std.parallelism taskPool.map example throws exception

[Jay Norwood via Digitalmars-d-learn]

and, finally, this works using the taskPool.map, as in the 
std.parallelism example.  So, the trick appears to be that the 
call to chomp is needed.

	auto lineRange = File(fn).byLineCopy();
	auto chomped = std.algorithm.map!"a.chomp"(lineRange);
	auto nums = taskPool.map!(to!double)(chomped);
	auto logs = taskPool.map!log10(nums);

	double sum = 0;
	foreach(elem; logs)
	{
		sum += elem;
	}
	writeln("sum=",sum);