Re: grep-tree bug

[Richard Stallman]

    Aha, it does work properly if you supply a directory with an ending
    slash to grep-tree:

      M-x grep-tree RET set-file-modes RET el RET ~/emacs/lisp/ RET

    But wouldn't it be friendlier if grep-tree could take care of this in
    some way?

Yes, it should do something to make sure the name is a directory
name, not a file name.  It could perhaps call file-name-as-directory
on the argument.