(long_opts): Change the name of each undocumented, for-

testing-only option to start with `-', so that it cannot render
ambiguous any prefix it happens to share with some other option name.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/rm.c b/src/rm.c
index 4b1999970..2fdaa92af 100644
--- a/src/rm.c
+++ b/src/rm.c
@@ -88,7 +88,7 @@ static struct option const long_opts[] =
   /* It is relatively difficult to ensure that there is a tty on stdin.
      Since rm acts differently depending on that, without this option,
      it'd be harder to test the parts of rm that depend on that setting.  */
-  {"presume-input-tty", no_argument, NULL, PRESUME_INPUT_TTY_OPTION},
+  {"-presume-input-tty", no_argument, NULL, PRESUME_INPUT_TTY_OPTION},
 
   {"recursive", no_argument, NULL, 'r'},
   {"verbose", no_argument, NULL, 'v'},