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Auto merge of #80851 - m-ou-se:panic-2021, r=petrochenkov

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Implement Rust 2021 panic

This implements the Rust 2021 versions of `panic!()`. See https://github.com/rust-lang/rust/issues/80162 and https://github.com/rust-lang/rfcs/pull/3007.

It does so by replacing `{std, core}::panic!()` by a bulitin macro that expands to either `$crate::panic::panic_2015!(..)` or `$crate::panic::panic_2021!(..)` depending on the edition of the caller.

This does not yet make std's panic an alias for core's panic on Rust 2021 as the RFC proposes. That will be a separate change: c5273bdfb2 That change is blocked on figuring out what to do with https://github.com/rust-lang/rust/issues/80846 first.
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bors 2021-02-01 10:25:31 +00:00
commit e0d9f79399
26 changed files with 596 additions and 429 deletions
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library/std/src/lib.rs
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@ -259,6 +259,7 @@
#![feature(dropck_eyepatch)]
#![feature(duration_constants)]
#![feature(duration_zero)]
#![feature(edition_panic)]
#![feature(exact_size_is_empty)]
#![feature(exhaustive_patterns)]
#![feature(extend_one)]