def ok

bend-collections@1.0.0.0 · src/math/generic.bend:29

import Base
import bend-collections@1.0.0.0/src/math/num.bend as N

29def ok(-T: Data, m: Maybe<&2, T>) -> Result<&2, &2, N.NumError, T>:
30  match m:
31    case None{}:
32      Fail{N.Overflow{}}
33    case Some{x}:
34      Done{x}