delegate object instead of a literal

[Joel Christensen]

Hi,

This program loops through a string until it finds a number and gives 
the position of it.

The first assert works, but not the second one.

import std.algorithm;

void main() {
        static bool isNumber( char input, char dummy ) {
                if ( ( input >= '0' && input <= '9' ) || input == '.' )
                        return true;
                else
                        return false;
        }
        
        string str = "abc123";
        assert( countUntil!( ( input, b ) {
		if ( ( input >= '0' && input <= '9' ) || input == '.' ) return true; 
else return false;
                } )(str, 0) == 3 ); // works
        assert( countUntil!( isNumber, string, string )( str, 0 ) == 3 );
}

This is the error:
parse.d(15): Error: template instance 
countUntil!(isNumber,string,string) does not match template declaration 
countUntil(alias pred = "a == b",R1,R2) if 
(is(typeof(startsWith!(pred)(haystack,needle))))

- Joel