Move safe intrinsic tests

crates/hir_def/src/item_tree/tests.rs

@@ -437,23 +437,3 @@ fn assoc_item_macros() {
         "#]],
     );
 }
-
-#[test]
-fn safe_intrinsic() {
-    check(
-        r"
-        #![feature(core_intrinsics)]
-
-        fn reverse(input: u32) -> u32 {
-            std::intrinsics::bitreverse(input)
-        }
-    ",
-        expect![[r#"
-            inner attrs: Attrs { entries: Some([Attr { path: ModPath { kind: Plain, segments: [Name(Text("feature"))] }, input: Some(TokenTree(SUBTREE () 0
-              IDENT   core_intrinsics 1)) }]) }
-
-            top-level items:
-            Function { name: Name(Text("reverse")), visibility: RawVisibilityId("pub(self)"), generic_params: GenericParamsId(4294967295), has_self_param: false, has_body: true, is_unsafe: false, params: [Path(Path { type_anchor: None, mod_path: ModPath { kind: Plain, segments: [Name(Text("u32"))] }, generic_args: [None] })], is_varargs: false, ret_type: Path(Path { type_anchor: None, mod_path: ModPath { kind: Plain, segments: [Name(Text("u32"))] }, generic_args: [None] }), ast_id: FileAstId::<syntax::ast::generated::nodes::Fn>(0) }
-        "#]],
-    );
-}

crates/hir_ty/src/diagnostics/unsafe_check.rs

@@ -199,6 +199,24 @@ fn main() {
         let x = STATIC_MUT.a;
     }
 }
+"#,
+        );
+    }
+
+    #[test]
+    fn no_missing_unsafe_diagnostic_with_safe_intrinsic() {
+        check_diagnostics(
+            r#"
+extern "rust-intrinsic" {
+    pub fn bitreverse(x: u32) -> u32; // Safe intrinsic
+    pub fn floorf32(x: f32) -> f32; // Unsafe intrinsic
+}
+
+fn main() {
+    let _ = bitreverse(12);
+    let _ = floorf32(12.0);
+          //^^^^^^^^^^^^^^ This operation is unsafe and requires an unsafe function or block
+}
 "#,
         );
     }