token: note in the godoc what tokens are bash-only
token: note in the godoc what tokens are bash-only

That means which tokens will never be used when PosixConformant is true.
Other tokens might still be used with new meanings in a Bash program,
such as , which can be used inside ${} only in bash as well as in $(())
in posix.

mvdan/sh,mvdan/sh,mvdan/sh,mvdan/sh