Fix broken nightly: Const fn union workaround#52

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XOSplicer wants to merge 4 commits intorust-embedded:masterfrom

XOSplicer:const-fn-union-workaround

Commits on Aug 14, 2018

Add #![feature(const_fn_union)] when needed
whentze
authored

Commits on Aug 17, 2018

WIP workaround
Felix Stegmaier
committed
always uninit
Felix Stegmaier
committed
no-default-features friendly uninit
Felix Stegmaier
committed