5f80147c55
The effect of the bug was that «-:» was considered an option taking an argument (see the parsing of the associative array in lines 692-693). As to preventing recurrence, add a warning comment. We _could_ change the separator from colon to something else, but colon is idiomatic for this use (see, e.g., passwd(5)), and the problem will be unlikely to recur if and when we add a third field to the assoc's values. (For example, jexec(1), chroot(1), and even ssh(1) would benefit from a third field saying how many positional arguments to skip before the positional argument that's to be the command word — though in the last two cases, specifying an "inner" command is optional.)
zsh-syntax-highlighting / highlighters
Navigate into the individual highlighters' documentation to see
what styles ($ZSH_HIGHLIGHT_STYLES keys) each highlighter defines.
Refer to the documentation on highlighters for further information.