is Expression, Type Identifier : TypeSpecialization

[Trass3r]

You are right.

Even this doesn't work:

import std.stdio;

class one { }
class two : one {  }

void main()
{
	static if ( is(two T : one) )
		writeln("test");
}

Additionally it's really strange dmd doesn't complain about TWO and ONE if  
the aliases are omitted.
Seems like two distinct bugs to me.
File bug reports.