Generic.FSum.fold: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/spec/math/generic.bend as Generic
Lines 256-258 of bend-collections-laws-math@1.0.0.0/spec/math/generic.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/spec/math/generic.bend&start_line=256&end_line=258

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

# ((0 + x0) + x1) + ..., every addition rounded
def FSum.fold(~T: Data, ~op: N.Op<T> -> T, ~test: N.Test<T> -> Bool, xs: List<&2, T>) -> Type:
  {G.sum(~T, ~op, ~test, xs) == Done{fold_add(~T, ~op, xs, op(N.ZeroOp{}))} : Result<&2, &2, N.NumError, T>}

Uses (8):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/spec/math/generic.bend&name=fold_add
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/src/math/generic.bend&name=sum
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/src/math/num.bend&name=NumError
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/src/math/num.bend&name=Op
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/src/math/num.bend&name=Test