efriedma added a comment.

Oh, I somehow forgot that was legal. :(  That breaks this whole approach (well, 
maybe the lambda could capture "w", but that seems way too complicated).  So 
we're left with a few possibilities:

1. an error
2. undefined behavior (probably we would want to warn in this case)
3. capturing the address of the thread_local variable


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D66122/new/

https://reviews.llvm.org/D66122



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