Unused.foreign: def of bolt@1.27.0.0
Import: import bolt@1.27.0.0/src/rules/suspicious/unused.bend as Unused
Lines 74-85 of bolt@1.27.0.0/src/rules/suspicious/unused.bend: https://jend.leeeet.dev/read.txt?path=bolt@1.27.0.0/src/rules/suspicious/unused.bend&start_line=74&end_line=85

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

# every header line of the defs whose body is `import "./x.c"`, wherever the
# header's `->` and return type fall
def foreign(root: Tree.Node) -> List<&2, U32>:
  match root:
    case Tree.NCons{Tree.Stmt{Tree.SDef{}, +kids, body}, rest}:
      +more = foreign(rest)
      +own = lines(Tree.leaves(kids), more)
      Bool.pick(List<&2, U32>, foreign.opens(body, Bool.not(foreign.ends(kids, False{}))), own, more)
    case Tree.NCons{other, rest}:
      foreign(rest)
    case other:
      Nil{}

Uses (11):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.not
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.pick
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bolt@1.27.0.0/src/rules/suspicious/unused.bend&name=foreign.ends
  https://jend.leeeet.dev/definition.txt?path=bolt@1.27.0.0/src/rules/suspicious/unused.bend&name=foreign.opens
  https://jend.leeeet.dev/definition.txt?path=bolt@1.27.0.0/src/rules/suspicious/unused.bend&name=lines
  https://jend.leeeet.dev/definition.txt?path=bolt@1.27.0.0/src/syntax/tree.bend&name=Node
  https://jend.leeeet.dev/definition.txt?path=bolt@1.27.0.0/src/syntax/tree.bend&name=StmtKind
  https://jend.leeeet.dev/definition.txt?path=bolt@1.27.0.0/src/syntax/tree.bend&name=leaves