add test (closes #4089)

tests/unit/src/unit/issues/Issue4089.hx

@@ -0,0 +1,16 @@
+package unit.issues;
+import unit.Test;
+
+class Issue4089 extends Test {
+	static var timestamp = 1.0;
+
+	function test() {
+		function printTime(time:Float) {
+			return time;
+		}
+		var p1 = printTime.bind(timestamp);
+		feq(1.0, p1());
+		timestamp = 2.0;
+		feq(1.0, p1());
+	}
+}