Update and extend tests for return expressions.

test/libsolidity/syntaxTests/controlFlow/storageReturn/emptyReturn_err.sol

@@ -1,14 +0,0 @@
-contract C {
-    struct S { bool f; }
-    S s;
-    function f() internal pure returns (S storage) { return; }
-    function g() internal view returns (S storage c, S storage) { c = s; return; }
-    function h() internal view returns (S storage, S storage d) { d = s; return; }
-    function i() internal pure returns (S storage, S storage) { return; }
-}
-// ----
-// TypeError: (87-88): This variable is of storage pointer type and might be returned without assignment and could be used uninitialized. Assign the variable (potentially from itself) to fix this error.
-// TypeError: (163-164): This variable is of storage pointer type and might be returned without assignment and could be used uninitialized. Assign the variable (potentially from itself) to fix this error.
-// TypeError: (233-234): This variable is of storage pointer type and might be returned without assignment and could be used uninitialized. Assign the variable (potentially from itself) to fix this error.
-// TypeError: (316-317): This variable is of storage pointer type and might be returned without assignment and could be used uninitialized. Assign the variable (potentially from itself) to fix this error.
-// TypeError: (327-328): This variable is of storage pointer type and might be returned without assignment and could be used uninitialized. Assign the variable (potentially from itself) to fix this error.

test/libsolidity/syntaxTests/controlFlow/storageReturn/emptyReturn_fine.sol

@@ -1,7 +0,0 @@
-contract C {
-    struct S { bool f; }
-    S s;
-    function f() internal view returns (S storage c, S storage d) { c = s; d = s; return; }
-    function g() internal view returns (S storage, S storage) { return (s,s); }
-}
-// ----

test/libsolidity/syntaxTests/nameAndTypeResolution/440_warn_unused_return_parameter_with_explicit_return.sol

@@ -1,7 +0,0 @@
-contract C {
-    function f() pure public returns (uint a) {
-        return;
-    }
-}
-// ----
-// Warning: (51-57): Unused function parameter. Remove or comment out the variable name to silence this warning.

test/libsolidity/syntaxTests/returnExpressions/single_return_mismatching_number.sol

@@ -0,0 +1,14 @@
+contract C
+{
+    function f() public pure returns (uint)
+    {
+        return;
+    }
+    function g() public pure returns (uint)
+    {
+        return (1, 2);
+    }
+}
+// ----
+// TypeError: (71-78): Return arguments required.
+// TypeError: (143-156): Different number of arguments in return statement than in returns declaration.

test/libsolidity/syntaxTests/returnExpressions/single_return_mismatching_number_named.sol

@@ -0,0 +1,14 @@
+contract C
+{
+    function f() public pure returns (uint a)
+    {
+        return;
+    }
+    function g() public pure returns (uint a)
+    {
+        return (1, 2);
+    }
+}
+// ----
+// TypeError: (73-80): Return arguments required.
+// TypeError: (147-160): Different number of arguments in return statement than in returns declaration.

test/libsolidity/syntaxTests/returnExpressions/tuple_return_mismatching_number.sol

@@ -0,0 +1,19 @@
+contract C
+{
+    function f() public pure returns (uint, uint)
+    {
+        return 1;
+    }
+    function g() public pure returns (uint, uint)
+    {
+        return (1, 2, 3);
+    }
+    function h() public pure returns (uint, uint)
+    {
+        return;
+    }
+}
+// ----
+// TypeError: (77-85): Different number of arguments in return statement than in returns declaration.
+// TypeError: (157-173): Different number of arguments in return statement than in returns declaration.
+// TypeError: (245-252): Return arguments required.

test/libsolidity/syntaxTests/returnExpressions/tuple_return_mismatching_number_named.sol

@@ -0,0 +1,19 @@
+contract C
+{
+    function f() public pure returns (uint a, uint b)
+    {
+        return 1;
+    }
+    function g() public pure returns (uint a, uint b)
+    {
+        return (1, 2, 3);
+    }
+    function h() public pure returns (uint a, uint b)
+    {
+        return;
+    }
+}
+// ----
+// TypeError: (81-89): Different number of arguments in return statement than in returns declaration.
+// TypeError: (165-181): Different number of arguments in return statement than in returns declaration.
+// TypeError: (257-264): Return arguments required.

test/libsolidity/syntaxTests/returnExpressions/valid_returns.sol

@@ -0,0 +1,18 @@
+contract C
+{
+    function f() public pure {
+        return;
+    }
+    function g() public pure returns (uint) {
+        return 1;
+    }
+    function h() public pure returns (uint a) {
+        return 1;
+    }
+    function i() public pure returns (uint, uint) {
+        return (1, 2);
+    }
+    function j() public pure returns (uint a, uint b) {
+        return (1, 2);
+    }
+}