I think the best solution is to add uN and sN types where N is not a power of
two, which LLVM should already support.
Then you can write your match like this:
match (val >> 6) as u2
{
...
}
And it will work as desired.
Biggest issue is that to make it work nicely you'd need to add some way to
generalize over the bit-length and integers, and that's going to require
generics with int parameters and work to add those.
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