Disallow internal function types as parameters for public/external library function

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

@@ -0,0 +1,10 @@
+contract Test {
+    struct MyStructName {
+        address addr;
+        MyStructName[] x;
+    }
+
+    function f(MyStructName memory s) public {}
+}
+// ----
+// TypeError: (112-133): Recursive type not allowed for public or external contract functions.

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

@@ -0,0 +1,9 @@
+library Test {
+    struct MyStructName {
+        address addr;
+        MyStructName[] x;
+    }
+
+    function f(MyStructName storage s) public {}
+}
+// ----

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

@@ -0,0 +1,14 @@
+pragma experimental ABIEncoderV2;
+
+library Test {
+    struct MyStructName {
+        address addr;
+        MyStructName[] x;
+    }
+
+    function f(MyStructName memory _x) public {
+    }
+}
+// ----
+// Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.
+// TypeError: (146-168): Recursive structs can only be passed as storage pointers to libraries, not as memory objects to contract functions.

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

@@ -8,4 +8,4 @@ contract Data {
 }
 // ----
 // 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.
+// TypeError: (63-78): Recursive type not allowed for public or external contract functions.

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

@@ -0,0 +1,11 @@
+library Test {
+    struct MyStructName {
+        address addr;
+        MyStructName[] x;
+        function() internal y;
+    }
+
+    function f(MyStructName storage s) public {}
+}
+// ----
+// TypeError: (142-164): Internal type is not allowed for public or external functions.

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

@@ -4,4 +4,4 @@ contract C {
     }
 }
 // ----
-// TypeError: (91-99): Internal or recursive type is not allowed for public or external functions.
+// TypeError: (91-99): Recursive type not allowed for public or external contract functions.

test/libsolidity/syntaxTests/structs/recursion/return_recursive_structs2.sol

@@ -4,4 +4,4 @@ contract C {
     }
 }
 // ----
-// TypeError: (94-102): Internal or recursive type is not allowed for public or external functions.
+// TypeError: (94-102): Recursive type not allowed for public or external contract functions.

test/libsolidity/syntaxTests/structs/recursion/return_recursive_structs3.sol

@@ -5,4 +5,4 @@ contract C {
     }
 }
 // ----
-// TypeError: (119-129): Internal or recursive type is not allowed for public or external functions.
+// TypeError: (119-129): Recursive type not allowed for public or external contract functions.