dub ldc error _d_array_slice_copy

[SrMordred]

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'