[Issue 17930] [Contract Programming] 23.3 In, Out and Inheritance

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https://issues.dlang.org/show_bug.cgi?id=17930

--- Comment #4 from Rob <resmi...@outlook.com> ---
Created attachment 1664
  --> https://issues.dlang.org/attachment.cgi?id=1664&action=edit
demonstrate the requirement for contracts in base in order to have them in
derived

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