introduce feature gate into never-type test #730
Merged
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Given that we are rolling back stabilization of the never type, this example needs a feature gate. The test was added only recently, by @ehuss -- I think that ordinarily we don't document unstable features, but given that this section of the book seems to be older, and that
!
can appear in some places, and that we hope to get!
stabilized very soon, I opted not to remove it.This needs to land semi-urgently so that rust-lang/rust#67224 can land.