Replace casting of external functions to address by a member named "address".

test/libsolidity/syntaxTests/functionTypes/external_function_type_to_address.sol

@@ -1,5 +1,5 @@
 contract C {
     function f() public view returns (address) {
-        return address(this.f);
+        return this.f.address;
     }
 }

test/libsolidity/syntaxTests/functionTypes/external_function_type_to_address_payable.sol

@@ -1,7 +1,7 @@
 contract C {
     function f() public view returns (address payable) {
-        return address(this.f);
+        return this.f.address;
     }
 }
 // ----
-// TypeError: (85-100): Return argument type address is not implicitly convertible to expected type (type of first return variable) address payable.
+// TypeError: (85-99): Return argument type address is not implicitly convertible to expected type (type of first return variable) address payable.

test/libsolidity/syntaxTests/structs/address_member_access.sol

@@ -0,0 +1,9 @@
+contract C {
+    struct S { uint a; }
+    function f() public pure returns(address) {
+        S memory s = S(42);
+        return s.address;
+    }
+}
+// ----
+// TypeError: (129-138): Member "address" not found or not visible after argument-dependent lookup in struct C.S memory.

test/libsolidity/syntaxTests/structs/address_member_declaration.sol

@@ -0,0 +1,5 @@
+contract C {
+    struct S { uint address; }
+}
+// ----
+// ParserError: (33-40): Expected identifier but got 'address'