All users were logged out of Bugzilla on October 13th, 2018
It looks like we're relying on std::declval in existing code, e.g. in Skia: https://dxr.mozilla.org/mozilla-central/source/gfx/skia/skia/src/animator/SkMemberInfo.h#115 I suspect this means that we're at the point where mozilla::DeclVal is redundant. Let's remove it and switch existing users over to std::declval.
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