`lei rediff' reads from stdin when no argument is specified, but this
is likely unintentional given that other lei commands instead have a
--stdin|- option and that `lei rediff --help' includes --stdin.
Align rediff's handling with the other commands'.
qw(git-dir=s@ cwd! verbose|v+ mail! oid-a|A=s path-a|a=s path-b|b=s),
@lxs_opt, @c_opt ],
-'rediff' => [ '[--stdin|LOCATION...]',
+'rediff' => [ '--stdin|LOCATION...',
'regenerate a diff with different options',
+ 'stdin|', # /|\z/ must be first for lone dash
qw(git-dir=s@ cwd! verbose|v+ color:s no-color),
@diff_opt, @lxs_opt, @c_opt ],