Curve.head: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/spec/crypto/secp256k1/curve.bend as Curve
Lines 233-236 of bend-collections@1.0.0.0/spec/crypto/secp256k1/curve.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/spec/crypto/secp256k1/curve.bend&start_line=233&end_line=236

import Base

def head(bs: List<&2, U32>) -> U32:
  match bs:
    case Nil{}: 0
    case b <> t: b

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=U32