Remove use of on_unimplemented
It errors in today’s Nightly:
```rust
error[E0557]: feature has been removed
--> components/script/lib.rs:9:12
|
9 | #![feature(on_unimplemented)]
| ^^^^^^^^^^^^^^^^ feature has been removed
error[E0658]: this is an internal attribute that will never be stable
--> components/script/dom/bindings/conversions.rs:77:1
|
77 | #[rustc_on_unimplemented(message = "The IDL interface `{Self}` is not derived from `{T}`.")]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: for more information, see https://github.com/rust-lang/rust/issues/29642
= help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
error: aborting due to 2 previous errors
```
It errors in today’s Nightly:
```rust
error[E0557]: feature has been removed
--> components/script/lib.rs:9:12
|
9 | #![feature(on_unimplemented)]
| ^^^^^^^^^^^^^^^^ feature has been removed
error[E0658]: this is an internal attribute that will never be stable
--> components/script/dom/bindings/conversions.rs:77:1
|
77 | #[rustc_on_unimplemented(message = "The IDL interface `{Self}` is not derived from `{T}`.")]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: for more information, see https://github.com/rust-lang/rust/issues/29642
= help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
error: aborting due to 2 previous errors
```
Add support for more array-like types in is_array_like
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Fixes warnings from rust-lang/rust#44229 when `--enable-commonmark` is
passed to rustdoc.
This is mostly a global find-and-replace for bare URIs on lines by
themselves in doc comments.
In a later PR, DomRoot<T> will become a type alias of Root<Dom<T>>,
where Root<T> will be able to handle all the things that need to be
rooted that have a stable traceable address that doesn't move for the
whole lifetime of the root. Stay tuned.
