Compiler errors and recursive nested functions

[Dylan Knutson]

DPaste has stopped responding to requests at the time of writing, 
so here's the code in case its still down by the time someone 
reads this:


----
import std.algorithm : map;
import std.range : isInputRange, ElementType;

// Doesn't work
//template deepMap(alias pred, Range)
//if(isInputRange!Range)
//{
//	static if(isInputRange!(ElementType!Range))
//	{
//		alias deepMap = map!(a => deepMap!(pred, typeof(a))(a));
//	}
//	else
//	{
//		alias deepMap = map!(pred);
//	}
//}

// Neither does this, for the same reason
auto deepMap(alias pred, Range)(Range r)
if(isInputRange!Range)
{
	static if(isInputRange!(ElementType!Range))
	{
		return r.map!( a => a.deepMap!(pred)() )();
	}
	else
	{
		return r.map!(pred)();
	}
}

unittest {
	import std.stdio;

	auto a = [[1, 1], [1, 1]];
	auto b = a.deepMap!(a => a + 1)();
	writeln(b);
	//assert(b == [[2, 2], [2, 2]]);
}

----