Laravel where is the request bound into the container?

I know Laravel binds the request into the container since the helper method resolves it from the container like so:

function request($key = null, $default = null)
{
    if (is_null($key)) {
        return app('request');
    }

    if (is_array($key)) {
        return app('request')->only($key);
    }

    return app('request')->input($key, $default);
}

At what exact point is the request being bound into the container though? I can't seem to find it.

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