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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
```
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SimonSapin committed Nov 8, 2019
1 parent 9a518cf commit f2e7b4ec8ca990ad7c37b0bd1f8215e0456c1206
Showing with 0 additions and 2 deletions.
  1. +0 −1 components/script/dom/bindings/conversions.rs
  2. +0 −1 components/script/lib.rs
@@ -74,7 +74,6 @@ pub trait IDLInterface {
}

/// A trait to mark an IDL interface as deriving from another one.
#[rustc_on_unimplemented(message = "The IDL interface `{Self}` is not derived from `{T}`.")]
pub trait DerivedFrom<T: Castable>: Castable {}

impl<T: Float + ToJSValConvertible> ToJSValConvertible for Finite<T> {
@@ -6,7 +6,6 @@
#![feature(core_intrinsics)]
#![feature(drain_filter)]
#![feature(inner_deref)]
#![feature(on_unimplemented)]
#![feature(plugin)]
#![deny(unsafe_code)]
#![allow(non_snake_case)]

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