Bits.mask: def of bend-kit-bits@0.1.0.1
Import: import bend-kit-bits@0.1.0.1/bits.bend as Bits
Lines 10-11 of bend-kit-bits@0.1.0.1/bits.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-bits@0.1.0.1/bits.bend&start_line=10&end_line=11

import Base

def mask(+n: U32) -> U32:
  (U32.shln(1, U32.to_nat(n)) - 1 : U32)

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.shln
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.sub
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.to_nat