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fc01a4a7c8
The default value of the ResultT template argument (which was there only to avoid spelling out the long std::result_of template multiple times) was being overriden by function call template argument deduction. This manifested itself as a compiler error when calling the function as FILE *X = RetryAfterSignal(nullptr, fopen, ...) because the function would try to assign the result of fopen to nullptr_t, but a more insidious side effect was that RetryAfterSignal(-1, read, ...) would return "int" instead of "ssize_t", losing precision along the way. I fix this by having the function take the argument in a way that prevents argument deduction from kicking in and add a test that makes sure the return type is correct. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306003 91177308-0d34-0410-b5e6-96231b3b80d8
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