[Bug c/58309] spurious "parameter set but not used" warning in cilk plus array code

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58309

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Another testcase:

int *
fn (int *A, int n, int m)
{
  A[n:m] *= 2;
  return A;
}

I think this is about missing mark_exp_read in c_parser_array_notation.