From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefano Lattarini <stefano.lattarini@gmail.com>
Subject: [BUG] "git diff FILE BRANCH:FILE" erroneously report FILE does not
 exist in BRANCH
Date: Sat, 21 Jan 2012 20:36:27 +0100
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Here is a complete reproducer for the bug:

mkdir foo \
  && cd foo \
  && git init . \
  && >README \
  && git add README \
  && git commit -m "for all" \
  && git checkout -b devel \
  && echo dev > README \
  && git add README \
  && git commit -m "for developers" \
  && git diff devel:README master:README \
  && git diff README master:README

I'd expect the last "git diff" to report the same diffs as the previous one;
instead, it errors out with this bogus message:

  fatal: Path 'README' exists on disk, but not in 'master'.

Behaviour verified with git version 1.7.7.3 (installed from official Debian
packages) and the latest git development version (1.7.9.rc0.69.gbddcef, from
master).

Regards, and thanks for your amazing software,
  Stefano