Concat.lone: def of bolt@1.27.0.0
Import: import bolt@1.27.0.0/src/rules/suspicious/concat.bend as Concat
Lines 42-48 of bolt@1.27.0.0/src/rules/suspicious/concat.bend: https://jend.leeeet.dev/read.txt?path=bolt@1.27.0.0/src/rules/suspicious/concat.bend&start_line=42&end_line=48

import Base
import bolt@1.27.0.0/src/syntax/lex.bend as Lex
import bolt@1.27.0.0/src/syntax/tree.bend as Tree

# a chain that is exactly one lowercase name: its token
def lone(nn: Tree.Node) -> Maybe<&2, Lex.Tok>:
  match nn:
    case Tree.NCons{h, Tree.NNil{}}:
      lone.name(h)
    case other:
      None{}

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=bolt@1.27.0.0/src/rules/suspicious/concat.bend&name=lone.name
  https://jend.leeeet.dev/definition.txt?path=bolt@1.27.0.0/src/syntax/lex.bend&name=Tok
  https://jend.leeeet.dev/definition.txt?path=bolt@1.27.0.0/src/syntax/tree.bend&name=Node