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introduce negative_impls feature gate and document

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They used to be covered by `optin_builtin_traits` but negative impls
are now applicable to all traits, not just auto traits.

This also adds docs in the unstable book for the current state of auto traits.
This commit is contained in:
Niko Matsakis 2020-01-09 05:56:38 -05:00
parent 65071708f8
commit fda3378e3f
102 changed files with 330 additions and 111 deletions
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src/libstd/lib.rs
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@ -278,6 +278,7 @@
#![feature(maybe_uninit_ref)]
#![feature(maybe_uninit_slice)]
#![feature(needs_panic_runtime)]
#![cfg_attr(not(bootstrap), feature(negative_impls))]
#![feature(never_type)]
#![feature(nll)]
#![feature(optin_builtin_traits)]