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Auto merge of #99917 - yaahc:error-in-core-move, r=thomcc

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Move Error trait into core

This PR moves the error trait from the standard library into a new unstable `error` module within the core library. The goal of this PR is to help unify error reporting across the std and no_std ecosystems, as well as open the door to integrating the error trait into the panic reporting system when reporting panics whose source is an errors (such as via `expect`).

This PR is a rewrite of https://github.com/rust-lang/rust/pull/90328 using new compiler features that have been added to support error in core.
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bors 2022-08-23 19:48:55 +00:00
commit 060e47f74a
25 changed files with 1264 additions and 226 deletions
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3
library/std/src/lib.rs
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@ -281,6 +281,9 @@
#![feature(cstr_internals)]
#![feature(duration_checked_float)]
#![feature(duration_constants)]
#![cfg_attr(not(bootstrap), feature(error_generic_member_access))]
#![cfg_attr(not(bootstrap), feature(error_in_core))]
#![cfg_attr(not(bootstrap), feature(error_iter))]
#![feature(exact_size_is_empty)]
#![feature(exclusive_wrapper)]
#![feature(extend_one)]