int main(char[][] args)
{
  dout.writeLine(toString(1uL,1u));
  assert( toString(12uL,1u).length == 12 );
}

This produces:

  1000000000000000000000000000000000000000000000000000000000000000000000
  Error: Assert Failure example(4)

When I think it should produce

  1

nobody wrote:
> int main(char[][] args)
> {
>   dout.writeLine(toString(1uL,1u));
>   assert( toString(12uL,1u).length == 12 );
> }
> 
> This produces:
> 
>   1000000000000000000000000000000000000000000000000000000000000000000000
>   Error: Assert Failure example(4)
> 
> When I think it should produce
> 
>   1

From the docs: (http://www.digitalmars.com/d/phobos/std_string.html)

------
char[] toString(long value, uint radix);
char[] toString(ulong value, uint radix);
    Convert value to string in radix radix.

    radix must be a value from 2 to 36. [...]
------

So you're just calling it with an invalid parameter value.

Hint: 1 wouldn't be a valid digit in base 1, just like 2 isn't one in base 2, A isn't one in base 10, etc.
So the only valid digit would be 0, and since extra leading zeroes are ignored, the only value that can possibly be represented in base 1 is 0 itself.

nobody schrieb:
> int main(char[][] args)
> {
>   dout.writeLine(toString(1uL,1u));
>   assert( toString(12uL,1u).length == 12 );
> }

I only want to comment that the missing return statement can also be the source of the assertion. Either

void main(){
...
}

or


int main( char[][] args ){
...
return 0;
}