Permutation.rotate: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/spec/crypto/keccak/permutation.bend as Permutation
Lines 22-26 of bend-collections@1.0.0.0/spec/crypto/keccak/permutation.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/spec/crypto/keccak/permutation.bend&start_line=22&end_line=26

import Base
import bend-collections@1.0.0.0/src/crypto/keccak/types.bend as T

def rotate(a: T.Lane, +n: Nat) -> T.Lane:
  match a n:
    case T.W{lo,hi} 0n: T.W{lo,hi}
    case T.W{lo,hi} 32n: T.W{hi,lo}
    case T.W{lo,hi} n: rotate_nonzero(lo,hi,n,Nat.is_lt(n,32n))

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.is_lt
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/spec/crypto/keccak/permutation.bend&name=rotate_nonzero
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/keccak/types.bend&name=Lane