t3910-mac-os-precompose.sh: use the $( ... ) construct for command substitution

diff --git a/t/t2020-checkout-detach.sh b/t/t2020-checkout-detach.sh
index 81005373d728f09e1a9289048cc721a0300f1cf9..5d68729d7a65abde09d1293e8569b730d2ba9a40 100755 (executable)
--- a/t/t2020-checkout-detach.sh
+++ b/t/t2020-checkout-detach.sh
@@ -151,6 +151,7 @@ test_expect_success 'checkout does not warn leaving reachable commit' '
 
 cat >expect <<'EOF'
 Your branch is behind 'master' by 1 commit, and can be fast-forwarded.
+  (use "git pull" to update your local branch)
 EOF
 test_expect_success 'tracking count is accurate after orphan check' '
        reset &&