struct Context {}

struct App {
mut:
    called bool
}

fn (mut app App) before_request(mut ctx Context) {
    app.called = true
}

interface HasBeforeRequest[X] {
mut:
    before_request(mut ctx X)
}

fn check_before_request[A, X](mut app A) bool {
    mut ctx := Context{}
    $if A is HasBeforeRequest[X] {
        app.before_request(mut ctx)
        return true
    } $else {
        return false
    }
}

fn test_comptime_if_is_generic_interface_with_generic_type_param() {
    mut app := App{}
    assert check_before_request[App, Context](mut app)
    assert app.called
}