Failed to parse :syntax arguments

[tyru]

via Vimjas/vint#286

syn match     rustIdentifier  contains=rustIdentifierPrime "\%([^[:cntrl:][:space:][:punct:][:digit:]]\|_\)\%([^[:cntrl:][:punct:][:space:]]\|_\)*" display             contained

| is recognized as vim ex command separator.

This can be also reproduced.

syn region  gitcommitUntracked	start=/^# Untracked files:/ end=/^#$\|^#\@!/ contains=gitcommitHeader,gitcommitHead,gitcommitUntrackedFile fold

E492: Not an editor command: ^#\@!/ contains=gitcommitHeader,gitcommitHead,gitcommitUntrackedFile fold (see vim-jp/vim-vimlparser)

[tyru]

oops, duplicated #98