Commits on Nov 8, 2019

1. 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 rust-lang/rust#29642
      = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
   
   error: aborting due to 2 previous errors
   ```

   

   SimonSapin committed Nov 8, 2019
   f2e7b4e

2. Fix some warnings new in Rust Nightly

   

   SimonSapin committed Nov 8, 2019

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