the `test/run-pass/class-trait-bounded-param.rs` test was xfailed and
written in an ancient dialect of Rust so I've just removed it
this also removes `to_vec` from DList because it's provided by
`std::iter::to_vec`
an Iterator implementation is added for OptVec but some transitional
internal iterator methods are still left
I removed the `static-method-test.rs` test because it was heavily based
on `BaseIter` and there are plenty of other more complex uses of static
methods anyway.
There is a pointer to #4760, which is a closed issue. The real issue is
the more general problem described in #4653. Correct the comment.
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
