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Auto merge of #18327 - servo:rustup, r=nox

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Upgrade to rustc 1.21.0-nightly (7eeac1b81 2017-08-30)

Fix this error in the new Rust Nightly:

```rust
   Compiling script v0.0.1 (file:///home/simon/servo2/components/script)
error[E0599]: no method named `trace` found for type `&fn(&dom::node::Node) -> u16` in the current scope
   --> /home/simon/servo2/components/script/dom/treewalker.rs:464:10
    |
464 | #[derive(JSTraceable)]
    |          ^^^^^^^^^^^
    |
    = note: JSTraceable is a function, perhaps you wish to call it
    = help: items from traits can only be used if the trait is implemented and in scope
    = note: the following trait defines an item `trace`, perhaps you need to implement it:
            candidate #1: `dom::bindings::trace::JSTraceable`

error: aborting due to previous error

error: Could not compile `script`.
```

~I’ve tried to reproduce it in a minimal test case, but `impl<A, B> SomeTrait for fn(A) -> B` did not apply for `fn(&u32) -> u32` even on Rust 1.19.0 stable. So I don’t know what changed.~ This is very likely https://github.com/servo/servo/pull/18327.

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This commit is contained in:
bors-servo 2017-09-01 13:54:08 -05:00 • committed by GitHub
commit fd833d9f18
3 changed files with 9 additions and 2 deletions
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7
components/script/dom/bindings/trace.rs
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@ -425,6 +425,13 @@ unsafe impl<A, B> JSTraceable for fn(A) -> B {
}
}
unsafe impl<'a, A, B> JSTraceable for fn(&A) -> B {
#[inline]
unsafe fn trace(&self, _: *mut JSTracer) {
// Do nothing
}
}
unsafe impl<T> JSTraceable for IpcSender<T> where T: for<'de> Deserialize<'de> + Serialize {
#[inline]
unsafe fn trace(&self, _: *mut JSTracer) {