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Rollup merge of #125596 - nnethercote:rental-hard-error, r=estebank

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Convert `proc_macro_back_compat` lint to an unconditional error.

We still check for the `rental`/`allsorts-rental` crates. But now if they are detected we just emit a fatal error, instead of emitting a warning and providing alternative behaviour.

The original "hack" implementing alternative behaviour was added in #73345.

The lint was added in #83127.

The tracking issue is #83125.

The direct motivation for the change is that providing the alternative behaviour is interfering with #125174 and follow-on work.

r? ``@estebank``
This commit is contained in:
Guillaume Gomez 2024-06-04 21:41:33 +02:00 • committed by GitHub
commit fa96e2cb4f
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8
compiler/rustc_lint/src/lints.rs
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@ -2649,14 +2649,6 @@ pub struct LegacyDeriveHelpers {
pub span: Span,
}
#[derive(LintDiagnostic)]
#[diag(lint_proc_macro_back_compat)]
#[note]
pub struct ProcMacroBackCompat {
pub crate_name: String,
pub fixed_version: String,
}
#[derive(LintDiagnostic)]
#[diag(lint_or_patterns_back_compat)]
pub struct OrPatternsBackCompat {