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Update description of rustc_on_unimplemented #76

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Jul 14, 2017
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Update description of rustc_on_unimplemented #76

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Update description of rustc_on_unimplemented 
Add description of new feature: substitute `{TraitName}` with full path
for the trait.
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@estebank
estebank committed Jul 5, 2017
commit e65e732742127dec3313af7d1fa5ee06914752e7
6 changes: 4 additions & 2 deletions src/attributes.md
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Expand Up @@ -206,8 +206,10 @@ macro scope.
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.
to implement the trait but doesn't. You can also use the trait's name which will
be replaced with the full path for the trait, for example for the trait `Foo` in
module `Bar`, `{Foo}` can be used and will show up as `Bar::Foo`.
To use this, the `on_unimplemented` feature gate must be enabled.
- `must_use` - on structs and enums, will warn if a value of this type isn't used or
assigned to a variable. You may also include an optional message by using
`#[must_use = "message"]` which will be given alongside the warning.
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