I ran into the following bug today: "BUG: PATHSPEC_PREFER_CWD requires
arguments". It's not that bad because I'm trying to run `git log
--merge` on an already resolved conflict. Still, I don't think I
should hit a "BUG:" :-)

Here is a script to reproduce:
git init .
git add a
git commit -m"create a"
git branch other
echo "1" >a
git commit -m"add 1" a
git checkout other
echo "2" >a
git commit -m"add 2" a
git merge master
git add a
git log --merge -- a
# Fails with "fatal: BUG: PATHSPEC_PREFER_CWD requires arguments"

Here is what GDB gives me when I break on die():
Breakpoint 1, die (err=0x57e3a8 "BUG: PATHSPEC_PREFER_CWD requires
arguments") at usage.c:97
97              if (die_is_recursing()) {
(gdb) bt
#0  die (err=0x57e3a8 "BUG: PATHSPEC_PREFER_CWD requires arguments")
at usage.c:97
#1  0x00000000004ea58a in parse_pathspec (pathspec=0x7fffffffc288,
magic_mask=31, flags=0, prefix=0x580dad "", argv=0x0) at
#2  0x00000000005097b4 in prepare_show_merge (revs=0x7fffffffc240) at
#3  0x000000000050c32e in setup_revisions (argc=2,
argv=0x7fffffffcb08, revs=0x7fffffffc240, opt=0x7fffffffc220) at
#4  0x0000000000446efc in cmd_log_init_finish (argc=4,
argv=0x7fffffffcb08, prefix=0x0, rev=0x7fffffffc240,
    at builtin/log.c:147
#5  0x000000000044716a in cmd_log_init (argc=4, argv=0x7fffffffcb08,
prefix=0x0, rev=0x7fffffffc240, opt=0x7fffffffc220) at
#6  0x0000000000448349 in cmd_log (argc=4, argv=0x7fffffffcb08,
prefix=0x0) at builtin/log.c:635
#7  0x000000000040584a in run_builtin (p=0x7bdb30, argc=4,
argv=0x7fffffffcb08) at git.c:314
#8  0x00000000004059d5 in handle_internal_command (argc=4,
argv=0x7fffffffcb08) at git.c:478
#9  0x0000000000405b88 in main (argc=4, av=0x7fffffffcb08) at git.c:575

And here is what bisect found:
commit 9a0872744315da67db3c81eb9270751e31fcc8f5
Author: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
Date:   Sun Jul 14 15:35:59 2013 +0700

    remove init_pathspec() in favor of parse_pathspec()

    While at there, move free_pathspec() to pathspec.c

    Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
    Signed-off-by: Junio C Hamano <gits...@pobox.com>

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