[PATCH] D124351: [Clang] Implement Change scope of lambda trailing-return-type

[Jordan Rupprecht via Phabricator via cfe-commits]

rupprecht added a comment.

Hi, me again :)

I ran into an interesting build breakage from this, I can't tell if it's a 
legitimate breakage based on reading P2036R3 and P2579R0 (mostly I'm not a 
language lawyer).

  struct StringLiteral {
    template <int N>
    StringLiteral(const char (&array)[N])
        __attribute__((enable_if(N > 0 && N == __builtin_strlen(array) + 1,
                                 "invalid string literal")));
  };
  
  struct Message {
    Message(StringLiteral);
  };
  
  void Func1() {
    auto x = Message("x");  // Note: this is fine
  
    // Note: "xx\0" to force a different type, StringLiteral<3>, otherwise this
    // successfully builds.
    auto y = [&](decltype(Message("xx"))) {};
  
    // ^ fails with: repro.cc:18:13: error: reference to local variable 'array'
    // declared in enclosing function 'StringLiteral::StringLiteral<3>'
  
    (void)x;
    (void)y;
  }

https://godbolt.org/z/M4E6jKxxn

Does this look like an intended breakage from this patch?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D124351/new/

https://reviews.llvm.org/D124351

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