Machine.Marker: type of bendvy-ecs-core@0.1.0.3
Import: import bendvy-ecs-core@0.1.0.3/machine.bend as Machine
Lines 155-158 of bendvy-ecs-core@0.1.0.3/machine.bend: https://jend.leeeet.dev/read.txt?path=bendvy-ecs-core@0.1.0.3/machine.bend&start_line=155&end_line=158

import Base

# A heterogeneous marker snapshot owns each callback exactly once. Each callback
# captures a Data machine value and closed lenses, never a world/component owner.
type Marker<S: Data,W: Type> is Type:
  Marker{steps: List<&1,(W -> W)>}

Uses (1):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List