Fix spec to allow `x == null` in const expression where `x` is not num/string/bool/null. See issue #31140 Bug: http://dartbug.com/31140 Change-Id: I141cc3856a1758313de102084f74f4fa41412586 Reviewed-on: https://dart-review.googlesource.com/15100 Commit-Queue: Lasse R.H. Nielsen <lrn@google.com> Reviewed-by: Erik Ernst <eernst@google.com>
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