> With this change, would you be allowed to write this?
>
> alt fail foo {
>  1 {...}
>  2 {...}
> }

We'll have to rig the parser to not go screwy on 'alt fail { ... }' by
checking whether there is a non-brace token following the fail/cont
and only interpreting it as an alt modifier when there is, but yes,
you'll be able to write this.
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