Method reference on a method with @Template generates invalid code

[npiguet]

Right now, code like

Map<String, String> map = $map();
$array("a", "b", "c").$forEach(map::$delete);

would generate the following (obviously wrong) code:

var map = {};
["a", "b", "c"].forEach(stjs.bind(map, "$delete"));

The root cause of this is $delete is not really a method of Map (well, Map itself is not really a class to begin with...), but we use a clever @Template to make it look like it is. The method reference translation code is not @Template aware, and in this case there really isn't way to generate the corresponding code.

ST-JS should generate a compile-time error when a method reference is used on a method that carries an @Template annotation. It should also suggest the user to transform the method reference to a Lambda, which would solve the problem:

Map<String, String> map = $map();
$array("a", "b", "c").$forEach(i -> map.$delete(i));

would generate the following (now correct) code:

var map = {};
["a", "b", "c"].forEach(function(i){delete map[i];});