to!string(BigInt, base) doesn't work

[dlangBugzillaToGithub]

bearophile_hugs reported this on 2012-07-31T03:08:41Z

Transfered from https://issues.dlang.org/show_bug.cgi?id=8480

Description

import std.stdio: writeln;
import std.conv: to;
import std.bigint: BigInt;
void main() {
    int base = 6;
    int n1 = 588_225;
    string s1 = to!string(n1, base);
    writeln(s1);
    BigInt n2 = BigInt(n1);
    string s2 = to!string(n2, base);
    writeln(s2);
}


Expected output:

20335133
20335133


But DMD 2.060beta prints:

...\dmd2\src\phobos\std\conv.d(268): Error: template std.conv.toImpl does not match any function template declaration
...\dmd2\src\phobos\std\conv.d(299): Error: template std.conv.toImpl cannot deduce template function from argument types !(string)(BigInt,int)
...\dmd2\src\phobos\std\conv.d(268): Error: template instance toImpl!(string) errors instantiating template
temp.d(10): Error: template instance std.conv.to!(string).to!(BigInt,int) error instantiating