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+- Feature Name: non_static_type_id
+- Start Date: 2017-01-08
+- RFC PR: 
+- Rust Issue: 
+
+# Summary
+[summary]: #summary
+
+Remove the `'static` bound from the `type_id` intrinsic so users can experiment with reflection over non-static types.
+
+# Motivation
+[motivation]: #motivation
+
+A common method for storing a map of arbitrary data is to use something like a `HashMap<TypeId, Box<Any>>`. The problem is that a `TypeId` can only be constructed for a static type. This is a reasonable constraint for the stable API, because lifetimes may need to play a part in equality checks by type id. However there are cases where a user is boxing trait objects to work around lifetimes, so they only need to guarantee that data stored with a particular key is of a particular type.
+
+This can be worked around on Rust now by using a trait with an associated type that's expected to be a `'static` version of the implementor:
+
+```rust
+unsafe trait Keyed {
+	type Key: 'static;
+}
+
+struct NonStaticStruct<'a> {
+	a: &'a str
+}
+unsafe impl <'a> Keyed for NonStaticStruct<'a> {
+	type Key = NonStaticStruct<'static>;
+}
+```
+
+The `Keyed` trait needs to be marked as unsafe because it could lead to undefined behaviour if implemented incorrectly and used for transmuting memory.
+
+This RFC proposes simply removing the `'static` bound from the `type_id` intrinsic, leaving the stable `TypeId` and `Any` traits unchanged. That way users who opt-in to unstable intrinsics can build the type equality guarantees they need without waiting for stable API support.
+
+This is an important first step in expanding the tools available to users at runtime to reason about their data. With the ability to fetch a guaranteed unique type id for non-static types, users can build their own `TypeId` or `Any` traits.
+
+# Detailed design
+[design]: #detailed-design
+
+Remove the `'static` bound from the `type_id` intrinsic in `libcore`.
+
+Allowing type ids for non-static types exposes the fact that concrete lifetimes aren't taken into account. This means a type id for `SomeStruct<'a>` will be the same as `SomeStruct<'static>`, even though they're clearly different types.
+
+We can work around this issue by documenting that the `type_id` intrinsic doesn't consider lifetimes, so in the examples above, a caller recieves an id for `SomeStruct<'_>`.
+
+# How We Teach This
+[how-we-teach-this]: #how-we-teach-this
+
+This changes an unstable compiler intrinsic so we don't need to teach it.
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+Removing the `'static` bound means callers may now depend on the fact that `type_id` doesn't consider concrete lifetimes, even though this probably isn't its intended behaviour.
+
+# Alternatives
+[alternatives]: #alternatives
+
+Create a new intrinsic called `runtime_type_id` that's specifically designed ignore concrete lifetimes. This intrinsic would behave exactly as `type_id` does now. Having a totally separate intrinsic means `type_id` could be updated in the future to account for lifetimes without impacting the usecases that specifically ignore them.
+
+# Unresolved questions
+[unresolved]: #unresolved-questions