Added default data locations to parameters for syntax tests.

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

@@ -9,7 +9,7 @@ contract C {
 
   struct W { uint x; }
 
-  function f(T) public pure { }
+  function f(T memory) public pure { }
 }
 // ----
 // Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.

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

@@ -9,7 +9,7 @@ contract TestContract
         SubStruct subStruct1;
         SubStruct subStruct2;
     }
-    function addTestStruct(TestStruct) public pure {}
+    function addTestStruct(TestStruct memory) public pure {}
 }
 // ----
 // Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.

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

@@ -1,6 +1,6 @@
 contract C {
     struct S { uint a; S[] sub; }
-    function f() public pure returns (uint, S) {
+    function f() public pure returns (uint, S memory) {
     }
 }
 // ----

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

@@ -1,6 +1,6 @@
 contract C {
     struct S { uint a; S[2][] sub; }
-    function f() public pure returns (uint, S) {
+    function f() public pure returns (uint, S memory) {
     }
 }
 // ----

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

@@ -1,8 +1,8 @@
 contract C {
     struct S { uint a; S[][][] sub; }
     struct T { S s; }
-    function f() public pure returns (uint x, T t) {
+    function f() public pure returns (uint x, T memory t) {
     }
 }
 // ----
-// TypeError: (119-122): Internal or recursive type is not allowed for public or external functions.
+// TypeError: (119-129): Internal or recursive type is not allowed for public or external functions.