Bound functions.

test/cmdlineTests/yul_unimplemented/err

@@ -1,5 +1,5 @@
 Error (1834): Unimplemented feature error in <FILENAME REMOVED>
- --> yul_unimplemented/input.sol:8:9:
+ --> yul_unimplemented/input.sol:5:16:
   |
-8 |         x.f();
-  |         ^^^^^
+5 |         return type(test).name;
+  |                ^^^^^^^^^^^^^^^

test/cmdlineTests/yul_unimplemented/input.sol

@@ -1,10 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0
 pragma solidity >=0.0;
-library L { function f(uint) public {} }
 contract test {
-    using L for uint;
-    function f() public {
-        uint x;
-        x.f();
+    function f() public pure returns (string memory) {
+        return type(test).name;
     }
 }