rustc-ap-rustc_errors 542.0.0

Automatically published version of the package `rustc_errors` in the rust-lang/rust repository from commit 8b94e9e9188b65df38a5f1ae723617dc2dfb3155 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
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Diagnostics creation and emission for rustc.

This module contains the code for creating and emitting diagnostics.