Rollup merge of #126973 - chenyukang:yukang-fix-126756-unsafe-suggestion-error, r=spastorino

Fix bad replacement for unsafe extern block suggestion

Fixes #126756

r? ``@spastorino``

link #123743

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -464,7 +464,7 @@ impl<'a> AstValidator<'a> {
                 {
                     self.dcx().emit_err(errors::InvalidSafetyOnExtern {
                         item_span: span,
-                        block: self.current_extern_span(),
+                        block: self.current_extern_span().shrink_to_lo(),
                     });
                 }
             }