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Convert proc_macro_back_compat lint to an unconditional error.

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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.
This commit is contained in:
Nicholas Nethercote
2024-05-27 09:00:48 +10:00
parent 3607cee3e7
commit cf0c2c7333
14 changed files with 54 additions and 570 deletions
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3
compiler/rustc_lint/src/context/diagnostics.rs
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@@ -159,9 +159,6 @@ pub(super) fn decorate_lint(sess: &Session, diagnostic: BuiltinLintDiag, diag: &
BuiltinLintDiag::LegacyDeriveHelpers(label_span) => {
lints::LegacyDeriveHelpers { span: label_span }.decorate_lint(diag);
}
BuiltinLintDiag::ProcMacroBackCompat { crate_name, fixed_version } => {
lints::ProcMacroBackCompat { crate_name, fixed_version }.decorate_lint(diag);
}
BuiltinLintDiag::OrPatternsBackCompat(suggestion_span, suggestion) => {
lints::OrPatternsBackCompat { span: suggestion_span, suggestion }.decorate_lint(diag);
}