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Replace inheritance_integrity by trait shenanigans

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For each derived DomObject impl, we also generate a dummy trait
ShouldNotImplDomObject that is implemented for all T: DomObject.
We then try to implement it for each field type except the first one.
If compilation succeed, this means that field type doesn't implement
DomObject itself otherwise it would break coherence rules.

error[E0119]: conflicting implementations of trait `dom::xmlhttprequest::_IMPL_DOMOBJECT_FOR_XMLHttpRequest::ShouldNotImplDomObject` for type `((), SomeFieldTypeThatShouldNotImplementDomObject)`:
   --> /Users/nox/src/servo/components/script/dom/xmlhttprequest.rs:120:1
    |
120 | #[dom_struct]
    | ^^^^^^^^^^^^^
    | |
    | first implementation here
    | conflicting implementation for `((), SomeFieldTypeThatShouldNotImplementDomObject)`
This commit is contained in:
Anthony Ramine 2017-02-15 17:48:36 +01:00
parent 37dab8f9f2
commit a6d59d8714
7 changed files with 56 additions and 139 deletions
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3
components/script/dom/bindings/reflector.rs
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@ -27,9 +27,8 @@ pub fn reflect_dom_object<T, U>(
/// A struct to store a reference to the reflector of a DOM object.
#[allow(unrooted_must_root)]
#[must_root]
#[servo_lang = "reflector"]
#[derive(HeapSizeOf)]
#[must_root]
// If you're renaming or moving this field, update the path in plugins::reflector as well
pub struct Reflector {
#[ignore_heap_size_of = "defined and measured in rust-mozjs"]