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Rollup merge of #101976 - RalfJung:mir-semantic-phases, r=oli-obk

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MirPhase: clarify that linting is not a semantic change

r? ```@JakobDegen```
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Michael Howell 2022-09-20 10:12:58 -07:00 committed by GitHub
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7
compiler/rustc_middle/src/mir/syntax.rs
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@ -82,9 +82,10 @@ pub enum MirPhase {
/// access to. This occurs in generator bodies. Such locals do not behave like other locals,
/// because they eg may be aliased in surprising ways. Runtime MIR has no such special locals -
/// all generator bodies are lowered and so all places that look like locals really are locals.
/// - Const prop lints: The lint pass which reports eg `200_u8 + 200_u8` as an error is run as a
/// part of analysis to runtime MIR lowering. This means that transformations which may supress
/// such errors may not run on analysis MIR.
///
/// Also note that the lint pass which reports eg `200_u8 + 200_u8` as an error is run as a part
/// of analysis to runtime MIR lowering. To ensure lints are reported reliably, this means that
/// transformations which may supress such errors should not run on analysis MIR.
Runtime(RuntimePhase),
}