Test.

test/libsolidity/syntaxTests/constructor/abstract_creation_forward_reference.sol

@@ -0,0 +1,15 @@
+// This used to cause an internal error because of the visitation order.
+contract Test {
+    function createChild() public {
+       Child asset = new Child();
+    }
+}
+
+contract Parent {
+    constructor(address _address) public {}
+}
+
+contract Child is Parent {
+}
+// ----
+// TypeError: (146-155): Trying to create an instance of an abstract contract.

test/libsolidity/syntaxTests/structs/recursion/recursive_struct_forward_reference.sol

@@ -0,0 +1,11 @@
+pragma experimental ABIEncoderV2;
+
+contract C {
+    function f(Data.S memory a) public {}
+}
+contract Data {
+    struct S { S x; }
+}
+// ----
+// Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.
+// TypeError: (63-78): Internal or recursive type is not allowed for public or external functions.