Becca Royal-Gordon 78127ce5ee Diagnose possible enum common-prefix mistakes ...

Clang Importer strips prefixes from enum and option set case names. The logic to do this computes a common prefix from the type name and all non-deprecated case names (to oversimplify), which means that adding, removing, or changing one case can change the prefix that is removed from *all* cases. This typically causes the prefix to become shorter, meaning that additional words are prepended to each existing case name.

Existing diagnostics make it look like the case has disappeared, when in fact it still exists under a different name. A little more information may help developers to figure out what happened.

Add a tailored diagnostic for this scenario which kicks in when (a) a missing member is diagnosed, (b) the base is an imported enum or option set’s metatype, and (c) an enum case or static property exists which has the name we attempted to look up as a suffix.

Fixes rdar://116251319.

2023-10-02 16:50:54 -07:00

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