diff --git a/ToDo.md b/ToDo.md
index a8e5844..6a1df76 100644
--- a/ToDo.md
+++ b/ToDo.md
@@ -1,7 +1,6 @@
 # ToDo
 
 * ~~assign to returned values~~
-* special cases (like if ... exitWith, waitUntil {...})
 * ~~sqf: ... sqf whitespace~~
 * ~~solution for build in commands which do not require left values~~
 * ~~pretty/minified printing~~
@@ -11,3 +10,10 @@
 * ~~inline buildin function call -> foo(a)(bar(x)(y));~~
 * ~~negative values e.g. -1, operator !~~
 * ~~tokenizer splits commands like "format" -> for, mat~~
+* try ... catch
+
+## Special cases
+
+* exitWith...
+* waitUntil...
+* !buildInFunc()()...
diff --git a/in/complex.asl b/in/complex.asl
index 2fe4670..9203afc 100644
--- a/in/complex.asl
+++ b/in/complex.asl
@@ -1,2 +1,39 @@
-//diag_log format ["easyHC: found headless client with ID %1.", easyHCpresent];
-diag_log () (format(xy)("asdf", "hjkl"));
+/*
+if (!isServer && player != player) then { // wait until player is on the server
+    waitUntil {player == player};
+};
+
+_getunit = _this select 0;
+_file = _this select 1;
+
+if (!isNil _getunit) then { // unit exists?
+    _unit = objNull;
+    call compile format ["_unit = %1", _getunit];
+    
+    if (local _unit) then { // test if local (player character)
+        try {
+            [_unit] execVM _file;
+        }
+        catch {
+            // do nothing
+        }
+    }
+};
+*/
+
+if !isServer && player != player {
+    exit()(); // does not work for SQF, need to implement exitWith...
+}
+
+var _getunit = select(_this)(0);
+var _file = select(_this)(1);
+
+if !(isNil()(_getunit)) {
+    var _unit = objNull;
+    call()(compile()(format()("_unit = %1", _getunit)));
+    
+    if local()(_unit) {
+        // try...catch
+        execVM(_unit)(_file);
+    }
+}
diff --git a/src/asl/parser.go b/src/asl/parser.go
index 21a1b0b..4d5bb0a 100644
--- a/src/asl/parser.go
+++ b/src/asl/parser.go
@@ -326,7 +326,7 @@ func parseParameter(out bool) (string, int) {
 func parseExpression(out bool) string {
 	output := parseArith()
 
-	for accept("<") || accept(">") || accept("&") || accept("|") || accept("=") {
+	for accept("<") || accept(">") || accept("&") || accept("|") || accept("=") || accept("!") {
 		if accept("<") {
 			output += "<"
 			next()
@@ -341,9 +341,13 @@ func parseExpression(out bool) string {
 			next()
 			expect("|")
 			output += "||"
-		} else {
+		} else if accept("=") {
 			output += "="
 			next()
+		} else {
+		    next()
+		    expect("=")
+		    output += "!="
 		}
 
 		if accept("=") {
diff --git a/src/asl/parser_test.go b/src/asl/parser_test.go
index af1e3e4..218cc35 100644
--- a/src/asl/parser_test.go
+++ b/src/asl/parser_test.go
@@ -94,6 +94,13 @@ func TestParserBuildinFunctionCall(t *testing.T) {
 	equal(t, got, want)
 }
 
+func TestParserOperator(t *testing.T) {
+	got := getCompiled(t, "test/parser_operator.asl")
+	want := "if (x==y&&x!=y&&x<=y&&x>=y&&x<y&&x>y) then {\n};\n"
+
+	equal(t, got, want)
+}
+
 func getCompiled(t *testing.T, file string) string {
 	code, err := ioutil.ReadFile(file)
 
diff --git a/test/parser_operator.asl b/test/parser_operator.asl
new file mode 100644
index 0000000..7d1482e
--- /dev/null
+++ b/test/parser_operator.asl
@@ -0,0 +1,3 @@
+if x == y && x != y && x <= y && x >= y && x < y && x > y {
+    // ...
+}