Incorrect indentation of lambdas in array::map and array.forEach

[jcubic]

This works fine for Ruby mode on the Codemirror website:

arr.each(((lambda {|x|
    puts x
})))

But in Gaimain playground you get this:

let mapping = [
["factorial", "white"],
["interpreter", "red"]
].map(lambda(pair)
        let token = pair[0]
        let color = pair[1]
        pair[0] = new RegExp("(" + token + ")", "gi")
        pair[1] = "[[;$color;]$1]"
        return pair
    end).forEach(lambda (formatter)
        jQuery.terminal.new_formatter(formatter)
    end)

Another issue is an indentation of nested arrays. This also works fine for Ruby mode.