Bound functions.

test/libsolidity/semanticTests/libraries/bound_returning_calldata_external.sol

@@ -14,6 +14,7 @@ contract C {
     }
 }
 // ====
+// compileViaYul: also
 // EVMVersion: >homestead
 // ----
 // library: D

test/libsolidity/semanticTests/libraries/bound_to_calldata_external.sol

@@ -14,6 +14,7 @@ contract C {
     }
 }
 // ====
+// compileViaYul: also
 // EVMVersion: >homestead
 // ----
 // library: D

test/libsolidity/semanticTests/libraries/internal_call_bound_with_parentheses.sol

@@ -0,0 +1,27 @@
+library L {
+    struct S {
+        uint256[] data;
+    }
+
+    function f(S memory _s) internal {
+        _s.data[3] += 2;
+    }
+}
+
+
+contract C {
+    using L for L.S;
+
+    function f() public returns (uint256) {
+        L.S memory x;
+        x.data = new uint256[](7);
+        x.data[3] = 8;
+        (x.f)();
+        return x.data[3];
+    }
+}
+
+// ====
+// compileViaYul: also
+// ----
+// f() -> 0x0a

test/libsolidity/semanticTests/libraries/internal_library_function_bound_to_storage_string.sol

@@ -0,0 +1,22 @@
+library L {
+    function f(string memory a) internal pure returns (string memory) {
+        return a;
+    }
+    function g(string storage a) internal pure returns (string memory) {
+        return a;
+    }
+}
+
+contract C {
+    using L for string;
+    string s;
+
+    function test(string calldata x) public returns (string memory, string memory) {
+        s = x;
+        return (s.f(), s.g());
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// test(string): 0x20, 3, "def" -> 0x40, 0x80, 3, "def", 3, "def"