Vec.Vec.len: def of bend-kit-collections@0.1.4.1
Import: import bend-kit-collections@0.1.4.1/vec.bend as Vec
Lines 14-19 of bend-kit-collections@0.1.4.1/vec.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-collections@0.1.4.1/vec.bend&start_line=14&end_line=19

import Base

def Vec.len(~T: Data, v: Vec<T>) -> Vec<T> & U32:
  match v:
    case VNil{}:
      (VNil{}, 0)
    case Vec{+n, buf}:
      (Vec{n, buf}, n)

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/vec.bend&name=Vec