Go: Fix missing promoted fields due to name clash #18001
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NCField should be promoted to EmbedsNameClash. Currently it isn't because its embedded parent pkg2.NameClash is not a promoted field in EmbedsNameClash (because of a name clash with pkg1.NameClash), but this should not make a difference.
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| depth = min(int depthCand | exists(this.getFieldCand(name, depthCand, _))) and | ||
| result = this.getFieldCand(name, depth, _) and | ||
| strictcount(this.getFieldCand(name, depth, _)) = 1 | ||
| depth = min(int depthCand | exists(Field f | this.hasFieldCand(name, f, depthCand, _))) and |
Check warning
Code scanning / CodeQL
Omittable 'exists' variable Warning
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When two embedded fields at different depths have the same name (but are not the same type - they are in different packages and happen to have the same name) then we don't treat the second one correctly and we don't promote any of its fields or methods. This turns out to be because of a condition that was added to avoid non-termination on cyclic structs in github/codeql-go#184 which only checked the name of the embedded field. The fix is to also check the type.
While looking into this I noticed that we have two different predicates for calculating field candidates. This PR includes a refactoring to remove the redundancy and make the code easier to understand.