Scan.when: def of yaml-for-bend@0.1.1.0
Import: import yaml-for-bend@0.1.1.0/scan.bend as Scan
Lines 124-130 of yaml-for-bend@0.1.1.0/scan.bend: https://jend.leeeet.dev/read.txt?path=yaml-for-bend@0.1.1.0/scan.bend&start_line=124&end_line=130

import Base

# +yes+ when +hit+, else +no+; only the one chosen runs.
def when(-A: Type, hit: Bool, yes: Unit -> A, no: Unit -> A) -> A:
  match hit:
    case True{}:
      yes(Unit{})
    case False{}:
      no(Unit{})

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Unit