hello!

Ruby allows code like this:

  def file_replace filename, file,
    files = document.files

In this case, it was a typo, and could have produced problems. I'm not
sure how many people are using multi-line method declarations
intentionally, but I think they are few.

So I suggest that the Ruby parser issues a warning, like:

  warning: trailing comma in method declaration

It should be possible to silence the warning:

  def file_replace filename, file, \
    files = document.files

with the backslash making clear what you want here.

What do you think?
[murphy]