All these files should be sourced, not executed; and Debian's lintian complains:
W: zsh-syntax-highlighting: script-not-executable usr/share/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh
Highlight the last character of a «\xHH» escape when it is the last thing in
LBUFFER. This is similar to what b0cc02ed86e3586ab92cc1082fb97b94cd5f584f did
for issue #186.