Feasible Idea?: Range Tester

[timotheecour]

>>  testing that a conformant range throws a RangeError from 
>> popFront when it's empty (as Nick was suggesting) would not be 
>> correct at this point

ok what about the following: should work regardless it's 
RangeError or an assert(0) in th eparticular implementation of a 
range.

----
bool isThrown(E)(lazy E expression){
         import std.exception;
         import core.exception : RangeError;
	try
		expression();
	catch(RangeError t)	return true;
	catch(Error t)	return true;
	return false;
}
unittest(){
     int[]x;
     assert(isThrown(x[1]));
}
----