Move several tests related to function types from nameAndTypeResolution/ to more specific directories

test/libsolidity/syntaxTests/abiEncoder/external_functions_taking_internal_types_nested_struct_with_mapping.sol

@@ -0,0 +1,10 @@
+pragma abicoder               v2;
+
+contract C {
+    struct T { mapping(uint => uint) a; }
+    struct S { T[][2] b; }
+    function f(S memory) public {}
+}
+// ----
+// TypeError 4103: (132-140): Types containing (nested) mappings can only be parameters or return variables of internal or library functions.
+// TypeError 4061: (132-140): Type struct C.S is only valid in storage because it contains a (nested) mapping.

test/libsolidity/syntaxTests/abiEncoder/external_functions_taking_internal_types_struct_with_function_type.sol

@@ -0,0 +1,8 @@
+pragma abicoder               v2;
+
+contract C {
+    struct S { function() internal a; }
+    function f(S memory) public {}
+}
+// ----
+// TypeError 4103: (103-111): Internal type is not allowed for public or external functions.

test/libsolidity/syntaxTests/abiEncoder/external_functions_taking_internal_types_struct_with_mapping.sol

@@ -0,0 +1,9 @@
+pragma abicoder               v2;
+
+contract C {
+    struct S { mapping(uint => uint) a; }
+    function f(S memory) public {}
+}
+// ----
+// TypeError 4103: (105-113): Types containing (nested) mappings can only be parameters or return variables of internal or library functions.
+// TypeError 4061: (105-113): Type struct C.S is only valid in storage because it contains a (nested) mapping.

test/libsolidity/syntaxTests/abiEncoder/overloaded_external_functions_taking_different_structs.sol

@@ -0,0 +1,9 @@
+pragma abicoder               v2;
+
+contract C {
+    struct S1 { function() external a; }
+    struct S2 { bytes24 a; }
+    function f(S1 memory) public pure {}
+    function f(S2 memory) public pure {}
+}
+// ----

test/libsolidity/syntaxTests/abiEncoder/overloaded_external_functions_taking_identical_structs.sol

@@ -0,0 +1,10 @@
+pragma abicoder               v2;
+
+contract C {
+    struct S1 { int i; }
+    struct S2 { int i; }
+    function f(S1 memory) public pure {}
+    function f(S2 memory) public pure {}
+}
+// ----
+// TypeError 9914: (143-179): Function overload clash during conversion to external types for arguments.