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+- Feature Name: `backward_compatible_default_features`
+- Start Date: 2022-06-23
+- RFC PR: [rust-lang/rfcs#3283](https://github.com/rust-lang/rfcs/pull/3283)
+- Rust Issue: None
+
+# Summary
+[summary]: #summary
+
+Add feature bases as an alternative to `default-features = false` that allows
+adding new default-enabled features for existing functionality.
+
+# Motivation
+[motivation]: #motivation
+
+Currently, crates cannot add new default-enabled features for existing
+functionality. This is a bad thing, because it means that crates cannot allow
+users to opt out of more features, because adding new default-enabled features
+for these would break existing users with `default-features = false`.
+
+To fix this, I propose we add the notion of a feature `base`. Users of crates
+have to select at least one of its base features. This means that in order to
+make another part of a crate optional, people can simply add a new optional
+feature and add it to all existing feature bases. Then they can create another
+feature base that excludes this new optional feature. The syntax of
+`default-features = false` will get replaced by `base = "<feature base>"`, with
+the default being `base = "default"`.
+
+In order to introduce this in a way that works with the existing
+`default-features = false` syntax, `default-features = false` will imply a
+feature base, `no-default-features`.
+
+For example, the warp crate enables HTTP2 by default and would like to make
+that optional. This was done in a PR, but the backward incompatibility was
+noticed (https://github.com/seanmonstar/warp/issues/913) and the PR was
+reverted. With this feature proposal, they could instead add a base called
+`no-default-features = ["http2"]`, so old crates depending on warp still get
+HTTP2 support. People can then opt out of the HTTP2 dependency by specifying a
+feature base like `base = "minimal_v1"`.
+
+# Guide-level explanation
+[guide-level-explanation]: #guide-level-explanation
+
+When wanting to give users of your crate the possibility to opt out of parts of
+the functionality, you can turn to feature bases: Say you have a dependency on
+`large_crate`:
+
+```toml
+[dependencies]
+large_crate = "3.4"
+```
+
+You want to make that dependency optional, but since this would take away parts
+of the functionality of your crate as well, existing users must continue to use
+your crate with that dependency. The solution is to create a new feature base:
+
+```toml
+[package]
+feature-bases = ["minimal_v1"] # "default" is automatically a feature base
+
+[dependencies]
+large_crate = { version = "3.4", optional = true }
+
+[features]
+default = ["large_crate"]
+minimal_v1 = []
+```
+
+Users of your crate can now opt out of the large crate by specifying the
+following in their `Cargo.toml`:
+
+```toml
+[dependencies]
+your_crate = { version = "5.7", base = "minimal_v1" }
+```
+
+## Migration from default-features
+[migration-from-default-features]: #migration-from-default-features
+
+The `default-features = false` feature allowed to do the same migration, but
+only once per major version of a crate. To be backward-compatible with that
+approach, `default-features = false` implies the feature base called
+`default-features-false`.
+
+# Reference-level explanation
+[reference-level-explanation]: #reference-level-explanation
+
+A new key `package.feature-bases` is introduced. This key specifies a list of
+features that, augmented with `default` and `default-features-false`, are
+eligible as to be specified in the `base` key of a dependency.
+
+A new key `base` is introduced for dependencies, its value is a string. It is
+well-formed if it is in the above-mentioned set of possible bases.
+
+The keys `default-features` and `base` on dependencies are mutually exclusive;
+`default-features = false` implies `base = "default-features-false"`.
+
+# Drawbacks
+[drawbacks]: #drawbacks
+
+This specifies one way to solve this problem. It is kind of clear that this
+problem should be solved, the only question is whether this is the right or
+best solution to the problem.
+
+# Rationale and alternatives
+[rationale-and-alternatives]: #rationale-and-alternatives
+
+There is another proposal to fix this problem in [RFC 3146: Cargo feature
+migrations](https://github.com/rust-lang/rfcs/pull/3146).
+
+One upside of this over RFC 3146 is that 
+
+Not doing this lets problems such as the one in
+https://github.com/rust-lang/rfcs/pull/3140#issuecomment-862020840 continue
+happening, not allowing crate authors (or even the standard library) to create
+new default-enabled features for existing functionality:
+
+> The general concept of `infallible_allocation` seems sensible. However, I
+> want to point out a forward-compatibility concern with the proposed way of
+> handling this in cargo, which has also applied to previous proposals that
+> suggest the same thing:
+
+> If crates start declaring dependencies on `std` with `default-features =
+> false`, they'll break if we introduce a new enabled-by-default feature in the
+> future.  We'd likely find that we could never add a new default feature.
+
+> I think, instead, we'd need to have a syntax to say "default minus
+> `infallible_allocations`", which would be forwards-compatible.
+
+# Prior art
+[prior-art]: #prior-art
+
+Slint has done a hack that is similar to this proposal:
+https://slint-ui.com/blog/rust-adding-default-cargo-feature.html.
+
+# Unresolved questions
+[unresolved-questions]: #unresolved-questions
+
+- Should feature bases instead be treated like normal features entirely, with
+  the only difference being that cargo enforces to use at least one of them?
+
+# Future possibilities
+[future-possibilities]: #future-possibilities
+
+No future possibilities were thought of.