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...a couple of reasons: 1) It makes back-reference syntax ugly. "{0} {1} {0}" is much clearer to me than "%0$ %1$ %0$". The latter syntax is also not a very well known feature of printf and so unlikely to be used by people with a printf-style implementation, whereas it's un-missable with the python-style syntax. 2) I don't see why we should need to specify the type of the argument with %d if the compiler knows it's an integer. Even if the we can add compile-time checking to make it error, it seems unnecessary to even encounter this situation in the first place. I b...

On Mon, Oct 31, 2016 at 5:21 PM, Chandler Carruth via llvm-dev < llvm-dev at lists.llvm.org> wrote: > On Mon, Oct 31, 2016 at 3:46 PM Zachary Turner via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > >> Hi all, >> >> Tentatively final version is up here: https://reviews.llvm.org/D25587 >> >> It has a verbal LGTM, but I plan to wait a bit