Trying to pass template arguments just gives you:
Error: template instance leastsq!((p) => p) leastsq is not a template declaration, it is a import
Minty Fresh via Digitalmars-d Wed, 28 Sep 2016 19:06:12 -0700
Trying to pass template arguments just gives you:
Error: template instance leastsq!((p) => p) leastsq is not a template declaration, it is a import