Tests.

test/libsolidity/memoryGuardTests/comment/free_function.sol

@@ -0,0 +1,29 @@
+function safe() pure returns (uint256 x) {
+    assembly { x := 42 }
+    /// @solidity memory-safe-assembly
+    assembly { mstore(0, 0) }
+}
+function unsafe() pure returns (uint256 x) {
+    assembly { pop(mload(0)) }
+}
+contract C {
+    constructor() {
+        unsafe();
+    }
+    function f() public pure {
+        safe();
+    }
+}
+contract D {
+    constructor() {
+        safe();
+    }
+    function f() public pure {
+        unsafe();
+    }
+}
+// ----
+// :C(creation) false
+// :C(runtime) true
+// :D(creation) true
+// :D(runtime) false