Word64.W64.bits.lo: def of bend-osdev-word64@0.1.1.0
Import: import bend-osdev-word64@0.1.1.0/word64.bend as Word64
Lines 29-39 of bend-osdev-word64@0.1.1.0/word64.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-word64@0.1.1.0/word64.bend&start_line=29&end_line=39

import Base

# Splitting a Word(m + n) into its low m and high n bits (bits are stored
# least significant first), and joining them back. Named under W64, not Word,
# so that they cannot clash with Base if it gains Word.lo, Word.hi or Word.cat.
def W64.bits.lo(m: Nat, n: Nat, w: Word(Nat.add(m, n))) -> Word(m):
  match m:
    case 0n:
      WNil{}
    case 1n+p:
      match w:
        case WCon{h, t}:
          WCon{h, W64.bits.lo(p, n, t)}

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Word
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Word.Con
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Word.Nil