension type.
See https://github.com/dart-lang/language/issues/3258 for details.
Change-Id: I74f800a75c6c5061675c345c546a85cff046d27f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/332243
Reviewed-by: William Hesse <whesse@google.com>
Commit-Queue: Erik Ernst <eernst@google.com>