[SMTChecker] Fix ICEs with tuples

test/libsolidity/smtCheckerTests/types/function_in_tuple_1.sol

@@ -0,0 +1,10 @@
+pragma experimental SMTChecker;
+
+contract K {
+	function f() public pure {
+		(abi.encode, 2);
+	}
+}
+// ----
+// Warning: (76-91): Statement has no effect.
+// Warning: (77-80): Assertion checker does not yet implement type abi

test/libsolidity/smtCheckerTests/types/function_in_tuple_2.sol

@@ -0,0 +1,10 @@
+pragma experimental SMTChecker;
+
+contract K {
+	function f() public pure {
+		(abi.encode, "");
+	}
+}
+// ----
+// Warning: (76-92): Statement has no effect.
+// Warning: (77-80): Assertion checker does not yet implement type abi

test/libsolidity/smtCheckerTests/types/tuple_single_element_1.sol

@@ -0,0 +1,9 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f() public pure {
+		(("", 2));
+	}
+}
+// ----
+// Warning: (76-85): Statement has no effect.

test/libsolidity/smtCheckerTests/types/tuple_single_element_2.sol

@@ -0,0 +1,9 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f() public pure {
+		(("", ""));
+	}
+}
+// ----
+// Warning: (76-86): Statement has no effect.

test/libsolidity/smtCheckerTests/types/tuple_single_non_tuple_element.sol

@@ -0,0 +1,9 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f() public pure {
+		(2);
+	}
+}
+// ----
+// Warning: (76-79): Statement has no effect.