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* Add -Wmissing-exported-pattern-synonym-signaturesThomas Winant2021-05-291-23/+8
| | | | | | | | | | | | | After !4741, it was no longer possible to silence a warning about a missing pattern synonym signature if the `-Wmissing-signatures` flag was on. Restore the previous semantics while still adhering to the principle "enabling an additional warning flag should never make prior warnings disappear". For more symmetry and granularity, introduce `-Wmissing-exported-pattern-synonym-signatures`. See Note [Missing signatures] for an overview of all flags involved.
* Prefer -Wmissing-signatures over -Wmissing-exported-signatures (#14794)Michiel de Bruijne2021-02-221-0/+31