Regex.bits.plain: def of bend-kit-regex@0.8.0.0
Import: import bend-kit-regex@0.8.0.0/regex.bend as Regex
Lines 864-872 of bend-kit-regex@0.8.0.0/regex.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-regex@0.8.0.0/regex.bend&start_line=864&end_line=872

import Base

# Word boundaries depend on the chars on both sides, which one mask per set cannot track.
def bits.plain(xs: List<&2, Inst>) -> Bool:
  match xs:
    case Nil{}:
      True{}
    case Con{IAssert{+k}, t}:
      U32.is_lt(k, 2) && bits.plain(t)
    case Con{i, t}:
      bits.plain(t)

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=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_lt
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=Inst