test for 4649 (closes #4649)

tests/unit/src/unit/issues/Issue4649.hx

@@ -0,0 +1,15 @@
+package unit.issues;
+
+class Issue4649 extends unit.Test {
+	static var v:Val<Float> = 10.5;
+
+	function test() {
+		v.incr();
+		eq(11.5, v);
+	}
+}
+
+abstract Val<T:Float>(T) from T to T {
+	public inline function incr():Void
+		this++;
+}