Merge pull request #4466 from ethereum/tupleNotEmpty

Disallow empty tuple components.

test/libsolidity/SolidityEndToEndTest.cpp

@@ -7916,7 +7916,7 @@ BOOST_AUTO_TEST_CASE(string_tuples)
 				return (h(), "def");
 			}
 			function h() public returns (string) {
-				return ("abc",);
+				return ("abc");
 			}
 		}
 	)";

test/libsolidity/syntaxTests/nameAndTypeResolution/244_tuples.sol

@@ -1,13 +1,13 @@
 contract C {
     function f() public {
         uint a = (1);
-        (uint b,) = (uint8(1),);
+        (uint b,) = uint8(1);
         (uint c, uint d) = (uint32(1), 2 + a);
         (uint e,) = (uint64(1), 2, b);
         a;b;c;d;e;
     }
 }
 // ----
-// Warning: (69-92): Different number of components on the left hand side (2) than on the right hand side (1).
-// Warning: (149-178): Different number of components on the left hand side (2) than on the right hand side (3).
-// Warning: (17-204): Function state mutability can be restricted to pure
+// Warning: (69-89): Different number of components on the left hand side (2) than on the right hand side (1).
+// Warning: (146-175): Different number of components on the left hand side (2) than on the right hand side (3).
+// Warning: (17-201): Function state mutability can be restricted to pure

test/libsolidity/syntaxTests/parsing/tuples.sol

@@ -1,16 +1,16 @@
 contract C {
 	function f() public {
 		uint a = (1);
-		(uint b,) = (1,);
+		(uint b,) = 1;
 		(uint c, uint d) = (1, 2 + a);
 		(uint e,) = (1, 2, b);
 		(a) = 3;
 	}
 }
 // ----
-// Warning: (54-70): Different number of components on the left hand side (2) than on the right hand side (1).
-// Warning: (107-128): Different number of components on the left hand side (2) than on the right hand side (3).
-// Warning: (75-81): Unused local variable.
-// Warning: (83-89): Unused local variable.
-// Warning: (108-114): Unused local variable.
-// Warning: (14-143): Function state mutability can be restricted to pure
+// Warning: (54-67): Different number of components on the left hand side (2) than on the right hand side (1).
+// Warning: (104-125): Different number of components on the left hand side (2) than on the right hand side (3).
+// Warning: (72-78): Unused local variable.
+// Warning: (80-86): Unused local variable.
+// Warning: (105-111): Unused local variable.
+// Warning: (14-140): Function state mutability can be restricted to pure

test/libsolidity/syntaxTests/types/empty_tuple_function.sol

@@ -8,5 +8,5 @@ contract C {
     }
 }
 // ----
-// Warning: (162-165): Tuple component cannot be empty.
-// Warning: (181-184): Tuple component cannot be empty.
+// TypeError: (162-165): Tuple component cannot be empty.
+// TypeError: (181-184): Tuple component cannot be empty.

test/libsolidity/syntaxTests/types/empty_tuple_function_050.sol

@@ -1,11 +0,0 @@
-pragma experimental "v0.5.0";
-contract C {
-    function f() private pure {}
-    function a() public pure {
-        bool x = true;
-        bool y = true;
-        (x) ? (f(), y = false) : (f(), y = false);
-    }
-}
-// ----
-// TypeError: (168-171): Tuple component cannot be empty.

test/libsolidity/syntaxTests/types/empty_tuple_lvalue.sol

@@ -8,6 +8,6 @@ contract C {
     }
 }
 // ----
-// Warning: (146-149): Tuple component cannot be empty.
-// Warning: (151-154): Tuple component cannot be empty.
+// TypeError: (146-149): Tuple component cannot be empty.
+// TypeError: (151-154): Tuple component cannot be empty.
 // TypeError: (145-155): Type tuple(tuple(),tuple()) is not implicitly convertible to expected type tuple(uint256,uint256).

test/libsolidity/syntaxTests/types/empty_tuple_lvalue_050.sol

@@ -1,11 +0,0 @@
-pragma experimental "v0.5.0";
-contract C {
-    function f() private pure {}
-    function a() public {
-        uint x;
-        uint y;
-        (x, y) = (f(), f());
-    }
-}
-// ----
-// TypeError: (152-155): Tuple component cannot be empty.

test/libsolidity/syntaxTests/types/no_singleton_tuple.sol

@@ -0,0 +1,8 @@
+contract C {
+	function f() public pure {
+		uint a;
+		(a,) = (uint(1),);
+	}
+}
+// ----
+// TypeError: (60-70): Tuple component cannot be empty.