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auto merge of #20889 : Manishearth/rust/trait-error, r=nikomatsakis

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fixes #20783

r? @nikomatsakis
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bors 2015-01-12 04:45:18 +00:00
commit 0aec4db1c0
11 changed files with 234 additions and 3 deletions
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7
src/doc/reference.md
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@ -2117,6 +2117,13 @@ macro scope.
destructors from being run twice. Destructors might be run multiple times on
the same object with this attribute.
- `doc` - Doc comments such as `/// foo` are equivalent to `#[doc = "foo"]`.
- `rustc_on_unimplemented` - Write a custom note to be shown along with the error
when the trait is found to be unimplemented on a type.
You may use format arguments like `{T}`, `{A}` to correspond to the
types at the point of use corresponding to the type parameters of the
trait of the same name. `{Self}` will be replaced with the type that is supposed
to implement the trait but doesn't. To use this, the `on_unimplemented` feature gate
must be enabled.
### Conditional compilation