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+- Feature Name: internal-path-dependencies
+- Start Date: 2017-11-22
+- RFC PR: (leave this empty)
+- Rust Issue: (leave this empty)
+
+# Summary
+[summary]: #summary
+
+This RFC proposes the support for publishing a crate with path dependencies.
+
+# Motivation
+[motivation]: #motivation
+
+Cargo currently does not allow uploading a crate with path dependencies to the
+registry, which means developers cannot utilize path dependencies to better
+organize the code.
+
+Path dependencies can serve as sub-crates of the root crate. This structure can
+help to avoid clustering the specs of all external dependencies in a single
+top-level manifest file. This also ease the work if later we decide to publish
+a standalone path dependency.
+
+With this feature, we don't have to publish path dependencies before the root
+crate is allowed to be published. So path dependencies can be kept internal to
+the project, and all the source code can be bundled into a single crate for
+downloading.
+
+As a result of this, the workspace information will be kept along with the
+published crate, thus large projects can benefit more from it.
+
+# Guide-level explanation
+[guide-level-explanation]: #guide-level-explanation
+
+The manifest value of `package.publish` is `true` by default, which means
+a path dependency is allowed to be published. By setting this value to `false`,
+we can on one hand forbid a standalone crate from being published to the
+registry (by accident), and on the other hand allow its content to be included
+when `cargo package` or `cargo publish` is run.
+
+Say our project "foo" has these files:
+
+```
+foo/Cargo.toml
+foo/src/main.rs
+foo/bar/Cargo.toml
+foo/bar/src/lib.rs
+```
+
+The root crate "foo" depends on the path dependency "bar" in the subdirectory
+`bar/`:
+
+```toml
+# foo/Cargo.toml
+[package]
+name = "foo"
+version = "0.1.0"
+...
+[dependencies.bar]
+path = "bar"
+version = "*"
+```
+
+And we set `package.publish` to `false` in bar's manifest:
+
+```toml
+[package]
+publish = false
+name = "bar"
+version = "1.0.0"
+...
+```
+
+Then we can run `cargo package --list` to see what is included for publishing:
+
+```
+Cargo.toml
+bar/Cargo.toml
+bar/src/lib.rs
+src/main.rs
+```
+
+After `cargo publish --dry-run` we can find these files:
+
+```
+target/package/foo-0.1.0/Cargo.toml
+target/package/foo-0.1.0/Cargo.toml.orig
+target/package/foo-0.1.0/bar/Cargo.toml
+target/package/foo-0.1.0/bar/Cargo.toml.orig
+target/package/foo-0.1.0/bar/src/lib.rs
+target/package/foo-0.1.0/src/main.rs
+target/package/foo-0.1.0.crate
+```
+
+All manifest files are sanitized and reside with their original files `*.orig`.
+
+If you specify the workspace in the manifest, they would be kept as is.
+
+# Reference-level explanation
+[reference-level-explanation]: #reference-level-explanation
+
+N/A
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+This feature (in theory) should not affect any existing projects or other
+functionality of cargo. Only the published contents of the package will be
+changed, i.e. adding source files of path dependencies, recursively.
+
+# Rationale and alternatives
+[alternatives]: #alternatives
+
+There is still no other proposals related to publishing with path dependencies.
+
+Without this feature, a project with path dependencies cannot be uploaded,
+unless the path dependencies are registed at the registry. If developers insist
+publishing internal crates to the registry, then the namespace would get
+polluted. In addition, these separated dependencies lose support of shared
+workspace and thus make it harder to keep the same versions of dependencies.
+
+# Unresolved questions
+[unresolved]: #unresolved-questions
+
+-   Use another manifest key to specify whether path dependencies are included?
+    -   Some people think `package.publish=false` means the source code should
+        not be published or "public" in any way.
+    -   `package.internal=true`?
+-   No restriction for the versions of internal path dependencies?
+-   How should the manifest files be further sanitized?
+-   Exclude path dependencies from Cargo.lock (except their external deps)?
+-   How to organize the generated content of `cargo doc`?