tpope/vim-sleuth — pull request #10 by ashumkin (2014-02-17 16:09:42+00:00)
Title: fixed: error "Error detected while processing function <SNR><N>_detect"

Some files can be unreadable by a current user when traversing up
through "neighbor"-files. If so, the following error occurs:
Error detected while processing function _detect:
line 12:
E484: Can't open file

To avoid this error, let's be sure we can read that file before we try
to read it.