Fix trailing token crash

[lukaszsamson]

I noticed this crash in the logs. I'm not sure what input produced that error.

an exception was raised:
    ** (FunctionClauseError) no function clause matching in Code.Fragment.drop_tokens_2
        (elixir 1.18.3) <REDACTED: user-file-path>:1209: Code.Fragment.drop_tokens([], 2)
        (elixir 1.18.3) <REDACTED: user-file-path>:1184: Code.Fragment.container_cursor_to_quoted_2

[josevalim]

@lukaszsamson plesse rebase or swap branches? :)

[josevalim]

Can we add a failing test please? Thank you!

[josevalim]

I tried reverse engineering a failed input, since you said you don't have one, and I could not for now. :( So we will merge it as is. Thanks!

[josevalim]

💚 💙 💜 💛 ❤️