V: Ability to call variadic functions without any arguments

[thecodrr]

Currently if you call a variadic function without any arguments, it results in quite a verbose error.
e.g.

fn variadic(args ...string){}
fn main(){
   variadic() //error
}

Either this should be handled properly i.e. output a proper error that you cannot call a variadic function without arguments or vargs should be treated as an array and should default to an empty array in case there are no arguments.

[medvednikov]

Indeed, your example should work.

[medvednikov]

Fixed.