template bug?

[Denton Cockburn]

In DMD 2.011

import std.stdio;

template factorial(real n)
{
	static if (n == 1)
		const factorial = 1;
	else const factorial = n * factorial!(n - 1);
}

void main()
{
	writefln(factorial!(5));
}

produces: -3.10504e+231

when the template is changed to accept an int instead of a real, it
produces the right output: 120

What's the cause of this?

Note: in 1.027, the version accepting a real still produces the correct
output of 120.