Hey guys, what does this error mean:
.local/usr/dmd-2.111.0/linux/bin64/../../src/phobos/std/internal/memory.d(39,33): Error: fakePureCalloc cannot be interpreted at compile time, because it has no available source code

I have a class:

import std.container.array : Array;

class Sieve(K, V)
{
    alias kvtuple = Tuple!(K, V);
    struct cdata
    {
        kvtuple data;
        cdata* prev;
        cdata* next;
        bool visited;
    }

    cdata* head, tail, hand;
    Array!(cdata) arr;
    int count, len;

    this(int l = 1021)
    {
        len = l;
        arr.length(len);
    }

    ... do more things
}

works when I do:

Sieve!(string, int) sieve = new Sieve!(string, int); sieve.arr.length(1021);

and remove the constructor.