Ping? On Mon, May 28, 2012 at 6:33 PM, Aaron Ballman <[email protected]> wrote: > On Thu, May 24, 2012 at 10:36 AM, Aaron Ballman <[email protected]> > wrote: >> On Thu, May 24, 2012 at 12:50 AM, Richard Smith <[email protected]> >> wrote: >>> On Tue, May 22, 2012 at 6:54 PM, Aaron Ballman <[email protected]> >>> wrote: >>>> >>>> When a lambda expression omits the return type information, the >>>> standard requires the lambda statement body to be a single return >>>> statement. However, as a language extension, we (and several other >>>> compilers) support determining the return type if all of the >>>> function's return types agree. >>>> >>>> The problem is, the wording for the warning we emit is a bit difficult >>>> to parse. It's a semantically correct statement, but it's not >>>> immediately obvious what the problem is or how to rectify it. >>>> Consider: >>>> >>>> auto i = []() { static const int foo = 12; return &foo; }(); >>>> >>>> This will emit a diagnostic that says "C++11 requires lambda with >>>> omitted result type to consist of a single return statement" -- >>>> however, a likely initial response to this is "but I do only have a >>>> single return statement!" >>>> >>>> This patch rewords the diagnostic to be a bit more clear (hopefully): >>>> "C++11 requires a lambda expression with omitted result type to >>>> consist solely of a return statement" >>>> >>>> Thoughts? >>> >>> >>> I would be in favor of removing the warning entirely, now that Clang 3.1 has >>> shipped. The C++ core working group has already agreed that this should be >>> allowed. It's currently under consideration by the evolution working group, >>> whom I think are unlikely to say no -- and if they do, we will have time to >>> react before 3.2 is released. >> >> That would certainly work as well -- is there a general preference one >> way or the other? >> >> ~Aaron > > Here is a patch that removes the warning entirely as per Richard's > suggestion -- any objections? > > ~Aaron
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