contrib / coccinelle / xstrdup_or_null.coccion commit sequencer (rebase -i): show only failed `git commit`'s output (9a757c4)
   1@@
   2expression E;
   3expression V;
   4@@
   5- if (E)
   6-    V = xstrdup(E);
   7+ V = xstrdup_or_null(E);