* lisp/progmodes/sh-script.el (sh-smie--sh-keyword-p): Treat "do" as
special, like we treat "in".
(sh-smie--sh-keyword-in-p): Change signature. Take the token to
decide correctly if it's a keyword.
(sh-font-lock-keywords-var-1): Add do.
* test/lisp/progmodes/sh-script-resources/sh-indents.erts: New test.
* test/lisp/progmodes/sh-script-tests.el
(sh-script-test-do-fontification): New test.