Louis Dionne c90dee1e90 [libc++] Re-apply fdc41e11f (LWG1203) without breaking the C++11 build
fdc41e11f was reverted in e46c1def5 because it broke the C++11 build.
We shouldn't be using enable_if_t in C++11, instead we must use
enable_if<...>::type.
2020-09-23 08:56:00 -04:00
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