[PATCH] D30597: [libc++] Attempt to improve diagnostics about Hash requirement violations

[Eric Fiselier via Phabricator via cfe-commits]

EricWF created this revision.

This is my attempt to improve the diagnostic messages emitted from the unordered containers when the supplied hash doesn't meet the `Hash` requirements.

Unfortunately producing reasonable diagnostics is tricky and it requires a bunch of meta-programming to get right.

@thakis Does this look more reasonable to you?


https://reviews.llvm.org/D30597

Files:
  include/__hash_table
  include/utility
  test/libcxx/containers/unord/unord.set/missing_hash_specialization.fail.cpp

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