rascal - Is there a construct like `Either`/`Validation`? -
for use case want have either successful result (with value) xor failed result list of errors. in haskell use either
this, in scalaz have validation
. there construct in rascal this?
is see maybe
available, hope either
well.
at moment support maybe
in library, write own either
if want. useful addition our library.
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