DlistStorage.prev: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/containers/internal/dlist_storage.bend as DlistStorage
Lines 309-312 of bend-collections@1.0.0.0/src/containers/internal/dlist_storage.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/containers/internal/dlist_storage.bend&start_line=309&end_line=312

import Base
import bend-collections@1.0.0.0/src/containers/types/internal_dlist.bend as E

def prev(~T: Data, s: DList<T>, h: E.Handle) -> DList<T> & Result<&2, &2, E.Error, Maybe<&2, E.Handle>>:
  DL{+tag, +fresh, +free, +count, +head, +tail, +depth, +cap, vals, prevs, nexts} = s
  E.H{+l, +i} = h
  nbr_checked(~T, False{}, U32.is_lt(i, fresh), tag, fresh, free, count, head, tail, depth, cap, vals, prevs, nexts, i, U32.is_eq(l, tag))

Uses (10):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_eq
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_lt
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/containers/internal/dlist_storage.bend&name=DList
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/containers/internal/dlist_storage.bend&name=nbr_checked
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/containers/types/internal_dlist.bend&name=Error
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/containers/types/internal_dlist.bend&name=Handle