How does Remember me feature of Laravel works from core

I wanted to know how does Laravel (v5.1) authenticates the user by validating remember_me cookie on session expiration, I learned, how does this cookie is generated, but I'm unable to find how & where does Laravel validate this cookie, received from the request and re-generates the new session on expiration. I'm looking for code, that makes this mechanism work so that I can understand more clearly about How this mechanism actually works.

via Chebli Mohamed