[PATCH] D40144: Implement `std::launder`

[Marshall Clow via Phabricator via cfe-commits]

mclow.lists updated this revision to Diff 123663.
mclow.lists added a comment.

Un-c++17'ed the internal function `__launder`


https://reviews.llvm.org/D40144

Files:
  include/__config
  include/new
  test/std/language.support/support.dynamic/ptr.launder/launder.nodiscard.fail.cpp
  test/std/language.support/support.dynamic/ptr.launder/launder.pass.cpp
  test/std/language.support/support.dynamic/ptr.launder/launder.types.fail.cpp
  www/cxx1z_status.html

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