[Issue 21505] Function alias reported as conflicting function

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21505

--- Comment #3 from Dlang Bot <dlang-bot at dlang.rocks> ---
dlang/dmd pull request #12195 "Merge stable" was merged into master:

- 41fa5138bc8aebcf9ab4870c4df19e42e1f97d80 by Florian:
  Fix 21505 - Rework duplicate function detection without mangling (#12053)

  The previous implementation compared small parts of the function mangling
  to detect duplicate functions. This approach had several flaws manifesting
  in the referenced issue as well as other false positives for (static)
  members, `alias`ing into different scopes, ... .

  Issue 21505 was caused by the assumption that all functions visited by
  `overloadApply` have the same name. This doesn't hold for overloads
  introduced by an `alias`.

  A reliable mangling-based implementation would need to compare most of
  the mangled name while also omitting severel aspects e.g. the return type
  to detect `int foo()` and `void foo()`.

  Hence the current implementation was replaced by actually comparing the
  `FuncDeclaration`s because it allows for more fine grained checks (and
  also should save some memory allocations).

https://github.com/dlang/dmd/pull/12195

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