[semantic errors] Stabilize semantic errors (#18523)

Author: dylwil3

crates/ruff_linter/src/checkers/ast/mod.rs

@@ -65,7 +65,7 @@ use crate::docstrings::extraction::ExtractionTarget;
 use crate::importer::{ImportRequest, Importer, ResolutionError};
 use crate::noqa::NoqaMapping;
 use crate::package::PackageRoot;
-use crate::preview::{is_semantic_errors_enabled, is_undefined_export_in_dunder_init_enabled};
+use crate::preview::is_undefined_export_in_dunder_init_enabled;
 use crate::registry::{AsRule, Rule};
 use crate::rules::pyflakes::rules::{
     LateFutureImport, ReturnOutsideFunction, YieldOutsideFunction,
@@ -663,9 +663,7 @@ impl SemanticSyntaxContext for Checker<'_> {
             | SemanticSyntaxErrorKind::AsyncComprehensionInSyncComprehension(_)
             | SemanticSyntaxErrorKind::DuplicateParameter(_)
             | SemanticSyntaxErrorKind::NonlocalDeclarationAtModuleLevel => {
-                if is_semantic_errors_enabled(self.settings) {
-                    self.semantic_errors.borrow_mut().push(error);
-                }
+                self.semantic_errors.borrow_mut().push(error);
             }
         }
     }

crates/ruff_linter/src/preview.rs

@@ -7,12 +7,6 @@
 
 use crate::settings::LinterSettings;
 
-// https://github.com/astral-sh/ruff/issues/17412
-// https://github.com/astral-sh/ruff/issues/11934
-pub(crate) const fn is_semantic_errors_enabled(settings: &LinterSettings) -> bool {
-    settings.preview.is_enabled()
-}
-
 pub(crate) const fn is_py314_support_enabled(settings: &LinterSettings) -> bool {
     settings.preview.is_enabled()
 }