Common.length: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/spec/lib/common.bend as Common
Lines 63-68 of bend-collections-laws-math@1.0.0.0/spec/lib/common.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/spec/lib/common.bend&start_line=63&end_line=68

import Base

def length(-A: Data, xs: List<&2, A>) -> Nat:
  match xs:
    case Nil{}:
      0n
    case Con{h, t}:
      1n+length(A, t)

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat