diff --git a/.gitignore b/.gitignore
index 6936990..3d69c04 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /target
 **/*.rs.bk
 Cargo.lock
+tags
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..6465433
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,181 @@
+# Welcome to the eyre contributing guide
+
+Thank you for investing your time in contributing to our project! Eyre is a
+community owned and maintained project dedicated to improving the error
+handling and error reporting experience of users of the Rust programming
+language.
+
+Check out our community's[^1] [Code of
+Conduct](https://www.rust-lang.org/policies/code-of-conduct) and feel free to
+say hi on [Discord] if you'd like. It's a nice place to chat about eyre
+development, ask questions, and get to know the other contributors and users in
+a less formal setting.
+
+## The Eyre Organization
+
+The Eyre Organization is the group of people responsible for stewarding the
+Eyre project. It handles things like merging pull requests, choosing project
+direction, managing bugs / issues / feature requests, controlling access to
+secrets, defining and enforcing best practices, etc.
+
+The eyre organization's governance is based on and inspired by
+[sociocracy](https://www.sociocracyforall.org/sociocracy/), the Rust Project,
+and the Bevy Organization. Many thanks to their great examples and resources.
+
+Note that you *do not* need to be a member of the Eyre Organization to
+contribute to Eyre. Community contributors (this means you) can freely open
+issues, submit pull requests, and review pull requests.
+
+### New contributor guide
+
+To get an overview of the project, read the [README](README.md). Here are some
+resources to help you get started with open source contributions:
+
+- [Finding ways to contribute to open source on GitHub](https://docs.github.com/en/get-started/exploring-projects-on-github/finding-ways-to-contribute-to-open-source-on-github)
+- [Set up Git](https://docs.github.com/en/get-started/quickstart/set-up-git)
+- [GitHub flow](https://docs.github.com/en/get-started/quickstart/github-flow)
+- [Collaborating with pull requests](https://docs.github.com/en/github/collaborating-with-pull-requests)
+
+Your first PR will be merged in no time!
+
+No matter how you're helping: thank you for contributing to Eyre!
+
+### Classifying PRs
+
+We use labels to organize our issues and PRs.
+
+Each [label](https://github.com/eyre-rs/eyre/labels) has a prefix denoting its category:
+
+* A: Area or subcrate (e.g. A-eyre, A-color-eyre, A-color-spantrace)
+* C: Category (e.g. C-Breaking-Change, C-Code-Quality, C-Docs)
+* P: Priority (e.g. P-Urgent, P-Important)
+* S: Status (e.g. S-Blocked, S-Controversial, S-Needs-Design)
+* Misc (e.g. "good first issue", "help wanted", "duplicate", "invalid", "wontfix")
+
+## Making changes to Eyre
+
+Most changes don't require much process. If your change is relatively straightforward, just do the following:
+
+1. A community member (that's you!) creates one of the following:
+    * [GitHub Discussions]: An informal discussion with the community. This is
+      the place to start if you want to propose a feature or specific
+      implementation and gathering community wisdom and advice before jumping
+      to solutions.
+    * [Issue](https://github.com/eyre-rs/eyre/issues): A formal way for us to
+      track a bug or feature. Please look for duplicates before opening a new
+      issue and consider starting with a Discussion.
+    * [Pull Request](https://github.com/eyre-rs/eyre/pulls) (or PR for short):
+      A request to merge code changes. This starts our "review process". You
+      are welcome to start with a pull request, but consider starting with an
+      Issue or Discussion for larger changes (or if you aren't certain about a
+      design). We don't want anyone to waste their time on code that didn't
+      have a chance to be merged! But conversely, sometimes PRs are the most
+      efficient way to propose a change. Just use your own judgement here.
+2. Other community members review and comment in an ad-hoc fashion. Active
+   subject matter experts may be pulled into a thread using `@mentions`. If
+   your PR has been quiet for a while and is ready for review, feel free to
+   leave a message to "bump" the thread, or bring it up on [Discord]
+3. Once they're content with the pull request (design, code quality,
+   documentation, tests), individual reviewers leave "Approved" reviews.
+4. After consensus has been reached (typically two approvals from the community
+   or one for extremely simple changes) and CI passes, the
+   [S-Ready-For-Final-Review](https://github.com/eyre-rs/eyre/issues?q=is%3Aopen+is%3Aissue+label%3AS-Ready-For-Final-Review)
+   label is added.
+5. When they find time, someone with merge rights performs a final code review
+   and queue the PR for merging.
+
+## How you can help
+
+If you've made it to this page, you're probably already convinced that Eyre is
+a project you'd like to see thrive. But how can *you* help?
+
+No matter your experience level with Eyre or Rust or your level of commitment,
+there are ways to meaningfully contribute. Take a look at the sections that
+follow to pick a route (or five) that appeal to you.
+
+If you ever find yourself at a loss for what to do, or in need of mentorship or
+advice on how to contribute to Eyre, feel free to ask in [Discord] and one of
+our more experienced community members will be happy to help.
+
+### Writing Handlers
+
+You can improve Eyre's ecosystem by building your own
+[EyreHandler](https://docs.rs/eyre/0.6.8/eyre/trait.EyreHandler.html) crates
+like [color-eyre](https://github.com/eyre-rs/color-eyre/). The customizable
+reporting of `eyre` is it's secret sauce, using that customizability in
+creative ways and sharing your work is one of the best ways you can inspire
+others and help grow our community.
+
+### Fixing bugs
+
+Bugs in Eyre are filed on the issue tracker using the [`C-bug`](https://github.com/eyre-rs/eyre/issues?q=is%3Aissue+is%3Aopen+label%3AC-Bug) label.
+
+If you're looking for an easy place to start, take a look at the [`good first
+issue`](https://github.com/eyre-rs/eyre/labels/good%20first%20issue) label, and
+feel free to ask questions on that issue's thread in question or on [Discord].
+You don't need anyone's permission to try fixing a bug or adding a simple
+feature, but stating that you'd like to tackle an issue can be helpful to avoid
+duplicated work.
+
+When you make a pull request that fixes an issue, include a line that says
+`Fixes #X` (or "Closes"), where `X` is the issue number. This will cause the
+issue in question to be closed when your PR is merged.
+
+General improvements to code quality are also welcome!
+Eyre can always be safer, better tested, and more idiomatic.
+
+### Writing docs
+
+This is incredibly valuable, easily distributed work, but requires a bit of guidance:
+
+* Inaccurate documentation is worse than no documentation: prioritize fixing
+  broken docs.
+* Code documentation (doc examples and in the examples folder) is easier to
+  maintain because the compiler will tell us when it breaks.
+* Inline documentation should be technical and to the point. Link relevant
+  examples or other explanations if broader context is useful.
+
+### Reviewing others' work
+
+Reviewing others work with the aim of improving it is one of the most helpful
+things you can do. You don't need to be an Elder Rustacean to be useful here:
+anyone can catch missing tests, unclear docs, logic errors, and so on. If you
+have specific skills (e.g. advanced familiarity with `unsafe` code, rendering
+knowledge or web development experience) or personal experience with a problem,
+try to prioritize those areas to ensure we can get appropriate expertise where
+we need it.
+
+Focus on giving constructive, actionable feedback that results in real
+improvements to code quality or end-user experience. If you don't understand
+why an approach was taken, please ask!
+
+Provide actual code suggestions when that is helpful. Small changes work well
+as comments or in-line suggestions on specific lines of codes. Larger changes
+deserve a comment in the main thread, or a pull request to the original
+author's branch (but please mention that you've made one).
+
+Once you're happy with the work and feel you're reasonably qualified to assess
+quality in this particular area, leave your `Approved` review on the PR. If
+you're new to GitHub, check out the [Pull Request Review
+documentation](https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/about-pull-request-reviews).
+Anyone can leave reviews ... no special permissions are required!
+
+There are three main places you can check for things to review:
+
+1. Pull request which are ready and in need of more reviews on
+   [eyre](https://github.com/eyre-rs/eyre/pulls?q=is%3Aopen+is%3Apr+-label%3AS-Ready-For-Final-Review+-draft%3A%3Atrue+-label%3AS-Needs-RFC+-reviewed-by%3A%40me+-author%3A%40me)
+2. Pull requests on [eyre](https://github.com/eyre-rs/eyre/pulls) and the
+   [color-eyre](https://github.com/eyre-rs/color-eyre/pulls) repos.
+
+Not even our Circle Members are exempt from reviews! By giving feedback on this
+work (and related supporting work), you can help us make sure our releases are
+both high-quality and timely.
+
+Finally, if nothing brings you more satisfaction than seeing every last issue
+labeled and all resolved issues closed, feel free to message any Eyre Circle
+Member (currently @yaahc) for the triage role to help us keep things tidy. This
+role only requires good faith and a basic understanding of our development
+process.
+
+[Discord]: https://discord.gg/z94RqmUTKB
+[^1]: Okay, I'll admit it, it's really just the Rust Project's CoC :sweat_smile:
diff --git a/README.md b/README.md
index 6215eea..7a27f01 100644
--- a/README.md
+++ b/README.md
@@ -174,23 +174,9 @@ avoid using `eyre::Report` as your public error type.
 
 ## No-std support
 
-**NOTE**: tests are currently broken for `no_std` so I cannot guarantee that
-everything works still. I'm waiting for upstream fixes to be merged rather than
-fixing them myself, so bear with me.
-
-In no_std mode, the same API is almost all available and works the same way. To
-depend on Eyre in no_std mode, disable our default enabled "std" feature in
-Cargo.toml. A global allocator is required.
-
-```toml
-[dependencies]
-eyre = { version = "0.6", default-features = false }
-```
-
-Since the `?`-based error conversions would normally rely on the
-`std::error::Error` trait which is only available through std, no_std mode will
-require an explicit `.map_err(Report::msg)` when working with a non-Eyre error
-type inside a function that returns Eyre's error type.
+No-std support was removed in 2020 in [commit 608a16a] due to unaddressed upstream breakages.
+[commit 608a16a]:
+https://github.com/eyre-rs/eyre/pull/29/commits/608a16aa2c2c27eca6c88001cc94c6973c18f1d5
 
 ## Comparison to failure
 
@@ -225,24 +211,30 @@ implies that you're creating a new error that saves the old error as its
 `source`. With `Option` there is no source error to wrap, so `wrap_err` ends up
 being somewhat meaningless.
 
-Instead `eyre` intends for users to use the combinator functions provided by
-`std` for converting `Option`s to `Result`s. So where you would write this with
+Instead `eyre` offers [`OptionExt::ok_or_eyre`] to yield _static_ errors from `None`,
+and intends for users to use the combinator functions provided by
+`std`, converting `Option`s to `Result`s, for _dynamic_ errors.
+So where you would write this with
 anyhow:
 
+[`OptionExt::ok_or_eyre`]: https://docs.rs/eyre/latest/eyre/trait.OptionExt.html#tymethod.ok_or_eyre
+
 ```rust
 use anyhow::Context;
 
 let opt: Option<()> = None;
-let result = opt.context("new error message");
+let result_static = opt.context("static error message");
+let result_dynamic = opt.with_context(|| format!("{} error message", "dynamic"));
 ```
 
 With `eyre` we want users to write:
 
 ```rust
-use eyre::{eyre, Result};
+use eyre::{eyre, OptionExt, Result};
 
 let opt: Option<()> = None;
-let result: Result<()> = opt.ok_or_else(|| eyre!("new error message"));
+let result_static: Result<()> = opt.ok_or_eyre("static error message");
+let result_dynamic: Result<()> = opt.ok_or_else(|| eyre!("{} error message", "dynamic"));
 ```
 
 **NOTE**: However, to help with porting we do provide a `ContextCompat` trait which
diff --git a/color-spantrace/CHANGELOG.md b/color-spantrace/CHANGELOG.md
index 3014914..1d3bcb0 100644
--- a/color-spantrace/CHANGELOG.md
+++ b/color-spantrace/CHANGELOG.md
@@ -8,6 +8,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased] - ReleaseDate
 
+## [0.2.1] - 2023-11-17
+### Fixed
+- Add license files [by erickt](https://github.com/eyre-rs/color-spantrace/pull/19)
+
 ## [0.2.0] - 2022-01-12
 ### Changed
 - Updated dependency versions to match latest tracing versions
@@ -22,7 +26,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Support custom color themes for spantrace format
 
 <!-- next-url -->
-[Unreleased]: https://github.com/eyre-rs/color-spantrace/compare/v0.2.0...HEAD
+[Unreleased]: https://github.com/eyre-rs/color-spantrace/compare/v0.2.1...HEAD
+[0.2.1]: https://github.com/eyre-rs/color-spantrace/compare/v0.2.0...v0.2.1
 [0.2.0]: https://github.com/eyre-rs/color-spantrace/compare/v0.1.6...v0.2.0
 [0.1.6]: https://github.com/eyre-rs/color-spantrace/compare/v0.1.5...v0.1.6
 [v0.1.5]: https://github.com/eyre-rs/color-spantrace/releases/tag/v0.1.5
diff --git a/color-spantrace/Cargo.toml b/color-spantrace/Cargo.toml
index 1707fc2..79e6b8a 100644
--- a/color-spantrace/Cargo.toml
+++ b/color-spantrace/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "color-spantrace"
-version = "0.2.0"
+version = "0.2.1"
 description = "A pretty printer for tracing_error::SpanTrace based on color-backtrace"
 documentation = "https://docs.rs/color-spantrace"
 
@@ -26,43 +26,5 @@ ansi-parser = "0.8" # used for testing color schemes
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
-[package.metadata.release]
-dev-version = false
-
-[[package.metadata.release.pre-release-replacements]]
-file = "CHANGELOG.md"
-search = "Unreleased"
-replace="{{version}}"
-
-[[package.metadata.release.pre-release-replacements]]
-file = "src/lib.rs"
-search = "#!\\[doc\\(html_root_url.*"
-replace = "#![doc(html_root_url = \"https://docs.rs/{{crate_name}}/{{version}}\")]"
-exactly = 1
-
-[[package.metadata.release.pre-release-replacements]]
-file = "CHANGELOG.md"
-search = "\\.\\.\\.HEAD"
-replace="...{{tag_name}}"
-exactly = 1
-
-[[package.metadata.release.pre-release-replacements]]
-file = "CHANGELOG.md"
-search = "ReleaseDate"
-replace="{{date}}"
-
-[[package.metadata.release.pre-release-replacements]]
-file="CHANGELOG.md"
-search="<!-- next-header -->"
-replace="<!-- next-header -->\n\n## [Unreleased] - ReleaseDate"
-exactly=1
-
-[[package.metadata.release.pre-release-replacements]]
-file="CHANGELOG.md"
-search="<!-- next-url -->"
-replace="<!-- next-url -->\n[Unreleased]: https://github.com/eyre-rs/{{crate_name}}/compare/{{tag_name}}...HEAD"
-exactly=1
-
-[[example]]
-name = "color-spantrace-usage"
-path = "examples/usage.rs"
+[package.metadata.workspaces]
+independent = true
diff --git a/color-spantrace/README.md b/color-spantrace/README.md
index ce25bea..7205e61 100644
--- a/color-spantrace/README.md
+++ b/color-spantrace/README.md
@@ -58,7 +58,7 @@ println!("{}", color_spantrace::colorize(&span_trace));
 
 ## Example
 
-This example is taken from `examples/usage.rs`:
+This example is taken from `examples/color-spantrace-usage.rs`:
 
 ```rust
 use tracing::instrument;
diff --git a/color-spantrace/build.rs b/color-spantrace/build.rs
new file mode 100644
index 0000000..aae2878
--- /dev/null
+++ b/color-spantrace/build.rs
@@ -0,0 +1,53 @@
+use std::env;
+use std::ffi::OsString;
+use std::process::Command;
+use std::str;
+
+fn main() {
+    let version = match rustc_version_info() {
+        Some(version) => version,
+        None => return,
+    };
+    version.toolchain.set_feature();
+}
+
+#[derive(PartialEq)]
+enum Toolchain {
+    Stable,
+    Beta,
+    Nightly,
+}
+
+impl Toolchain {
+    fn set_feature(self) {
+        match self {
+            Toolchain::Nightly => println!("cargo:rustc-cfg=nightly"),
+            Toolchain::Beta => println!("cargo:rustc-cfg=beta"),
+            Toolchain::Stable => println!("cargo:rustc-cfg=stable"),
+        }
+    }
+}
+
+struct VersionInfo {
+    toolchain: Toolchain,
+}
+
+fn rustc_version_info() -> Option<VersionInfo> {
+    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
+    let output = Command::new(rustc).arg("--version").output().ok()?;
+    let version = str::from_utf8(&output.stdout).ok()?;
+    let mut pieces = version.split(['.', ' ', '-']);
+    if pieces.next() != Some("rustc") {
+        return None;
+    }
+    let _major: u32 = pieces.next()?.parse().ok()?;
+    let _minor: u32 = pieces.next()?.parse().ok()?;
+    let _patch: u32 = pieces.next()?.parse().ok()?;
+    let toolchain = match pieces.next() {
+        Some("beta") => Toolchain::Beta,
+        Some("nightly") => Toolchain::Nightly,
+        _ => Toolchain::Stable,
+    };
+    let version = VersionInfo { toolchain };
+    Some(version)
+}
diff --git a/color-spantrace/examples/usage.rs b/color-spantrace/examples/color-spantrace-usage.rs
similarity index 100%
rename from color-spantrace/examples/usage.rs
rename to color-spantrace/examples/color-spantrace-usage.rs
diff --git a/color-spantrace/src/lib.rs b/color-spantrace/src/lib.rs
index 7d51313..214799b 100644
--- a/color-spantrace/src/lib.rs
+++ b/color-spantrace/src/lib.rs
@@ -45,25 +45,29 @@
 //!
 //! ## Output Format
 //!
-//! Running `examples/usage.rs` from the `color-spantrace` repo produces the following output:
+//! Running `examples/color-spantrace-usage.rs` from the `color-spantrace` repo produces the following output:
 //!
-//! <pre><font color="#4E9A06"><b>❯</b></font> cargo run --example usage
+//! <pre><font color="#4E9A06"><b>❯</b></font> cargo run --example color-spantrace-usage
 //! <font color="#4E9A06"><b>    Finished</b></font> dev [unoptimized + debuginfo] target(s) in 0.04s
-//! <font color="#4E9A06"><b>     Running</b></font> `target/debug/examples/usage`
+//! <font color="#4E9A06"><b>     Running</b></font> `target/debug/examples/color-spantrace-usage`
 //! ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SPANTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 //!
-//!  0: <font color="#F15D22">usage::two</font>
-//!     at <font color="#75507B">examples/usage.rs</font>:<font color="#75507B">18</font>
-//!  1: <font color="#F15D22">usage::one</font> with <font color="#34E2E2">i=42</font>
-//!     at <font color="#75507B">examples/usage.rs</font>:<font color="#75507B">13</font></pre>
+//!  0: <font color="#F15D22">color-spantrace-usage::two</font>
+//!     at <font color="#75507B">examples/color-spantrace-usage.rs</font>:<font color="#75507B">18</font>
+//!  1: <font color="#F15D22">color-spantrace-usage::one</font> with <font color="#34E2E2">i=42</font>
+//!     at <font color="#75507B">examples/color-spantrace-usage.rs</font>:<font color="#75507B">13</font></pre>
 //!
 //! [`tracing_error::SpanTrace`]: https://docs.rs/tracing-error/*/tracing_error/struct.SpanTrace.html
 //! [`color-backtrace`]: https://github.com/athre0z/color-backtrace
-#![doc(html_root_url = "https://docs.rs/color-spantrace/0.2.0")]
+#![doc(html_root_url = "https://docs.rs/color-spantrace/0.2.1")]
+#![cfg_attr(
+    nightly,
+    feature(rustdoc_missing_doc_code_examples),
+    warn(rustdoc::missing_doc_code_examples)
+)]
 #![warn(
     missing_debug_implementations,
     missing_docs,
-    rustdoc::missing_doc_code_examples,
     rust_2018_idioms,
     unreachable_pub,
     bad_style,
@@ -74,7 +78,6 @@
     overflowing_literals,
     path_statements,
     patterns_in_fns_without_body,
-    private_in_public,
     unconditional_recursion,
     unused,
     unused_allocation,
diff --git a/eyre/CHANGELOG.md b/eyre/CHANGELOG.md
index 2ca4285..9a75a23 100644
--- a/eyre/CHANGELOG.md
+++ b/eyre/CHANGELOG.md
@@ -8,47 +8,78 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased] - ReleaseDate
 
+## [0.6.10] - 2023-12-07
+### Fixed
+- stale references to `Error` in docstrings [by birkenfeld](https://github.com/eyre-rs/eyre/pull/87)
+
+### Added
+- one-argument ensure!($expr) [by sharnoff](https://github.com/eyre-rs/eyre/pull/86)
+- documentation on the performance characteristics of `wrap_err` vs `wrap_err_with` [by akshayknarayan](https://github.com/eyre-rs/eyre/pull/93)
+    - tl;dr: `wrap_err_with` is faster unless the constructed error object already exists
+- automated conversion to external errors for ensure! and bail! [by j-baker](https://github.com/eyre-rs/eyre/pull/95)
+- eyre::Ok for generating eyre::Ok() without fully specifying the type [by kylewlacy](https://github.com/eyre-rs/eyre/pull/91)
+- `OptionExt::ok_or_eyre` for yielding static `Report`s from `None` [by LeoniePhiline](https://github.com/eyre-rs/eyre/pull/125)
+
+### New Contributors
+- @sharnoff made their first contribution in https://github.com/eyre-rs/eyre/pull/86
+- @akshayknarayan made their first contribution in https://github.com/eyre-rs/eyre/pull/93
+- @j-baker made their first contribution in https://github.com/eyre-rs/eyre/pull/95
+- @kylewlacy made their first contribution in https://github.com/eyre-rs/eyre/pull/91
+- @LeoniePhiline made their first contribution in https://github.com/eyre-rs/eyre/pull/129
+
+## [0.6.9] - 2023-11-17
+### Fixed
+- stacked borrows when dropping [by TimDiekmann](https://github.com/eyre-rs/eyre/pull/81)
+- miri validation errors through now stricter provenance [by ten3roberts](https://github.com/eyre-rs/eyre/pull/103)
+- documentation on no_std support [by thenorili](https://github.com/eyre-rs/eyre/pull/111)
+
+### Added
+- monorepo for eyre-related crates [by pksunkara](https://github.com/eyre-rs/eyre/pull/104), [[2]](https://github.com/eyre-rs/eyre/pull/105)[[3]](https://github.com/eyre-rs/eyre/pull/107)
+- CONTRIBUTING.md [by yaahc](https://github.com/eyre-rs/eyre/pull/99)
+
 ## [0.6.8] - 2022-04-04
 ### Added
-- Add `#[must_use]` to `Report`
-- Add `must-install` feature to help reduce binary sizes when using a custom `EyreHandler`
+- `#[must_use]` to `Report`
+- `must-install` feature to help reduce binary sizes when using a custom `EyreHandler`
 
 ## [0.6.7] - 2022-02-24
 ### Fixed
-- added missing track_caller annotation to new format arg capture constructor
+- missing track_caller annotation to new format arg capture constructor
 
 ## [0.6.6] - 2022-01-19
 ### Added
-- add support for format arguments capture on 1.58 and later
+- support for format arguments capture on 1.58 and later
 
 ## [0.6.5] - 2021-01-05
 ### Added
-- add optional support for converting into `pyo3` exceptions
+- optional support for converting into `pyo3` exceptions
 
 ## [0.6.4] - 2021-01-04
 ### Fixed
-- added missing track_caller annotations to `wrap_err` related trait methods
+- missing track_caller annotations to `wrap_err` related trait methods
 
 ## [0.6.3] - 2020-11-10
 ### Fixed
-- added missing track_caller annotation to autoref specialization functions
+- missing track_caller annotation to autoref specialization functions
 
 ## [0.6.2] - 2020-10-27
 ### Fixed
-- added missing track_caller annotation to new_adhoc function
+- missing track_caller annotation to new_adhoc function
 
 ## [0.6.1] - 2020-09-28
 ### Added
-- support track_caller on rust versions where it is available
+- support for track_caller on rust versions where it is available
 
 
 <!-- next-url -->
-[Unreleased]: https://github.com/eyre-rs/eyre/compare/v0.6.8...HEAD
-[0.6.8]: https://github.com/eyre-rs/eyre/compare/v0.6.7...v0.6.8
-[0.6.7]: https://github.com/eyre-rs/eyre/compare/v0.6.6...v0.6.7
-[0.6.6]: https://github.com/eyre-rs/eyre/compare/v0.6.5...v0.6.6
-[0.6.5]: https://github.com/eyre-rs/eyre/compare/v0.6.4...v0.6.5
-[0.6.4]: https://github.com/eyre-rs/eyre/compare/v0.6.3...v0.6.4
-[0.6.3]: https://github.com/eyre-rs/eyre/compare/v0.6.2...v0.6.3
-[0.6.2]: https://github.com/eyre-rs/eyre/compare/v0.6.1...v0.6.2
-[0.6.1]: https://github.com/eyre-rs/eyre/releases/tag/v0.6.1
+[Unreleased]: https://github.com/eyre-rs/eyre/compare/v0.6.10...HEAD
+[0.6.10]: https://github.com/eyre-rs/eyre/compare/v0.6.9...v0.6.10
+[0.6.9]:  https://github.com/eyre-rs/eyre/compare/v0.6.8...v0.6.9
+[0.6.8]:  https://github.com/eyre-rs/eyre/compare/v0.6.7...v0.6.8
+[0.6.7]:  https://github.com/eyre-rs/eyre/compare/v0.6.6...v0.6.7
+[0.6.6]:  https://github.com/eyre-rs/eyre/compare/v0.6.5...v0.6.6
+[0.6.5]:  https://github.com/eyre-rs/eyre/compare/v0.6.4...v0.6.5
+[0.6.4]:  https://github.com/eyre-rs/eyre/compare/v0.6.3...v0.6.4
+[0.6.3]:  https://github.com/eyre-rs/eyre/compare/v0.6.2...v0.6.3
+[0.6.2]:  https://github.com/eyre-rs/eyre/compare/v0.6.1...v0.6.2
+[0.6.1]:  https://github.com/eyre-rs/eyre/releases/tag/v0.6.1
diff --git a/eyre/Cargo.toml b/eyre/Cargo.toml
index afa349d..6f69924 100644
--- a/eyre/Cargo.toml
+++ b/eyre/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "eyre"
-version = "0.6.8"
+version = "0.6.10"
 authors = ["David Tolnay <dtolnay@gmail.com>", "Jane Lusby <jlusby42@gmail.com>"]
 description = "Flexible concrete Error Reporting type built on std::error::Error with customizable Reports"
 documentation = "https://docs.rs/eyre"
@@ -20,7 +20,7 @@ track-caller = []
 [dependencies]
 indenter = { workspace = true }
 once_cell = { workspace = true }
-pyo3 = { version = "0.13", optional = true, default-features = false }
+pyo3 = { version = "0.20", optional = true, default-features = false }
 
 [dev-dependencies]
 futures = { version = "0.3", default-features = false }
@@ -30,45 +30,12 @@ trybuild = { version = "1.0.19", features = ["diff"] }
 backtrace = "0.3.46"
 anyhow = "1.0.28"
 syn = { version = "2.0", features = ["full"] }
-pyo3 = { version = "0.13", default-features = false, features = ["auto-initialize"] }
+pyo3 = { version = "0.20", default-features = false, features = ["auto-initialize"] }
 
 [package.metadata.docs.rs]
 targets = ["x86_64-unknown-linux-gnu"]
 rustdoc-args = ["--cfg", "doc_cfg"]
 
-[package.metadata.release]
-dev-version = false
+[package.metadata.workspaces]
+independent = true
 
-[[package.metadata.release.pre-release-replacements]]
-file = "CHANGELOG.md"
-search = "Unreleased"
-replace = "{{version}}"
-
-[[package.metadata.release.pre-release-replacements]]
-file = "src/lib.rs"
-search = "#!\\[doc\\(html_root_url.*"
-replace = "#![doc(html_root_url = \"https://docs.rs/{{crate_name}}/{{version}}\")]"
-exactly = 1
-
-[[package.metadata.release.pre-release-replacements]]
-file = "CHANGELOG.md"
-search = "\\.\\.\\.HEAD"
-replace = "...{{tag_name}}"
-exactly = 1
-
-[[package.metadata.release.pre-release-replacements]]
-file = "CHANGELOG.md"
-search = "ReleaseDate"
-replace = "{{date}}"
-
-[[package.metadata.release.pre-release-replacements]]
-file = "CHANGELOG.md"
-search = "<!-- next-header -->"
-replace = "<!-- next-header -->\n\n## [Unreleased] - ReleaseDate"
-exactly = 1
-
-[[package.metadata.release.pre-release-replacements]]
-file = "CHANGELOG.md"
-search = "<!-- next-url -->"
-replace = "<!-- next-url -->\n[Unreleased]: https://github.com/eyre-rs/{{crate_name}}/compare/{{tag_name}}...HEAD"
-exactly = 1
diff --git a/eyre/build.rs b/eyre/build.rs
index 60371ab..e0b2d29 100644
--- a/eyre/build.rs
+++ b/eyre/build.rs
@@ -1,4 +1,5 @@
 use std::env;
+use std::ffi::OsString;
 use std::fs;
 use std::path::Path;
 use std::process::{Command, ExitStatus};
@@ -55,16 +56,18 @@ fn main() {
         _ => {}
     }
 
-    let rustc = match rustc_minor_version() {
-        Some(rustc) => rustc,
+    let version = match rustc_version_info() {
+        Some(version) => version,
         None => return,
     };
 
-    if rustc < 52 {
+    version.toolchain.set_feature();
+
+    if version.minor < 52 {
         println!("cargo:rustc-cfg=eyre_no_fmt_arguments_as_str");
     }
 
-    if rustc < 58 {
+    if version.minor < 58 {
         println!("cargo:rustc-cfg=eyre_no_fmt_args_capture");
     }
 }
@@ -86,13 +89,44 @@ fn compile_probe(probe: &str) -> Option<ExitStatus> {
         .ok()
 }
 
-fn rustc_minor_version() -> Option<u32> {
-    let rustc = env::var_os("RUSTC")?;
+// TODO factor this toolchain parsing and related tests into its own file
+#[derive(PartialEq)]
+enum Toolchain {
+    Stable,
+    Beta,
+    Nightly,
+}
+impl Toolchain {
+    fn set_feature(self) {
+        match self {
+            Toolchain::Nightly => println!("cargo:rustc-cfg=nightly"),
+            Toolchain::Beta => println!("cargo:rustc-cfg=beta"),
+            Toolchain::Stable => println!("cargo:rustc-cfg=stable"),
+        }
+    }
+}
+
+struct VersionInfo {
+    minor: u32,
+    toolchain: Toolchain,
+}
+
+fn rustc_version_info() -> Option<VersionInfo> {
+    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
     let output = Command::new(rustc).arg("--version").output().ok()?;
     let version = str::from_utf8(&output.stdout).ok()?;
-    let mut pieces = version.split('.');
-    if pieces.next() != Some("rustc 1") {
+    let mut pieces = version.split(['.', ' ', '-']);
+    if pieces.next() != Some("rustc") {
         return None;
     }
-    pieces.next()?.parse().ok()
+    let _major: u32 = pieces.next()?.parse().ok()?;
+    let minor = pieces.next()?.parse().ok()?;
+    let _patch: u32 = pieces.next()?.parse().ok()?;
+    let toolchain = match pieces.next() {
+        Some("beta") => Toolchain::Beta,
+        Some("nightly") => Toolchain::Nightly,
+        _ => Toolchain::Stable,
+    };
+    let version = VersionInfo { minor, toolchain };
+    Some(version)
 }
diff --git a/eyre/examples/usage.rs b/eyre/examples/eyre-usage.rs
similarity index 100%
rename from eyre/examples/usage.rs
rename to eyre/examples/eyre-usage.rs
diff --git a/eyre/src/lib.rs b/eyre/src/lib.rs
index 35a9026..5c8d815 100644
--- a/eyre/src/lib.rs
+++ b/eyre/src/lib.rs
@@ -236,23 +236,9 @@
 //!
 //! ## No-std support
 //!
-//! **NOTE**: tests are currently broken for `no_std` so I cannot guarantee that
-//! everything works still. I'm waiting for upstream fixes to be merged rather than
-//! fixing them myself, so bear with me.
-//!
-//! In no_std mode, almost all the API is available and works the same way. To
-//! depend on Eyre in no_std mode, disable our default enabled "std" feature in
-//! Cargo.toml. A global allocator is required.
-//!
-//! ```toml
-//! [dependencies]
-//! eyre = { version = "0.6", default-features = false }
-//! ```
-//!
-//! Since the `?`-based error conversions would normally rely on the
-//! `std::error::Error` trait which is only available through std, no_std mode will
-//! require an explicit `.map_err(Report::msg)` when working with a non-Eyre error
-//! type inside a function that returns Eyre's error type.
+//! No-std support was removed in 2020 in [commit 608a16a] due to unaddressed upstream breakages.
+//! [commit 608a16a]:
+//! https://github.com/eyre-rs/eyre/pull/29/commits/608a16aa2c2c27eca6c88001cc94c6973c18f1d5
 //!
 //! ## Comparison to failure
 //!
@@ -287,27 +273,31 @@
 //! `source`. With `Option` there is no source error to wrap, so `wrap_err` ends up
 //! being somewhat meaningless.
 //!
-//! Instead `eyre` intends for users to use the combinator functions provided by
-//! `std` for converting `Option`s to `Result`s. So where you would write this with
+//! Instead `eyre` offers [`OptionExt::ok_or_eyre`] to yield _static_ errors from `None`,
+//! and intends for users to use the combinator functions provided by
+//! `std`, converting `Option`s to `Result`s, for _dynamic_ errors.
+//! So where you would write this with
 //! anyhow:
 //!
 //! ```rust
 //! use anyhow::Context;
 //!
 //! let opt: Option<()> = None;
-//! let result = opt.context("new error message");
+//! let result_static = opt.context("static error message");
+//! let result_dynamic = opt.with_context(|| format!("{} error message", "dynamic"));
 //! ```
 //!
 //! With `eyre` we want users to write:
 //!
 //! ```rust
-//! use eyre::{eyre, Result};
+//! use eyre::{eyre, OptionExt, Result};
 //!
 //! # #[cfg(not(feature = "auto-install"))]
 //! # eyre::set_hook(Box::new(eyre::DefaultHandler::default_with)).unwrap();
 //! #
 //! let opt: Option<()> = None;
-//! let result: Result<()> = opt.ok_or_else(|| eyre!("new error message"));
+//! let result_static: Result<()> = opt.ok_or_eyre("static error message");
+//! let result_dynamic: Result<()> = opt.ok_or_else(|| eyre!("{} error message", "dynamic"));
 //! ```
 //!
 //! **NOTE**: However, to help with porting we do provide a `ContextCompat` trait which
@@ -328,12 +318,15 @@
 //! [`simple-eyre`]: https://github.com/eyre-rs/simple-eyre
 //! [`color-spantrace`]: https://github.com/eyre-rs/color-spantrace
 //! [`color-backtrace`]: https://github.com/athre0z/color-backtrace
-#![doc(html_root_url = "https://docs.rs/eyre/0.6.8")]
+#![doc(html_root_url = "https://docs.rs/eyre/0.6.10")]
+#![cfg_attr(
+    nightly,
+    feature(rustdoc_missing_doc_code_examples),
+    warn(rustdoc::missing_doc_code_examples)
+)]
 #![warn(
     missing_debug_implementations,
     missing_docs,
-    // FIXME: this lint is currently nightly only
-    rustdoc::missing_doc_code_examples,
     unsafe_op_in_unsafe_fn,
     rust_2018_idioms,
     unreachable_pub,
@@ -345,7 +338,6 @@
     overflowing_literals,
     path_statements,
     patterns_in_fns_without_body,
-    private_in_public,
     unconditional_recursion,
     unused,
     unused_allocation,
@@ -371,12 +363,13 @@ mod error;
 mod fmt;
 mod kind;
 mod macros;
+mod option;
 mod ptr;
 mod wrapper;
 
 use crate::backtrace::Backtrace;
 use crate::error::ErrorImpl;
-use core::fmt::Display;
+use core::fmt::{Debug, Display};
 
 use std::error::Error as StdError;
 
@@ -721,7 +714,7 @@ pub trait EyreHandler: core::any::Any + Send + Sync {
             }
         }
 
-        Ok(())
+        Result::Ok(())
     }
 
     /// Store the location of the caller who constructed this error report
@@ -843,7 +836,7 @@ impl EyreHandler for DefaultHandler {
             }
         }
 
-        Ok(())
+        Result::Ok(())
     }
 
     #[cfg(track_caller)]
@@ -1096,6 +1089,13 @@ pub type Result<T, E = Report> = core::result::Result<T, E>;
 ///         # panic!("expected downcast to succeed");
 ///     }
 ///     ```
+///
+/// # `wrap_err` vs `wrap_err_with`
+///
+/// `wrap_err` incurs a runtime cost even in the non-error case because it requires eagerly
+/// constructing the error object. `wrap_err_with` avoids this cost through lazy evaluation. This
+/// cost is proportional to the cost of the currently installed [`EyreHandler`]'s creation step.
+/// `wrap_err` is useful in cases where an constructed error object already exists.
 pub trait WrapErr<T, E>: context::private::Sealed {
     /// Wrap the error value with a new adhoc error
     #[cfg_attr(track_caller, track_caller)]
@@ -1125,6 +1125,61 @@ pub trait WrapErr<T, E>: context::private::Sealed {
         F: FnOnce() -> D;
 }
 
+/// Provides the [`ok_or_eyre`][OptionExt::ok_or_eyre] method for [`Option`].
+///
+/// This trait is sealed and cannot be implemented for types outside of
+/// `eyre`.
+///
+/// # Example
+///
+/// ```
+/// # #[cfg(not(feature = "auto-install"))]
+/// # eyre::set_hook(Box::new(eyre::DefaultHandler::default_with)).unwrap();
+/// use eyre::OptionExt;
+///
+/// let option: Option<()> = None;
+///
+/// let result = option.ok_or_eyre("static str error");
+///
+/// assert_eq!(result.unwrap_err().to_string(), "static str error");
+/// ```
+///
+/// # `ok_or_eyre` vs `ok_or_else`
+///
+/// If string interpolation is required for the generated [report][Report],
+/// use [`ok_or_else`][Option::ok_or_else] instead,
+/// invoking [`eyre!`] to perform string interpolation:
+///
+/// ```
+/// # #[cfg(not(feature = "auto-install"))]
+/// # eyre::set_hook(Box::new(eyre::DefaultHandler::default_with)).unwrap();
+/// use eyre::eyre;
+///
+/// let option: Option<()> = None;
+///
+/// let result = option.ok_or_else(|| eyre!("{} error", "dynamic"));
+///
+/// assert_eq!(result.unwrap_err().to_string(), "dynamic error");
+/// ```
+///
+/// `ok_or_eyre` incurs no runtime cost, as the error object
+/// is constructed from the provided static argument
+/// only in the `None` case.
+pub trait OptionExt<T>: context::private::Sealed {
+    /// Transform the [`Option<T>`] into a [`Result<T, E>`],
+    /// mapping [`Some(v)`][Option::Some] to [`Ok(v)`][Result::Ok]
+    /// and [`None`] to [`Report`].
+    ///
+    /// `ok_or_eyre` allows for eyre [`Report`] error objects
+    /// to be lazily created from static messages in the `None` case.
+    ///
+    /// For dynamic error messages, use [`ok_or_else`][Option::ok_or_else],
+    /// invoking [`eyre!`] in the closure to perform string interpolation.
+    fn ok_or_eyre<M>(self, message: M) -> crate::Result<T>
+    where
+        M: Debug + Display + Send + Sync + 'static;
+}
+
 /// Provides the `context` method for `Option` when porting from `anyhow`
 ///
 /// This trait is sealed and cannot be implemented for types outside of
@@ -1198,6 +1253,29 @@ pub trait ContextCompat<T>: context::private::Sealed {
         F: FnOnce() -> D;
 }
 
+/// Equivalent to Ok::<_, eyre::Error>(value).
+///
+/// This simplifies creation of an eyre::Result in places where type inference
+/// cannot deduce the `E` type of the result &mdash; without needing to write
+/// `Ok::<_, eyre::Error>(value)`.
+///
+/// One might think that `eyre::Result::Ok(value)` would work in such cases
+/// but it does not.
+///
+/// ```console
+/// error[E0282]: type annotations needed for `std::result::Result<i32, E>`
+///   --> src/main.rs:11:13
+///    |
+/// 11 |     let _ = eyre::Result::Ok(1);
+///    |         -   ^^^^^^^^^^^^^^^^ cannot infer type for type parameter `E` declared on the enum `Result`
+///    |         |
+///    |         consider giving this pattern the explicit type `std::result::Result<i32, E>`, where the type parameter `E` is specified
+/// ```
+#[allow(non_snake_case)]
+pub fn Ok<T>(t: T) -> Result<T> {
+    Result::Ok(t)
+}
+
 // Not public API. Referenced by macro-generated code.
 #[doc(hidden)]
 pub mod private {
diff --git a/eyre/src/macros.rs b/eyre/src/macros.rs
index 792a646..4820b28 100644
--- a/eyre/src/macros.rs
+++ b/eyre/src/macros.rs
@@ -1,6 +1,6 @@
 /// Return early with an error.
 ///
-/// This macro is equivalent to `return Err(From::from($err))`.
+/// This macro is equivalent to `return Err(eyre!(<args>))`.
 ///
 /// # Example
 ///
@@ -51,22 +51,22 @@
 #[macro_export]
 macro_rules! bail {
     ($msg:literal $(,)?) => {
-        return $crate::private::Err($crate::eyre!($msg));
+        return $crate::private::Err($crate::eyre!($msg).into());
     };
     ($err:expr $(,)?) => {
-        return $crate::private::Err($crate::eyre!($err));
+        return $crate::private::Err($crate::eyre!($err).into());
     };
     ($fmt:expr, $($arg:tt)*) => {
-        return $crate::private::Err($crate::eyre!($fmt, $($arg)*));
+        return $crate::private::Err($crate::eyre!($fmt, $($arg)*).into());
     };
 }
 
 /// Return early with an error if a condition is not satisfied.
 ///
-/// This macro is equivalent to `if !$cond { return Err(From::from($err)); }`.
+/// This macro is equivalent to `if !$cond { return Err(eyre!(<other args>)); }`.
 ///
 /// Analogously to `assert!`, `ensure!` takes a condition and exits the function
-/// if the condition fails. Unlike `assert!`, `ensure!` returns an `Error`
+/// if the condition fails. Unlike `assert!`, `ensure!` returns an `eyre::Result`
 /// rather than panicking.
 ///
 /// # Example
@@ -107,26 +107,31 @@ macro_rules! bail {
 /// ```
 #[macro_export]
 macro_rules! ensure {
+    ($cond:expr $(,)?) => {
+        if !$cond {
+            $crate::ensure!($cond, concat!("Condition failed: `", stringify!($cond), "`"))
+        }
+    };
     ($cond:expr, $msg:literal $(,)?) => {
         if !$cond {
-            return $crate::private::Err($crate::eyre!($msg));
+            return $crate::private::Err($crate::eyre!($msg).into());
         }
     };
     ($cond:expr, $err:expr $(,)?) => {
         if !$cond {
-            return $crate::private::Err($crate::eyre!($err));
+            return $crate::private::Err($crate::eyre!($err).into());
         }
     };
     ($cond:expr, $fmt:expr, $($arg:tt)*) => {
         if !$cond {
-            return $crate::private::Err($crate::eyre!($fmt, $($arg)*));
+            return $crate::private::Err($crate::eyre!($fmt, $($arg)*).into());
         }
     };
 }
 
 /// Construct an ad-hoc error from a string.
 ///
-/// This evaluates to an `Error`. It can take either just a string, or a format
+/// This evaluates to a `Report`. It can take either just a string, or a format
 /// string with arguments. It also can take any custom type which implements
 /// `Debug` and `Display`.
 ///
diff --git a/eyre/src/option.rs b/eyre/src/option.rs
new file mode 100644
index 0000000..eaa1e84
--- /dev/null
+++ b/eyre/src/option.rs
@@ -0,0 +1,14 @@
+use crate::OptionExt;
+use core::fmt::{Debug, Display};
+
+impl<T> OptionExt<T> for Option<T> {
+    fn ok_or_eyre<M>(self, message: M) -> crate::Result<T>
+    where
+        M: Debug + Display + Send + Sync + 'static,
+    {
+        match self {
+            Some(ok) => Ok(ok),
+            None => Err(crate::Report::msg(message)),
+        }
+    }
+}
diff --git a/eyre/tests/test_macros.rs b/eyre/tests/test_macros.rs
index 2bcad38..9fddd8a 100644
--- a/eyre/tests/test_macros.rs
+++ b/eyre/tests/test_macros.rs
@@ -39,6 +39,34 @@ fn test_ensure() {
         Ok(())
     };
     assert!(f().is_err());
+
+    // Tests single-argument `ensure!`
+    let f = || -> Result<()> {
+        ensure!(v + v == 1);
+        Ok(())
+    };
+    assert_eq!(
+        f().unwrap_err().to_string(),
+        "Condition failed: `v + v == 1`",
+    );
+
+    // Tests automatically converting to external errors with ensure!()
+    let f = || -> Result<(), SomeWrappingErr> {
+        ensure!(false, "this will fail");
+        Ok(())
+    };
+    assert!(f().is_err());
+}
+
+#[allow(dead_code)]
+struct SomeWrappingErr {
+    err: eyre::Error,
+}
+
+impl From<eyre::Error> for SomeWrappingErr {
+    fn from(err: eyre::Error) -> Self {
+        SomeWrappingErr { err }
+    }
 }
 
 #[test]
diff --git a/eyre/tests/test_option.rs b/eyre/tests/test_option.rs
new file mode 100644
index 0000000..7c9349a
--- /dev/null
+++ b/eyre/tests/test_option.rs
@@ -0,0 +1,15 @@
+mod common;
+
+use self::common::maybe_install_handler;
+use eyre::OptionExt;
+
+#[test]
+fn test_option_ok_or_eyre() {
+    maybe_install_handler().unwrap();
+
+    let option: Option<()> = None;
+
+    let result = option.ok_or_eyre("static str error");
+
+    assert_eq!(result.unwrap_err().to_string(), "static str error");
+}
diff --git a/eyre/tests/test_pyo3.rs b/eyre/tests/test_pyo3.rs
index 0ad71af..e7f58c1 100644
--- a/eyre/tests/test_pyo3.rs
+++ b/eyre/tests/test_pyo3.rs
@@ -28,6 +28,6 @@ fn test_pyo3_exception_contents() {
     Python::with_gil(|py| {
         let locals = [("err", pyerr)].into_py_dict(py);
         let pyerr = py.run("raise err", None, Some(locals)).unwrap_err();
-        assert_eq!(pyerr.pvalue(py).to_string(), expected_contents);
+        assert_eq!(pyerr.value(py).to_string(), expected_contents);
     })
 }
diff --git a/eyre/tests/test_toolchain.rs b/eyre/tests/test_toolchain.rs
new file mode 100644
index 0000000..0309398
--- /dev/null
+++ b/eyre/tests/test_toolchain.rs
@@ -0,0 +1,34 @@
+// These tests check our build script against rustversion.
+
+#[rustversion::attr(not(nightly), ignore)]
+#[test]
+fn nightlytest() {
+    if !cfg!(nightly) {
+        panic!("nightly feature isn't set when the toolchain is nightly.");
+    }
+    if cfg!(any(beta, stable)) {
+        panic!("beta, stable, and nightly are mutually exclusive features.")
+    }
+}
+
+#[rustversion::attr(not(beta), ignore)]
+#[test]
+fn betatest() {
+    if !cfg!(beta) {
+        panic!("beta feature is not set when the toolchain is beta.");
+    }
+    if cfg!(any(nightly, stable)) {
+        panic!("beta, stable, and nightly are mutually exclusive features.")
+    }
+}
+
+#[rustversion::attr(not(stable), ignore)]
+#[test]
+fn stabletest() {
+    if !cfg!(stable) {
+        panic!("stable feature is not set when the toolchain is stable.");
+    }
+    if cfg!(any(nightly, beta)) {
+        panic!("beta, stable, and nightly are mutually exclusive features.")
+    }
+}