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version: "2"
services:
  service_a:
    volumes:
      - volume_a:/opt/volume_a
volumes:
  # First attempt - ERROR: In file './docker-compose.dev.yml', volume must be a mapping, not a string.
  volume_a: /path/to/volume:ro
  # Second attempt - ERROR: In file './docker-compose.dev.yml', volume must be a mapping, not an array.
  volume_a: 
    - /path/to/volume:ro