ExecutionMachineState.retained: def of bendvy-ecs-core@0.1.0.3
Import: import bendvy-ecs-core@0.1.0.3/execution_machine_state.bend as ExecutionMachineState
Lines 56-63 of bendvy-ecs-core@0.1.0.3/execution_machine_state.bend: https://jend.leeeet.dev/read.txt?path=bendvy-ecs-core@0.1.0.3/execution_machine_state.bend&start_line=56&end_line=63

import Base

# Bevy commits State and emits StateTransitionEvent before phase schedules:
# https://github.com/bevyengine/bevy/blob/ad678262ce53b5d142fe49ee5e08caff6f00ab60/crates/bevy_state/src/state/transitions.rs#L138-L205
# Comparator equality retains actual Current; exited/Previous/event use the
# requested value, including when equal values have different representations.
def retained(~V:Data,equal:Bool,from:V,to:V) -> V:
  match equal:
    case True{}:from
    case False{}:to

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