git stash save/push

git stash saveはdeprecatedになっていた メッセージをつけてpushしろってこと

This option is deprecated in favour of git stash push. It differs from "stash push" in that it cannot take pathspec. Instead, all non-option arguments are concatenated to form the stash message.

git-scm.com

2.16.0からdeprecatedになっていた はるか昔だ https://raw.githubusercontent.com/git/git/c54a18ef67e59cdbcd77d6294916d42c98c62d1d/Documentation/RelNotes/2.16.0.adoc