Reduced code:

-------
struct V
{
    V opSlice(size_t i, size_t j) { return V.init; }
    @property size_t opDollar() { return 1; }
}
struct R
{
    V opIndex(size_t) { return V.init; }
}
struct C
{
    R x() { return R.init; }
}
void main()
{
    C c;
    auto v = c.x[0][0 .. $];
}
-------

Compiler output:

-------
Internal error: dmd/backend/symbol.c 1043
-------