Field.inv: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/crypto/curve25519/field.bend as Field
Lines 246-248 of bend-collections@1.0.0.0/src/crypto/curve25519/field.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/crypto/curve25519/field.bend&start_line=246&end_line=248

import Base

# x^(p - 2) = x^(2^255 - 21): 250 one bits (x, then 249 steps), then 0 1 0 1 1
def inv(+x: List<&2, U32>) -> List<&2, U32>:
  pow_bits(x, [False{}, True{}, False{}, True{}, True{}], pow_ones(x, 249n, x))

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/curve25519/field.bend&name=pow_bits
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/curve25519/field.bend&name=pow_ones