[PATCH] D78660: [SemaObjC] Add a warning for dictionary literals with duplicate keys

[Erik Pilkington via Phabricator via cfe-commits]

erik.pilkington created this revision.
erik.pilkington added reviewers: rjmccall, bendjones.
Herald added subscribers: ributzka, dexonsmith, jkorous.

Duplicate keys in a literal break NSDictionary's invariants.

Fixes rdar://50454461


Repository:
  rC Clang

https://reviews.llvm.org/D78660

Files:
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/Sema/SemaExprObjC.cpp
  clang/test/SemaObjC/dictionary-literal-duplicates.m

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