[cs] Added test for #2874

tests/unit/issues/Issue2874.hx

@@ -0,0 +1,44 @@
+package unit.issues;
+
+class Issue2874 extends unit.Test
+{
+	private function test()
+	{
+		var a = new Arr(["1","2"]);
+		var a2 = a.map(function(v) return Std.parseInt(v));
+		eq(1,a2[0]);
+		eq(2,a2[1]);
+		// var a3:Arr<Int> = a.map(function(v) return Std.parseInt(v));
+		// eq(1,a3[0]);
+		// eq(2,a3[1]);
+	}
+
+	private function testArray()
+	{
+		var a = ["1","2"];
+		var a2 = a.map(function(v) return Std.parseInt(v));
+		eq(1,a2[0]);
+		eq(2,a2[1]);
+		// var a3:Array<Int> = a.map(function(v) return Std.parseInt(v));
+		// eq(1,a3[0]);
+		// eq(2,a3[1]);
+	}
+}
+
+@:arrayAccess abstract Arr<T>(Array<T>)
+{
+	@:extern inline public function new(a)
+	{
+		this = a;
+	}
+
+	@:extern inline public function map<X>(fn:T->X):Arr<X>
+	{
+		var arr2 = [];
+		for (v in this)
+		{
+			arr2.push(fn(v));
+		}
+		return new Arr(arr2);
+	}
+}