EntityKey.index: def of bendvy-ecs-core@0.1.0.3
Import: import bendvy-ecs-core@0.1.0.3/entity_key.bend as EntityKey
Lines 9-13 of bendvy-ecs-core@0.1.0.3/entity_key.bend: https://jend.leeeet.dev/read.txt?path=bendvy-ecs-core@0.1.0.3/entity_key.bend&start_line=9&end_line=13

import Base

# Return only the slot index, discarding generation for this observation.
# Equal indices do not establish equal entity identities or valid handles.
def index(key:Key) -> U32:
  match key:
    case EntityKey{index,_}:index

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.3/entity_key.bend&name=Key