addressing review comments

test/libsolidity/smtCheckerTests/try_catch/try_4.sol

@@ -23,6 +23,8 @@ contract C {
 		}
 	}
 }
+// ====
+// SMTIgnoreCex: yes
 // ----
-// Warning 6328: (211-225): CHC: Assertion violation happens here.\nCounterexample:\nx = (- 1), d = 0\n\n\n\nTransaction trace:\nC.constructor()\nState: x = 0, d = 0\nC.f()
-// Warning 6328: (351-365): CHC: Assertion violation happens here.\nCounterexample:\nx = 0, d = 0\n\n\n\nTransaction trace:\nC.constructor()\nState: x = 0, d = 0\nC.f()
+// Warning 6328: (211-225): CHC: Assertion violation happens here.
+// Warning 6328: (351-365): CHC: Assertion violation happens here.

test/libsolidity/smtCheckerTests/try_catch/try_string_literal_to_bytes_array.sol

@@ -0,0 +1,17 @@
+pragma experimental SMTChecker;
+contract C {
+
+	function g() public pure returns (bytes memory) {
+		return hex"ffff";
+	}
+
+	function f() public view {
+		try this.g() returns (bytes memory b) {
+			assert(b[0] == bytes1(uint8(255)) && b[1] == bytes1(uint8(255))); // should hold
+			assert(b[0] == bytes1(uint8(0)) || b[1] == bytes1(uint8(0))); // should fail
+		} catch {
+		}
+	}
+}
+// ----
+// Warning 6328: (278-338): CHC: Assertion violation happens here.\nCounterexample:\n\n\n\n\nTransaction trace:\nC.constructor()\nC.f()

test/libsolidity/smtCheckerTests/try_catch/try_string_literal_to_fixed_bytes.sol

@@ -0,0 +1,17 @@
+pragma experimental SMTChecker;
+contract C {
+
+	function g() public pure returns (bytes2) {
+		return hex"ffff";
+	}
+
+	function f() public view {
+		try this.g() returns (bytes2 b) {
+			assert(uint8(b[0]) == 255 && uint8(b[1]) == 255); // should hold
+			assert(uint8(b[0]) == 0 || uint8(b[1]) == 0); // should fail
+		} catch {
+		}
+	}
+}
+// ----
+// Warning 6328: (250-294): CHC: Assertion violation happens here.