YAML template conversion fails when intrinsic functions using ! are present

[milesjustinr]

Any place using intrinsic functions containing ! instead of Fn:: will fail when converting YAML. The code sample below will fail while the second sample below will succeed. When using JSON format for the template, there is no issue which rules out a template issue.

IsUsEast1: !Equals 
  - !Ref 'AWS::Region'
  - us-east-1

IsUsEast1: 
    Fn::Equals:
    - Fn::Ref 'AWS::Region'
    - us-east-1