21cdd6bc5e
$last_alias isn't needed; there's no reason to treat loops of length 2 (alias a=b b=a) differently to loops of length 1 (alias a=a), length 3 (alias a=b b=c c=a), or length N. The «(( $+seen_alias[$arg] ))» check is redundant as of the last commit: the enclosing condition ensures that $res is "alias", which implies that «(( $+seen_alias[$arg] ))» is false.
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.