[PATCH] D147920: [clang] Add test for CWG399

[Vlad Serebrennikov via Phabricator via cfe-commits]

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P1787 <https://wg21.link/p1787>: CWG399 is resolved by explicitly appealing to the lookup for the last component of any suitable nested-name-specifier.
Wording: Otherwise, its nested-name-specifier N shall nominate a type. If N has another nested-name-specifier S, Q is looked up as if its lookup context were that nominated by S. ([basic.lookup.qual]/6.2)

CWG399 revisits a resolution to older CWG244. Our test for CWG244 covers many examples from CWG399, and it was updated in 2020 presumably aware of P1787 <https://reviews.llvm.org/P1787>, so I reused CWG244 test. This approach to reusing was discussed in a CWG405 patch review <https://reviews.llvm.org/D139095>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147920

Files:
  clang/test/CXX/drs/dr2xx.cpp
  clang/test/CXX/drs/dr3xx.cpp
  clang/www/cxx_dr_status.html

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