Bugfix :: Flexible types should subsume nullable version of equivalent CoarcesTo constraints #18266
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Fixes #18056
When using
#IDisposable
, it should subsume any nullable as well as non-nullable version of the head types (following the inheritance hiearchy).When using
#IDisposable | null
as the flexible type, it should subsume nullable versions of any of the types in the hierarchy, and warn on when passed to non-nullable parameters.Before this fix, a warning was always emitted from an internal compiler call to enforce constraint consistency.