Tree.closer: def of bolt@1.27.0.0
Import: import bolt@1.27.0.0/src/syntax/tree.bend as Tree
Lines 137-141 of bolt@1.27.0.0/src/syntax/tree.bend: https://jend.leeeet.dev/read.txt?path=bolt@1.27.0.0/src/syntax/tree.bend&start_line=137&end_line=141

import Base

# the bracket that closes an opener (`>` for `<` and `<&`)
def closer(+oo: String) -> String:
  Bool.pick(String, String.eq(oo, "("), ")",
    Bool.pick(String, String.eq(oo, "["), "]",
      Bool.pick(String, String.eq(oo, "{"), "}", ">")))

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.pick
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.eq