dub ldc error _d_array_slice_copy

[SrMordred via Digitalmars-d-learn]

On ubuntu:

void test(size_t l)
{
    char* a;
    a[0 .. l] = a[0 .. l];      
}
extern(C) void main(){
        test(0);
}
ldc2 source/app.d //compiles

dub --compiler=ldc2 //app.d:4: error: undefined reference to 
'_d_array_slice_copy'