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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/messages.ftl
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@ -629,9 +629,6 @@ lint_pattern_in_foreign = patterns aren't allowed in foreign function declaratio
lint_private_extern_crate_reexport =
extern crate `{$ident}` is private, and cannot be re-exported, consider declaring with `pub`
lint_proc_macro_back_compat = using an old version of `{$crate_name}`
.note = older versions of the `{$crate_name}` crate will stop compiling in future versions of Rust; please update to `{$crate_name}` v{$fixed_version}, or switch to one of the `{$crate_name}` alternatives
lint_proc_macro_derive_resolution_fallback = cannot find {$ns} `{$ident}` in this scope
.label = names from parent modules are not accessible without an explicit import