enum bool isInputRange = is(typeof(
(inout int = 0)
{
R r = R.init; // can define a range object
if (r.empty) {} // can test for empty
r.popFront(); // can invoke popFront()
auto h = r.front; // can get the front of the range
}));
... is the current implementation in Phobos. But I can't seem to
understand this syntax. What is (inout int = 0)? Why can a block
follow it?
My guess is that this is declaring some sort of function and
testing if it is syntactically valid, but this is still strange
to me.
