I'd like to implement this soon. Should non-exhaustive alts be errors
or warnings? I guess, if we are to have warnings at all, these are
fine as warnings.
To be able to control these warnings, I'd like to add support for
forms like these:
// I know this is non-exhaustive, fail on non-match
alt fail (foo) {
1 {...}
2 {...}
}
// I know this is non-exhaustive, fall-through without failing on non-match
alt cont (foo) {
1 {...}
2 {...}
}
I think this is more elegant and explicit than requiring people to say
'_ {}' or '_ {fail;}' again and again.
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