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+- Feature Name: immediately-usable-extern-crates
+- Start Date: (fill me in with today's date, YYYY-MM-DD)
+- RFC PR: (leave this empty)
+- Rust Issue: (leave this empty)
+
+# Summary
+[summary]: #summary
+
+This RFC reduces redundant boilerplate when including external crates.
+With this change, projects using Cargo
+(or other build systems using the same mechanism)
+will no longer have to specify `extern crate`:
+dependencies added to `Cargo.toml` will be automatically `use`able.
+We continue to support `extern crate` for backwards compatibility
+with the option of phasing it out in future Rust epochs.
+
+# Motivation
+[motivation]: #motivation
+
+One of the principles of Rust is that using external crates should be as
+easy and natural as using the standard library.
+This allows the standard library to be kept small, and allows mature, standard
+solutions to be developed by the community.
+
+Currently, however, external crates must be specified twice: once in a build
+system such as Cargo and again in the source code using `extern crate`.
+When external dependencies are conditional (`cfg`) upon feature flags or the
+target platform, the conditional logic must appear in both `Cargo.toml` and
+the `extern crate` declarations.
+
+This duplication causes unnecessary effort and results in one more opportunity
+for mistakes when working with conditionally-enabled dependencies.
+Allowing the omission of the redundant `extern crate` syntax contributes to the
+roadmap goals of
+[improving Rust's ergonomics](https://github.com/rust-lang/rust-roadmap/issues/17)
+and
+[providing easy access to high-quality crates.](https://github.com/rust-lang/rust-roadmap/issues/9)
+
+# Guide-Level Explanation
+[guide]: #guide
+
+When you add a dependency to your `Cargo.toml`, it is immediately usable within
+the source of your crate. For example, imagine that you needed to print a random
+character. You'd start by adding the `rand` crate to your `Cargo.toml`:
+
+```
+# Cargo.toml:
+name = "my_crate"
+version = "0.1.0"
+authors = ["Me" <me@mail.com>]
+
+[dependencies]
+rand = "0.3"
+```
+
+And then you can immediately `use` the crate:
+
+```rust
+// src/main.rs:
+use rand;
+
+fn main() {
+    let c: char = rand::random();
+    println!("A random character: {}", c);
+}
+```
+
+Alternatively, we can `use` just the specific function we need:
+
+```rust
+use rand::random;
+
+fn main() {
+    let c: char = random();
+    println!("A random character: {}", c);
+}
+```
+
+# Reference-Level Explanation
+[reference]: #reference
+
+External crates can be passed to the rust compiler using the
+`--extern CRATE_NAME=PATH` flag.
+For example, `cargo build`-ing a crate `my_crate` with a dependency on `rand`
+results in a call to rustc that looks something like
+`rustc --crate-name mycrate src/main.rs --extern rand=/path/to/librand.rlib ...`.
+
+When an external crate is specified this way, it will be automatically
+available to any module in the current crate through `use` statements or
+absolute paths (e.g. `::rand::random()`). It will _not_ be automatically
+imported at root level as happens with current `extern crate`.
+None of this behavior will occur when including a library using the `-l`
+or `-L` flags.
+
+We will continue to support the current `extern crate` syntax for backwards
+compatibility. `extern crate foo;` will behave just like it does currently.
+Writing `extern crate foo;` will not affect the availability of `foo` in
+`use` and absolute paths as specified by this RFC.
+
+Additionally, items such as modules, types, or functions that conflict with
+the names of implicitly imported crates will result in a warning and will
+require the external crate to be brought in manually using `extern crate`.
+Note that this is different from the current behavior of the
+implicitly-imported `std` module.
+Currently, creating a root-level item named `std` results in a name conflict
+error. For consistency with other crates, this error will be removed.
+Creating a root-level item named `std` will prevent `std` from being included,
+and will trigger a warning.
+
+It will still be necessary to use the `extern crate` syntax when using
+`#[macro_use]` to import macros from a crate. This is necessary in order to
+prevent macros from being automatically brought into scope and changing the
+behavior of existing code.
+However, as specified in
+[RFC 1561](https://github.com/rust-lang/rfcs/blob/master/text/1561-macro-naming.md#importing-macros),
+macros 2.0 will no longer require `#[macro_use]`, replacing it with
+normal `use` declarations, for which no `extern crate` is required.
+
+One remaining use case of `extern crate` syntax is for aliasing, i.e.
+`extern crate foo as bar;`. In order to support aliasing, a new "alias" key
+will be added to the `Cargo.toml` format.
+Users who want to use the `rand` crate but call it `random` instead can now
+write `rand = { version = "0.3", alias = "random" }`.
+
+When compiling, an external crate is only linked if it is used
+(through either `extern crate`, `use`, or absolute paths).
+This prevents unused crates from being linked, which is helpful in a number of
+scenarios:
+- Some crates have both `lib` and `bin` targets and want to avoid linking both
+`bin` and `lib` dependencies.
+- `no_std` crates need a way to avoid accidentally linking `std`-using crates.
+- Other crates have a large number of possible dependencies (such as
+[the current Rust Playground](https://users.rust-lang.org/t/the-official-rust-playground-now-has-the-top-100-crates-available/11817)),
+and want to avoid linking all of them.
+
+In order to prevent linking of unused crates,
+after macro expansion has occurred, the compiler will resolve
+`use`, `extern crate`, and absolute paths looking for a reference to external
+crates or items within them. Crates which are unreferenced in these paths
+will not be linked.
+
+
+# Alternatives
+[alternatives]: #alternatives
+
+- Don't do this.
+- Specify external dependencies using only `extern crate`, rather than only
+`Cargo.toml`, by using `extern crate foo = "0.2";` or similar. This would
+require either `Cargo` or `rustc` to first scan the source before determining
+the build dependencies of the existing code, a system which requires fairly
+tight coupling between a build system and `rustc`, and which would almost
+certainly interact poorly with third-party build systems.
+
+# Unresolved questions
+[unresolved]: #unresolved-questions
+
+- What interactions does this have with future procedural macros?
+- Should we lint/warn on local items shadowing implicitly imported crates?
+It seems like a useful warning, but it's also a potential
+backwards-compatibility hazard for crates which previously depended on a
+crate, didn't import it with `extern crate`, and had a root-level item with
+an overlapping name (although this seems like an extreme edge case).
+- `extern crate foo` has linking side effects even if `foo` isn't visibly
+used from Rust source. After this change, `use foo;` would have similar
+effects. This seems potentially undesirable-- what's the right way of handling
+crates which are brought in only for their side effects?