Tracking Issue for deriving Default on enums
#86985
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C-tracking-issue
Category: A tracking issue for an RFC or an unstable feature.
T-libs-api
Relevant to the library API team, which will review and decide on the PR/issue.
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jhpratt
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|
Closing in favor of #87517, which is the one linked to in code. |
Closed
matthiasgoergens
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Apr 5, 2023
The ci of docker-smoke gets errors otherwise:
````
error[E0658]: deriving `Default` on enums is experimental
--> src/passthrough/mod.rs:345:17
|
345 | #[derive(Debug, Default, Clone, Eq, PartialEq)]
| ^^^^^^^
|
= note: see issue #86985 <rust-lang/rust#86985> for more information
= note: this error originates in the derive macro `Default` (in Nightly builds, run with -Z macro-backtrace for more info)
For more information about this error, try `rustc --explain E0658`.
error: could not compile `fuse-backend-rs` due to previous error
make: *** [Makefile:4: build] Error 101
make: *** [Makefile:44: docker-smoke] Error 2
```
jiangliu
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to cloud-hypervisor/fuse-backend-rs
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Apr 9, 2023
The ci of docker-smoke gets errors otherwise:
````
error[E0658]: deriving `Default` on enums is experimental
--> src/passthrough/mod.rs:345:17
|
345 | #[derive(Debug, Default, Clone, Eq, PartialEq)]
| ^^^^^^^
|
= note: see issue #86985 <rust-lang/rust#86985> for more information
= note: this error originates in the derive macro `Default` (in Nightly builds, run with -Z macro-backtrace for more info)
For more information about this error, try `rustc --explain E0658`.
error: could not compile `fuse-backend-rs` due to previous error
make: *** [Makefile:4: build] Error 101
make: *** [Makefile:44: docker-smoke] Error 2
```
nyetwurk
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to Blockdaemon/solana-accountsdb-plugin-kafka
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this issue
Aug 22, 2023
… v0.6.3 flate 1.0.27 - rust-lang/rust#86985 reqwest 0.11.19 requires h2 v0.3.21 which requires rust 1.63.0 petgraph 0.6.4 requires indexmap 2.0.0 which requires hashbrown 0.14.0 and hence rust 1.64.0
don
added a commit
to don/posify
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this issue
Aug 23, 2023
posify(snbc-880np) % cargo run --example match_manufacturer Compiling flate2 v1.0.27 Compiling exr v1.7.0 error[E0658]: deriving `Default` on enums is experimental --> /Users/don/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/flate2-1.0.27/src/gz/mod.rs:90:17 | 90 | #[derive(Debug, Default)] | ^^^^^^^ | = note: see issue #86985 <rust-lang/rust#86985> for more information = note: this error originates in the derive macro `Default` (in Nightly builds, run with -Z macro-backtrace for more info)
fishilico
added a commit
to fishilico/shared
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Jun 13, 2024
On Alpine 3.16 (Rust 1.60.0) and Fedora 34 (Rust 1.61.0):
error[E0658]: deriving `Default` on enums is experimental
--> /root/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/unicode-width-0.1.13/src/lib.rs:204:30
|
204 | #[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
| ^^^^^^^
|
= note: see issue #86985 <rust-lang/rust#86985>
for more information
= note: this error originates in the derive macro `Default` (in
Nightly builds, run with -Z macro-backtrace for more info)
For more information about this error, try `rustc --explain E0658`.
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This is a tracking issue for the RFC 3107.
The feature gate for the issue is
#![feature(derive_default_enum)].About tracking issues
Tracking issues are used to record the overall progress of implementation.
They are also used as hubs connecting to other relevant issues, e.g., bugs or open design questions.
A tracking issue is however not meant for large scale discussion, questions, or bug reports about a feature.
Instead, open a dedicated issue for the specific matter and add the relevant feature gate label.
Steps
#[derive(Default)]on enums with a#[default]attribute #86735Unresolved Questions
#[default]attributes on the same variant be denied?Implementation history
Initial implementation in #86735, which includes the feature gate and necessary errors.
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