Bytes.len: def of lawful-bytes@0.1.1.0
Import: import lawful-bytes@0.1.1.0/bytes.bend as Bytes
Lines 132-135 of lawful-bytes@0.1.1.0/bytes.bend: https://jend.leeeet.dev/read.txt?path=lawful-bytes@0.1.1.0/bytes.bend&start_line=132&end_line=135

import Base
import lawful-bytes@0.1.1.0/defs.bend as D

# The number of bytes in use.
def len(b: D.Bytes) -> D.Bytes & U32:
  D.Bytes{+n, buf} = b
  (D.Bytes{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=lawful-bytes@0.1.1.0/defs.bend&name=Bytes