Rollup merge of #120009 - Nadrieril:never_patterns_tyck, r=compiler-errors

never_patterns: typecheck never patterns

This checks that a `!` pattern is only used on an uninhabited type (modulo match ergonomics, i.e. `!` is allowed on `&Void`).

r? `@compiler-errors`

compiler/rustc_mir_build/src/errors.rs

@@ -788,6 +788,16 @@ pub struct FloatPattern;
 #[diag(mir_build_pointer_pattern)]
 pub struct PointerPattern;
 
+#[derive(Diagnostic)]
+#[diag(mir_build_non_empty_never_pattern)]
+#[note]
+pub struct NonEmptyNeverPattern<'tcx> {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+    pub ty: Ty<'tcx>,
+}
+
 #[derive(LintDiagnostic)]
 #[diag(mir_build_indirect_structural_match)]
 #[note(mir_build_type_not_structural_tip)]

compiler/rustc_mir_build/src/thir/pattern/check_match.rs

@@ -276,10 +276,13 @@ impl<'p, 'tcx> MatchVisitor<'p, 'tcx> {
         } else {
             // Check the pattern for some things unrelated to exhaustiveness.
             let refutable = if cx.refutable { Refutable } else { Irrefutable };
+            let mut err = Ok(());
             pat.walk_always(|pat| {
                 check_borrow_conflicts_in_at_patterns(self, pat);
                 check_for_bindings_named_same_as_variants(self, pat, refutable);
+                err = err.and(check_never_pattern(cx, pat));
             });
+            err?;
             Ok(cx.pattern_arena.alloc(cx.lower_pat(pat)))
         }
     }
@@ -812,6 +815,19 @@ fn check_for_bindings_named_same_as_variants(
     }
 }
 
+/// Check that never patterns are only used on inhabited types.
+fn check_never_pattern<'tcx>(
+    cx: &MatchCheckCtxt<'_, 'tcx>,
+    pat: &Pat<'tcx>,
+) -> Result<(), ErrorGuaranteed> {
+    if let PatKind::Never = pat.kind {
+        if !cx.is_uninhabited(pat.ty) {
+            return Err(cx.tcx.dcx().emit_err(NonEmptyNeverPattern { span: pat.span, ty: pat.ty }));
+        }
+    }
+    Ok(())
+}
+
 fn report_irrefutable_let_patterns(
     tcx: TyCtxt<'_>,
     id: HirId,