Outputs:
  Bucket1:
    Value: !GetAtt Bucket1.Arn # Short GetAtt
  Bucket2: # Bucket comment
    Value:
      Fn::GetAtt: # GetAtt comment
        - Bucket2
        - Arn # Arn comment

# Multiline comment
# starting at indent 0
Resources:
  Bucket2:
    Properties:
      BucketName: !Ref Name # Ref: comment
    Type: "AWS::S3::Bucket"
  Bucket1:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Sub ${Bucket2}-newer
Parameters:
  Name:
    Type: String