add test that repros issue #47338 This currently fails for the CFE with: static error failures: - Unexpected error at line 137, column 14: A value of type 'int?' can't be assigned to a variable of type 'int' because 'int?' is nullable and 'int' isn't. - Unexpected error at line 137, column 25: Operand of null-aware operation '!' has type 'int' which excludes null. Bug: https://github.com/dart-lang/sdk/issues/47338 Change-Id: Ia55e19a0bf296a8427f6510d6ddda5016acdecea Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/215101 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Jake Macdonald <jakemac@google.com>
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