Merge pull request #6652 from ethereum/smt_tuple_function

[SMTChecker] Support tuples as function calls with multiple return values

test/libsolidity/smtCheckerTests/types/tuple_assignment.sol

@@ -10,3 +10,4 @@ contract C
 		assert(y == 4);
 	}
 }
+// ----

test/libsolidity/smtCheckerTests/types/tuple_function.sol

@@ -0,0 +1,17 @@
+pragma experimental SMTChecker;
+
+contract C
+{
+	function f() internal pure returns (uint, uint) {
+		return (2, 3);
+	}
+	function g() public pure {
+		uint x;
+		uint y;
+		(x,y) = f();
+		assert(x == 1);
+		assert(y == 4);
+	}
+}
+// ----
+// Warning: (182-196): Assertion violation happens here

test/libsolidity/smtCheckerTests/types/tuple_function_2.sol

@@ -0,0 +1,17 @@
+pragma experimental SMTChecker;
+
+contract C
+{
+	function f() internal pure returns (uint, uint) {
+		return (2, 3);
+	}
+	function g() public pure {
+		uint x;
+		uint y;
+		(x,) = f();
+		assert(x == 2);
+		assert(y == 4);
+	}
+}
+// ----
+// Warning: (199-213): Assertion violation happens here

test/libsolidity/smtCheckerTests/types/tuple_function_3.sol

@@ -0,0 +1,19 @@
+pragma experimental SMTChecker;
+
+contract C
+{
+	function f() internal pure returns (uint, bool, uint) {
+		return (2, false, 3);
+	}
+	function g() public pure {
+		uint x;
+		uint y;
+		bool b;
+		(,b,) = f();
+		assert(x == 2);
+		assert(y == 4);
+		assert(!b);
+	}
+}
+// ----
+// Warning: (205-219): Assertion violation happens here

test/libsolidity/smtCheckerTestsJSON/multi.json

@@ -3,9 +3,9 @@
 	{
 		"smtlib2responses":
 		{
-			"0x47a038dd9021ecb218726ea6bf1f75c215a50b1981bae4341e89c9f2b7ac5db7": "sat\n((|EVALEXPR_0| 1))\n",
-			"0xf057b272f2ceb99a2f714cb132960babdeedfb84ff8ffb96106a58bc0c2060cb": "sat\n((|EVALEXPR_0| 0))\n",
-			"0xf49b9d0eb7b6d2f2ac9e1604288e52ee1a08cda57058e26d7843ed109ca6d7c9": "unsat\n"
+			"0x092d52dc5c2b54c1909592f7b3c8efedfd87afc0223ce421a24a1cc7905006b4": "sat\n((|EVALEXPR_0| 1))\n",
+			"0x8faacfc008b6f2278b5927ff22d76832956dfb46b3c21a64fab96583c241b88f": "unsat\n",
+			"0xa66d08de30c873ca7d0e7e9e426f278640e0ee463a1aed2e4e80baee916b6869": "sat\n((|EVALEXPR_0| 0))\n"
 		}
 	}
 }

test/libsolidity/smtCheckerTestsJSON/simple.json

@@ -3,7 +3,7 @@
 	{
 		"smtlib2responses":
 		{
-			"0xf057b272f2ceb99a2f714cb132960babdeedfb84ff8ffb96106a58bc0c2060cb": "sat\n((|EVALEXPR_0| 0))\n"
+			"0xa66d08de30c873ca7d0e7e9e426f278640e0ee463a1aed2e4e80baee916b6869": "sat\n((|EVALEXPR_0| 0))\n"
 		}
 	}
 }