diff.c: split emit_line() from the first char and the rest of the line

diff --git a/t/t7002-grep.sh b/t/t7002-grep.sh
index 5e359cb561b6d6f7c1bae678b7b823ed2ce34cf1..087bacb89747bb3da7fc3f7ab3fe08bacea91d52 100755 (executable)
--- a/t/t7002-grep.sh
+++ b/t/t7002-grep.sh
@@ -26,6 +26,10 @@ test_expect_success setup '
        git commit -m initial
 '
 
+test_expect_success 'grep should not segfault with a bad input' '
+       test_must_fail git grep "("
+'
+
 for H in HEAD ''
 do
        case "$H" in