warning: use `std::ptr::eq` when comparing raw pointers
       --> src/buffer.rs:136:16
        |
    136 |             if ptr == scope {
        |                ^^^^^^^^^^^^ help: try: `std::ptr::eq(ptr, scope)`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_eq
        = note: `-W clippy::ptr-eq` implied by `-W clippy::all`
        = help: to override `-W clippy::all` add `#[allow(clippy::ptr_eq)]`

    warning: use `std::ptr::eq` when comparing raw pointers
       --> src/buffer.rs:183:9
        |
    183 |         self.ptr == self.scope
        |         ^^^^^^^^^^^^^^^^^^^^^^ help: try: `std::ptr::eq(self.ptr, self.scope)`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_eq

    warning: use `std::ptr::eq` when comparing raw pointers
       --> src/buffer.rs:393:9
        |
    393 |         self.ptr == other.ptr
        |         ^^^^^^^^^^^^^^^^^^^^^ help: try: `std::ptr::eq(self.ptr, other.ptr)`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_eq

    warning: use `std::ptr::eq` when comparing raw pointers
       --> src/buffer.rs:408:5
        |
    408 |     a.scope == b.scope
        |     ^^^^^^^^^^^^^^^^^^ help: try: `std::ptr::eq(a.scope, b.scope)`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_eq

    warning: use `std::ptr::eq` when comparing raw pointers
       --> src/buffer.rs:412:5
        |
    412 |     start_of_buffer(a) == start_of_buffer(b)
        |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `std::ptr::eq(start_of_buffer(a), start_of_buffer(b))`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_eq

The thing that this comment is talking about is called propagate in the
preceding comment.

    warning: lint `clippy::match_on_vec_items` has been removed: `clippy::indexing_slicing` covers indexing and slicing on `Vec<_>`
       --> src/lib.rs:282:5
        |
    282 |     clippy::match_on_vec_items,
        |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
        |
        = note: `#[warn(renamed_and_removed_lints)]` on by default

I'd like to write something like this:

```rust
struct W(syn::Generics);

impl W {
    pub fn as_turbofish(&self) -> syn::Turbofish<'_> {
        self.0.split_for_impl().1.as_turbofish()
    }
}
```

Unfortunately, that doesn't compile today and as far as I can tell it's completely unimplementable -
the lifetime of the `syn::Turbofish` ends up tied to the temporary returned by `split_for_impl`.

That seems silly and unintentional, fix it.

Fix lifetime on `as_turbofish`