Empty.close.depth: def of bolt@1.27.0.0
Import: import bolt@1.27.0.0/src/rules/suspicious/empty.bend as Empty
Lines 135-148 of bolt@1.27.0.0/src/rules/suspicious/empty.bend: https://jend.leeeet.dev/read.txt?path=bolt@1.27.0.0/src/rules/suspicious/empty.bend&start_line=135&end_line=148

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

# a bracket at the depth: the length's own `)` at depth zero; else the depth
# it leaves
def close.depth(kk: Lex.TokKind, dd: Nat) -> Nat:
  match kk:
    case Lex.TOpen{}:
      1n+dd
    case Lex.TClose{}:
      match dd:
        case 0n:
          0n
        case 1n+p:
          p
    case other:
      dd

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=bolt@1.27.0.0/src/syntax/lex.bend&name=TokKind