rustc_lint: Prevent multiple 'incompatible with previous forbid' lints

2023-12-28 18:28:06 +01:00
parent e0c626fbbc
commit 741884dab2
15 changed files with 8 additions and 204 deletions
--- a/compiler/rustc_lint/src/levels.rs
+++ b/compiler/rustc_lint/src/levels.rs
@@ -642,7 +642,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
        //
        // This means that this only errors if we're truly lowering the lint
        // level from forbid.
-        if level != Level::Forbid {
+        if self.lint_added_lints && level != Level::Forbid {
            if let Level::Forbid = old_level {
                // Backwards compatibility check:
                //