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-rw-r--r--date.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/date.c b/date.c
index 9c5870e102..8126146c50 100644
--- a/date.c
+++ b/date.c
@@ -921,6 +921,10 @@ static enum date_mode_type parse_date_type(const char *format, const char **end)
return DATE_UNIX;
if (skip_prefix(format, "format", end))
return DATE_STRFTIME;
+ /*
+ * Please update $__git_log_date_formats in
+ * git-completion.bash when you add new formats.
+ */
die("unknown date format %s", format);
}