test closes #8740

tests/unit/src/unit/issues/Issue8740.hx

@@ -0,0 +1,19 @@
+package unit.issues;
+
+class Issue8740 extends unit.Test {
+	function test() {
+		eq(42.0, ("":DateTime));
+	}
+}
+
+private abstract DateTime(Float) from Float to Float {
+	@:from
+	static public inline function fromString(str:String):DateTime {
+		var day:Null<Int> = 22;
+		return make(day);
+	}
+
+	static public inline function make(day:Int = 1):DateTime {
+		return (day - 1) * 2;
+	}
+}