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+- Feature Name: inherent-trait-impl
+- Start Date: 2018-03-27
+- RFC PR: (leave this empty)
+- Rust Issue: (leave this empty)
+
+# Summary
+[summary]: #summary
+
+Provides a mechanism to declare "inherent traits" for a type defined in the same crate. Methods on these traits are callable on instances of the specified type without needing to import the trait.
+
+# Motivation
+[motivation]: #motivation
+
+There are two similar cases where this is valuable:
+
+- Frequently used traits.
+
+  Sometimes getting the right abstractions require breaking up a type's implementation into many traits, with only a few methods per
+  trait. Every use of such a type results in a large number of imports to ensure the correct traits are in scope. If such a type is used
+  frequently, then this burden quickly becomes a pain point for users of the API,
+  especially if users do not care about writing generic code over traits.
+
+- Mapping object-oriented APIs.
+
+  When mapping these APIs to rust, base classes are usually mapped to traits: methods on those base classes will need to be callable on any
+  derived type. This is sub-optimal because to use a class method a user must now know which class in the hierachy defined that
+  method, so that they can import and use the corresponding trait. This knowledge is not required when using the same API from an
+  object-oriented language.
+
+# Guide-level explanation
+[guide-level-explanation]: #guide-level-explanation
+
+The feature is implemented using a new attribute which can be applied to trait
+`impl` blocks:
+
+```rust
+pub trait Bar {
+    fn bar(&self);
+}
+
+pub struct Foo;
+
+#[inherent]
+impl Bar for Foo {
+    fn bar(&self) { println!("foo::bar"); }
+}
+
+impl Foo {
+    fn foo(&self) { println!("foo::foo"); }
+}
+```
+
+The method `bar` is now callable on any instance of `Foo`,
+regardless of whether the `Bar` trait is currently in scope,
+or even whether the `Bar` trait is publically visible. In other words if `Bar`
+is defined in one crate and `Foo` in another, the user of `Foo` will be
+able to explicitly depend only on the crate which defines `Foo` and still use
+the inherent trait's methods.
+
+# Reference-level explanation
+[reference-level-explanation]: #reference-level-explanation
+
+The `#[inherent]` attribute in the above example desugars equivalently to an inherent forwarding method (in addition to the trait impl):
+
+```rust
+impl Foo {
+    #[inline]
+    pub fn bar(&self) { <Self as Bar>::bar(self); }
+}
+```
+
+Any questions regarding coherence, visibility or syntax can be resolved by
+comparing against this expansion, although the feature need not be implemented
+as an expansion within the compiler.
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+- Increased complexity of the language.
+- Hides use of traits from users.
+
+# Rationale and alternatives
+[alternatives]: #alternatives
+
+- Define inherent traits either on a type `T` or on an `impl T { .. }` block.
+- Implement as part of the delegation RFC.
+- Do nothing: users may choose to workaround the issue by manually performing the expansion if required.
+
+The most viable alternative is delegation proposal, although arguably inherent
+traits and delegation solve different problems with the similar end result.
+The former allows to use trait methods without importing traits and the latter
+to delegate methods to the selected field. Nethertheless delegation RFC and
+this RFC can be composable with each other:
+
+```Rust
+struct Foo1;
+struct Foo2;
+
+#[inherent]
+impl T1 for Foo1 {
+    fn a() {}
+}
+
+#[inherent]
+impl T2 for Foo2 {
+    fn b() {}
+}
+
+struct Bar {
+    f1: Foo1,
+    f2: Foo2,
+}
+
+impl Bar {
+    // all methods from `T1` will be delegated as well
+    // though `T1` will not be implemented for `Bar`
+    delegate * to f1;
+}
+
+// method `b` will be accessable on `Bar` without importing `T2`
+#[inherent]
+impl T2 for Bar {
+    delegate * to f2;
+}
+```
+
+# Prior art
+[prior-art]: #prior-art
+
+- https://github.com/rust-lang/rfcs/pull/2309 (previous closed PR)
+- https://github.com/rust-lang/rfcs/issues/1880
+- https://github.com/rust-lang/rfcs/issues/1971
+
+# Unresolved questions
+[unresolved]: #unresolved-questions
+
+- Do we want to introduce a new keword instead of using `#[inherent]`? In other
+words do we want to write `inherent impl A for B { .. }`?