D1: Error: function ... cannot have an in contract when overriden function

[jicman via Digitalmars-d-learn]

On Monday, 16 February 2015 at 07:33:54 UTC, Kagamin wrote:
> It checks that you don't set both text and image, because the 
> button doesn't support it.

Yes, I get that. :-)  I am talking about the
in
{
}
and also the
body
{
}
how are these interpreted by the compiler?  They are both part of 
the function, correct?