DependencyPlan.duplicates: def of bendvy-ecs-core@0.1.0.3
Import: import bendvy-ecs-core@0.1.0.3/dependency_plan.bend as DependencyPlan
Lines 31-34 of bendvy-ecs-core@0.1.0.3/dependency_plan.bend: https://jend.leeeet.dev/read.txt?path=bendvy-ecs-core@0.1.0.3/dependency_plan.bend&start_line=31&end_line=34

import Base

def duplicates(~Requirement:Data,nodes:List<&2,Node<Requirement>>) -> Maybe<&2,Invalid<Requirement>>:
  match nodes:
    case []:None{}
    case Node{+id,_} <> +rest:duplicate_step(~Requirement,has(~Requirement,rest,id),id,duplicates(~Requirement,rest))

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.3/dependency_plan.bend&name=Invalid
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.3/dependency_plan.bend&name=Node
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.3/dependency_plan.bend&name=duplicate_step
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.3/dependency_plan.bend&name=has