Lots of bool operations shouldn't compile

[Kyle Furlong]

Don Clugston wrote:
> Four examples, although it's only one bug. Almost all operations on bool 
> should be disabled, but I found the ones below a little amusing. None of 
> them should compile, but they all evaluate as "true".
> 
> void main()
> {
>     if (true >= ireal.nan) { writefln("This is kind of ridiculous"); }
>     if (false >= ireal.nan) { writefln("This is kind of ridiculous"); }
>     if (true <> -2i) { writefln("NCEG operators too ??!!"); }
>     if (false != -2i) { writefln("and again"); }
> }

This kind of absurdity is exactly what Derek and others of us have been arguing against. These are a direct result of a non type 
safe boolean.