Teach transmute_{ref,mut}! to handle slice DSTs #1924
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TODO: - Figure out how to make this backwards-compatible (since current macros work with `T: Sized`, but `T: Sized` does not imply `T: KnownLayout`) - Make it so that `Sized` bounds are still enforced on older toolchains that don't support slice DST transmutes - Write safety comments - Get rid of now-unused macros and functions in util::macro_util Makes progress on #1817 gherrit-pr-id: Ib4bc62202e0b3b09d155333b525087f7aa8f02c2
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TODO:
T: Sized, butT: Sizeddoes not implyT: KnownLayout)Sizedbounds are still enforced on older toolchains that don't support slice DST transmutesMakes progress on #1817
gherrit-pr-id: Ib4bc62202e0b3b09d155333b525087f7aa8f02c2