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//! 1. 🐢 **Multi-threaded runtime**: Reduced throughput but still running
//! 2. 🧊 **Single-threaded runtime**: Total blockage - nothing else runs
Literary references with layered meaning:
//! What's in a name? 😛 The three core properties:
The 😛 is a visual pun on "tongue in cheek" - Shakespeare's Juliet argues names don't matter,
but here we use the quote to explain why RRT's name does matter. The emoji signals the irony.
Rule: Emoji must have semantic meaning (OS icons, severity levels). Never use random 🚀✨🎉 for "excitement."
Unicode Over Emoji in Diagrams
For ASCII art diagrams in rustdoc, use only glyphs listed in docs/boxes.md. That file is
the approved set - every glyph there has been tested across multiple fonts and terminals on
macOS, Linux, and Windows. Emoji and other Unicode characters outside that set may render
with incorrect widths or as tofu boxes.
Box-Drawing Characters
See docs/boxes.md for the complete approved set. Common patterns:
┌─────────────────────────────────────────────────────────────────────────┐
│ Box with header │
├─────────────────────────────────────────────────────────────────────────┤
│ Content here │
└─────────────────────────────────────────────────────────────────────────┘
Exception: OS-identifying emoji (🐧 🍎 🪟) are acceptable in prose because they're semantic
and commonly supported. But in ASCII art diagrams, stick to standard Unicode.
Prose Style
Doc comments should read naturally and have clear subjects. Avoid abrupt sentence starts.
Dashes, En Dashes & Em Dashes: Do Not Use to Connect Sentences
The ASCII hyphen / hyphen-minus (-, U+002D) is the ONLY dash character permitted anywhere in the codebase. Non-ASCII en dashes (–) and em dashes (—, endash/emdash) are strictly forbidden.
Do NOT use hyphens (-), en dashes (–), or em dashes (—) to connect clauses or sentences in documentation.
Connecting sentences or clauses with dashes, en dashes, or em dashes creates an awkward writing style.
Use separate sentences or standard punctuation (colons, semicolons, commas, or parentheses) instead.
Hyphens (-) should only be used for compound words (type-safe, zero-cost), markdown bullet points (- Item), or code/operators, never to join independent thoughts or clauses.
// ❌ Bad: Connecting sentences/clauses with dashes, en dashes, or em dashes
/// This is the main trait - implement it to add your logic.
/// This is the main trait – implement it to add your logic.
/// This is the main trait — implement it to add your logic.
// ✅ Good: Separate sentences or proper punctuation
/// This is the main trait. Implement it to add your logic.
/// This is the main trait: implement it to add your logic.
Technical Terminology Precision
Use precise terms for the code lifecycle and generics to maintain low cognitive load.
Declaration (Header) vs. Definition (Body) vs. Usage (Call Site).
In documentation prose, write escape sequences using human-readable ESC notation, not Rust
hex escape syntax.
\x1B is Rust/C escape syntax for byte 27. In prose, it forces the reader to mentally decode
hex before understanding the sequence.
ESC is the standard terminal notation used in VT-100 specs, Wikipedia, and terminal
documentation. A reader instantly knows "escape byte" without hex decoding.
Space-separate the components (ESC [ A, not ESC[A) so each part (escape prefix,
intermediary, final byte) is visually distinct.
// ❌ Bad: Rust escape syntax in documentation prose
/// Sends `\x1BOA` in application mode or `\x1B[A` in normal mode.
/// The detector scans for `\x1B[?1h` and `\x1B[?1l`.
// ✅ Good: Standard terminal notation
/// Sends `ESC O A` in application mode or `ESC [ A` in normal mode.
/// The detector scans for `ESC [ ? 1 h` and `ESC [ ? 1 l`.
Exception: In Rust code, doctests, and byte literals, continue using \x1B or 0x1B -
that's actual Rust syntax the compiler needs.
Acronym Formatting: Always Backtick
All technical acronyms get backticks. No exceptions - treat them as technical identifiers,
not prose.
// ❌ Bad: Plain text acronyms
/// Uses ANSI escape sequences to parse PTY output via the VTE parser.
// ✅ Good: All acronyms backticked
/// Uses `ANSI` escape sequences to parse `PTY` output via the `VTE` parser.
When Linking: Use [`ACRONYM`]
When a backticked acronym has a useful link target, wrap it in [] to create a
reference-style intra-doc link. Prefer local links when the target is a dependency
in Cargo.toml (validated at build time, works offline, version-matched). Fall back
to external URLs (Wikipedia, man pages) only when no local target exists:
/// Parses [`PTY`] output using the [`VTE`] parser over [`SSH`] connections.
///
/// [`PTY`]: https://en.wikipedia.org/wiki/Pseudoterminal // No local target
/// [`VTE`]: mod@vte // Local dep in Cargo.toml
/// [`SSH`]: https://en.wikipedia.org/wiki/Secure_Shell // No local target
When linking to an external project: [`GNOME VTE`]: https://gitlab.gnome.org/GNOME/vte
What Stays Plain Text
Standards body names and specification document identifiers stay as plain text - they are
citation references, not technical identifiers:
Category
Examples
Spec document identifiers
ECMA-48, ITU-T Rec. T.416, ISO 8613-6
When linking a spec, use descriptive link text: [ITU-T Rec. T.416]: https://...
DEC Private Modes
DEC private mode mnemonics are acronyms and get backticks: `DECAWM`,
`DECSC`, `DECRC`, `DECSM`.
When linking to a crate constant: [`DECAWM`]: crate::DECAWM_AUTO_WRAP
Opening Lines by Item Type
The first line/paragraph of a doc comment should describe what the item IS, not what it does.
Follow Rust std conventions.
IMPORTANT: The first paragraph must be separate. Rustdoc uses it as the summary in:
Module listings (each item shows only its first paragraph)
IDE tooltips and autocomplete
Search results
// ❌ Bad: Summary and details merged
/// A trait for creating workers. This trait implements two-phase setup.
// ✅ Good: Summary is separate paragraph
/// A trait for creating workers.
///
/// This trait implements two-phase setup.
Structs - Noun Phrase
Start with "A/An [noun]..." describing what it is:
// From std:
/// A contiguous growable array type, written as `Vec<T>`, short for 'vector'.
pub struct Vec<T> { ... }
/// A UTF-8-encoded, growable string.
pub struct String { ... }
/// A mutual exclusion primitive useful for protecting shared data.
pub struct Mutex<T> { ... }
// Our style:
/// A thread-safe container for managing worker thread lifecycle.
pub struct ThreadSafeGlobalState<F> { ... }
/// An offscreen buffer for testing terminal rendering.
pub struct OffscreenBuffer { ... }
Enums - What It Represents
Start with "A/An [noun]..." or "The [type]...":
// From std:
/// An `Ordering` is the result of a comparison between two values.
pub enum Ordering { Less, Equal, Greater }
/// An IP address, either IPv4 or IPv6.
pub enum IpAddr { V4(...), V6(...) }
// Our style:
/// An indication of whether the worker thread is running or terminated.
pub enum LivenessState { Running, Terminated }
/// A decision about whether the worker thread should shut down.
pub enum ShutdownDecision { ContinueRunning, ShutdownNow }
Traits - "A trait for..."
// Our style:
/// A trait for creating the coupled [`Worker`] + [`Waker`] pair atomically.
pub trait RRTFactory { ... }
/// A trait for implementing the blocking I/O loop on the dedicated RRT thread.
pub trait RRTWorker { ... }
Methods & Functions - Third-Person Verb
Start with what the method/function does using third-person:
// From std:
/// Constructs a new, empty `Vec<T>`.
pub fn new() -> Vec<T> { ... }
/// Returns the number of elements in the vector.
pub fn len(&self) -> usize { ... }
/// Appends an element to the back of a collection.
pub fn push(&mut self, value: T) { ... }
/// Returns the contained `Some` value, consuming the `self` value.
pub fn unwrap(self) -> T { ... }
// Our style:
/// Creates new thread state with fresh liveness tracking.
pub fn new(waker: W) -> Self { ... }
/// Checks if the thread should self-terminate.
pub fn should_self_terminate(&self) -> ShutdownDecision { ... }
Associated Types - "The type of..." or "The type..."
Follow the Rust std convention (e.g., Iterator::Item, Future::Output):
// From std:
/// The type of the elements being iterated over.
type Item;
/// The type of value produced on completion.
type Output;
// Our style (user-provided types use "Your type"):
/// The type broadcast from your [`Worker`] to async subscribers.
type Event;
/// Your type implementing one iteration of the blocking I/O loop.
type Worker: RRTWorker<Event = Self::Event>;
/// Your type for interrupting the blocked dedicated RRT worker thread.
type Waker: RRTWaker;
Pattern: Use "The type [verb]..." or "Your concrete type [verb]..." where the verb
describes what the type does:
"The concrete type broadcast..." (Event - gets broadcast)
"Your concrete type implementing..." (Worker - user provides this)
"Your concrete type for..." (Waker - user provides this)
When to use "Your concrete type": For associated types that the user must provide -
types with trait bounds like : RRTWorker. The word "concrete" emphasizes they provide
an actual struct/enum, not just satisfy an abstract contract.
When to use "of": Only when describing what a type contains rather than what it is:
std's Iterator::Item: "The type of the elements..." - Item contains elements
std's Future::Output: "The type of value..." - Output contains a value
Parenthetical clarifiers: When context is needed, use parentheticals:
/// Your concrete type (that implements this method) is an injected dependency...
Gold standard: See RRTFactory in tui/src/core/resilient_reactor_thread/types.rs
for a complete example of complex trait documentation with associated types.
Constants - Noun Phrase
/// Capacity of the broadcast channel for events.
pub const CHANNEL_CAPACITY: usize = 4_096;
/// ESC byte (1B in hex).
pub const ANSI_ESC: u8 = 27;
Note: All ANSI constants in tui/src/core/ansi/constants/ MUST follow the
Standardized Doc Template. See [constant-conventions.md] for details.
Quick Reference Table
Item Type
Pattern
Example Opening
Struct
A/An [noun]...
A thread-safe container for...
Enum
A/An [noun]...
An indication of whether...
Trait
A trait for...
A trait for creating...
Associated Type (user-provided)
Your concrete type [verb]...
Your concrete type implementing...
Associated Type (framework)
The concrete type [verb]...
The concrete type broadcast...
Method
Third-person verb
Returns the..., Creates a...
Function
Third-person verb
Constructs a new..., Checks if...
Constant
Noun phrase
Capacity of the..., ESC byte...
Module-Level Docs for Single-Type Files
When a file contains primarily one struct, enum, or trait, keep module docs minimal - just
identify the file's purpose and link to the main type:
Single Type - Link to It
//! Thread-safe global state manager for the Resilient Reactor Thread pattern. See
//! [`ThreadSafeGlobalState`] for details.
Dedicated Test Files (PTY Tests)
For files dedicated to a single PTY integration test, use module-level documentation
to describe the test's intent and provide execution instructions. This keeps the
generate_pty_test! macro call clean.
Standard Pattern:
Summary: What the test validates.
Detailed Description/Protocol: Explaining the test logic and ANSI sequences.
Run with section: MUST be the last paragraph before link definitions,
using an H1 header (# Run with:).
//! [`PTY`]-based integration test for [Feature Name].
//!
//! Validates that [specific behavior] works correctly in a real terminal environment.
//!
//! [Detailed description...]
//!
//! # Run with:
//!
//! ```bash
//! cargo test -p r3bl_tui --lib [test_name] -- --nocapture
//! ```
//!
//! [`PTY`]: https://en.wikipedia.org/wiki/Pseudoterminal
Why this matters:
Immediately actionable: "Run with" instructions are at the top of the file.
Clean implementation: Documentation is separated from the macro configuration.
Docs.rs discovery: Module-level docs are the first thing users see when clicking
the module on docs.rs.
Multiple Types - Bullet List
When a file contains multiple related types, use a brief intro + bullet list:
//! Core traits for the Resilient Reactor Thread (RRT) pattern.
//!
//! - [`RRTFactory`]: Creates coupled worker thread + waker
//! - [`RRTWorker`]: Work loop running on the thread
//! - [`RRTWaker`]: Interrupt a blocked thread
//!
//! See [module docs] for the full RRT pattern explanation.
//!
//! [module docs]: super
//! Thread liveness tracking for the Resilient Reactor Thread pattern. See
//! [`ThreadLiveness`], [`LivenessState`], and [`ShutdownDecision`].
Why minimal? The detailed documentation belongs on the types themselves (inverted pyramid).
Module docs just help readers navigate to the right type. Don't duplicate content.
Follow-Up Sentences Need Explicit Subjects
After the opening line, subsequent sentences should use explicit subjects - don't start with
verbs that leave the subject ambiguous:
❌ Bad: Abrupt Starts
/// A trait for interrupting blocked threads.
///
/// Called by `SubscriberGuard::drop()` to signal shutdown.
What's "called"? The trait? A method? The reader must guess.
✅ Good: Explicit Subjects
/// A trait for interrupting blocked threads.
///
/// [`SubscriberGuard::drop()`] calls [`wake_and_unblock_dedicated_thread()`] on implementors of this trait to signal
/// shutdown.
Now it's clear: the method is what's being called, on implementors of the trait.
Note: Traits themselves aren't "called" - methods are. Say what valid actions
a trait can take: "This trait solves...", "This trait requires...",
"This trait defines...". Don't say "This trait is called...".
Common Patterns to Fix
Abrupt Start
Fix With Explicit Subject
Called by...
[Foo::bar()] calls this method... or This method is called by...
Returned by...
This enum is returned by...
Used to...
This struct is used to...
Manages...
This struct manages...
Centralizes...
This module centralizes...
Solves...
This trait solves...
Method Doc Verb Tense
Methods should use third-person verbs (like Rust std docs), not imperative:
❌ Imperative
✅ Third-Person
Create a new buffer.
Creates a new buffer.
Return the length.
Returns the length.
Check if empty.
Checks if empty.
Subscribe to events.
Subscribes to events.
Why third-person? It reads naturally as "This method creates..." without needing to say
"This method". Imperative form ("Create...") sounds like a command to the reader.
Self-Reference in Different Contexts
Context
Self-Reference
Trait doc
This trait...
Struct doc
This struct...
Enum doc
This enum...
Module doc (//!)
This module...
Method doc
Implicit (verb alone) or This method...
Associated type doc
This type...
Section Headings for Reference Implementations
Use # Example (not # Concrete Implementation) when linking to reference implementations:
// ❌ Bad: Sounds like THE canonical implementation
/// # Concrete Implementation
///
/// See [`MioPollWorker`] for a concrete implementation.
// ✅ Good: Idiomatic Rust, implies there could be others
/// # Example
///
/// See [`MioPollWorker`] for an example implementation.
Why # Example?
Matches Rust std lib conventions
"example implementation" signals "one of potentially many"
"concrete implementation" sounds like THE canonical choice
Part 1: Structure (Inverted Pyramid)
Heading Levels and Sidebar Navigation
The cargo doc static site only shows # (h1) and ## (h2) headings in the sidebar
navigation. ### (h3) and below are not shown in the sidebar.
For sub-sections within a ## heading, use bold text (**bold**) instead of ###:
//! ## How It Works // ← Shown in sidebar
//!
//! **Creation and reuse** - ... // ← NOT in sidebar, but visually distinct
//!
//! **Cooperative shutdown** - ... // ← NOT in sidebar, but visually distinct
Why this matters: Using ### creates a false promise of navigability - readers expect
to find it in the sidebar but can't. Bold text is visually similar but sets correct
expectations.
Inverted Pyramid
Structure documentation with high-level concepts at the top, details below:
/// See the [module-level documentation] for complete usage examples.
///
/// [module-level documentation]: mod@crate::example
pub fn some_method(&self) -> Result<()> { /* ... */ }
Part 2: Intra-doc Links
Golden Rules
Use crate:: paths (not super::) - absolute paths are stable
Use reference-style links - keep prose clean
Place all link definitions at bottom of comment block
Include () for functions/methods - distinguishes from types
Link Source Priority
When deciding local vs external links, follow this priority:
Priority
Source
Link Style
Example
1
Code in this monorepo
crate:: path
[Foo]: crate::module::Foo
2
Dependency in Cargo.toml
Crate path
[mio]: mio
3
OS/CS/hardware terms
External URL
[epoll]: https://man7.org/...
4
Pedagogical/domain terms
Wikipedia URL
[design pattern]: https://en.wikipedia.org/...
5
Non-dependency crates
docs.rs URL
[rayon]: https://docs.rs/rayon
Key principle: If it's in Cargo.toml, use local links (validated, offline-capable, version-matched).
Link All Symbols for Refactoring Safety
Every codebase symbol in backticks must be a link. This isn't just style -it's safety.
When you rename, move, or delete a symbol:
With links: cargo doc fails with a clear error pointing to the stale reference
Without links: The docs silently rot, referencing symbols that no longer exist
Docs say
Symbol renamed to
With link
Without link
[`Parser`]
Tokenizer
❌ Build error
✅ Silently stale
[`process()`]
handle()
❌ Build error
✅ Silently stale
Rule: If it's a symbol from your codebase and it's in backticks, make it a link.
// ❌ Bad: Will silently rot when Parser is renamed
/// Uses `Parser` for tokenization.
// ✅ Good: cargo doc will catch if Parser is renamed
/// Uses [`Parser`] for tokenization.
///
/// [`Parser`]: crate::Parser
Quick Reference
Link To
Pattern
Struct
[Foo]: crate::Foo
Function
[process()]: crate::process
Method
[run()]: Self::run
Module
[parser]: mod@crate::parser
Section heading
[docs]: mod@crate::module#section-name
Dependency crate
[tokio::spawn()]: tokio::spawn
✅ Good: Reference-Style Links
/// This struct uses [`Position`] to track cursor location.
///
/// The [`render()`] method updates the display.
///
/// [`Position`]: crate::Position
/// [`render()`]: Self::render
❌ Bad: Inline Links
/// This struct uses [`Position`](crate::Position) to track cursor location.
❌ Bad: No Links
/// This struct uses `Position` to track cursor location.
Linking to Dependency Crates
For crates listed in your Cargo.toml dependencies, use direct intra-doc links instead of
external hyperlinks to docs.rs. Rustdoc automatically resolves these when the dependency is built.
Link To
Pattern
Crate root
[crossterm]: ::crossterm
Type in crate
[mio::Poll]: mio::Poll
Function in crate
[tokio::io::stdin()]: tokio::io::stdin
Macro in crate
[tokio::select!]: tokio::select
✅ Good: Direct Dependency Links
//! **UI freezes** on terminal resize when using [`tokio::io::stdin()`].
//! Internally, cancelling a [`tokio::select!`] branch doesn't stop the read.
//! However, the use of [Tokio's stdin] caused the first two issues.
//!
//! [`tokio::select!`]: tokio::select
//! [`tokio::io::stdin()`]: tokio::io::stdin
//! [Tokio's stdin]: tokio::io::stdin
/// Uses [`mio::Poll`] to efficiently wait on file descriptor events.
///
/// [`mio::Poll`]: mio::Poll
//! Use [`crossterm`]'s `enable_raw_mode` for terminal input.
//!
//! [`crossterm`]: ::crossterm
❌ Bad: External docs.rs Links for Dependencies
/// Uses [mio::Poll](https://docs.rs/mio/latest/mio/struct.Poll.html) to wait.
Don't use docs.rs URLs for crates that are already in your Cargo.toml.
Why direct links are better for dependencies:
Clickable in local cargo doc output (works offline)
Version-matched to your actual dependency version
Validated by rustdoc (broken links caught at build time)
Consistent style with internal crate links
✅ OK: External docs.rs Links for Non-Dependencies
For crates that are not in your Cargo.toml, external links are fine:
/// This is similar to how [rayon](https://docs.rs/rayon) handles parallel iteration.
Since rayon isn't a dependency, there's no local documentation to link to.
✅ OK: External Links for OS/CS/Hardware Terminology
For operating system concepts, computer science terminology, or hardware references that aren't Rust crates,
use external URLs (man pages, Wikipedia, specs):
//! Uses [`epoll`] for efficient I/O multiplexing on Linux.
//! Implements the [`Actor`] pattern for message passing.
//! Reads from [`stdin`] which is a [`file descriptor`].
//!
//! [`epoll`]: https://man7.org/linux/man-pages/man7/epoll.7.html
//! [`Actor`]: https://en.wikipedia.org/wiki/Actor_model
//! [`stdin`]: std::io::stdin
//! [`file descriptor`]: https://en.wikipedia.org/wiki/File_descriptor
Common external link targets:
Type
URL Pattern
Example
Linux syscalls/APIs
man7.org/linux/man-pages/
epoll, signalfd, io_uring
BSD APIs
man.freebsd.org/
kqueue
CS concepts
en.wikipedia.org/wiki/
Actor model, Reactor pattern
Pedagogical terms
en.wikipedia.org/wiki/
design pattern, RAII, file descriptor
Specs/RFCs
Official spec sites
ANSI escape codes, UTF-8
Key distinction:
mio (Rust crate in Cargo.toml) → [mio]: mio (local)
Link domain-specific terminology to external references (typically Wikipedia) even when the
concept seems "obvious." This makes documentation accessible to readers of all backgrounds -
not everyone comes from a CS degree or has the same experience level.
Rule: If a term has a formal definition that would help a newcomer understand the docs,
link it. The cost of an extra link is near zero; the cost of excluding a reader is high.
// ✅ Good: Links pedagogical terms for inclusivity
//! This [design pattern] avoids all of this and allows async code to...
//! Resources are cleaned up via [`RAII`] when the guard is dropped.
//!
//! [design pattern]: https://en.wikipedia.org/wiki/Software_design_pattern
//! [`RAII`]: https://en.wikipedia.org/wiki/Resource_acquisition_is_initialization
// ❌ Bad: Assumes reader already knows these terms
//! This design pattern avoids all of this and allows async code to...
//! Resources are cleaned up via RAII when the guard is dropped.
Note: The link source priority is also documented in link-patterns.md. This redundancy is
intentional -SKILL.md content is loaded when the skill triggers, ensuring reliable application
during doc generation. Supporting files require explicit reads and serve as detailed reference.
Part 3: Constant Conventions
Use human-readable numeric literals for byte constants:
Type
Format
Example
Bitmasks (used in &, |, ^)
Binary
0b0110_0000
Printable ASCII
Byte literal
b'['
Non-printable bytes
Decimal
27
Comments
Show hex
// (1B in hex)
✅ Good: Human-Readable
/// ESC byte (1B in hex).
pub const ANSI_ESC: u8 = 27;
/// CSI bracket byte: `[` (91 decimal, 5B hex).
pub const ANSI_CSI_BRACKET: u8 = b'[';
/// Mask to convert control character to lowercase (60 in hex).
pub const CTRL_TO_LOWERCASE_MASK: u8 = 0b0110_0000;
For detailed conventions, see constant-conventions.md in this skill.
Part 4: Formatting
Run cargo rustdoc-fmt
# Format specific file
cargo rustdoc-fmt path/to/file.rs
# Format all git-changed files
cargo rustdoc-fmt
# Format entire workspace
cargo rustdoc-fmt --workspace
What it does:
Formats markdown tables with proper column alignment
Converts inline links to reference-style
Preserves code examples
If not installed:
cd build-infra && cargo install --path . --force
Markdown Table Alignment
Always use left-aligned columns in markdown tables. This is the default and most readable
alignment for technical documentation.
Alignment Syntax
| Left-aligned | Left-aligned | Left-aligned |
| :----------- | :----------- | :----------- |
| data | data | data |
The : on the left side of the dashes indicates left alignment. While the : is optional for
left alignment (it's the default), always include it explicitly for consistency.
Center (:---:) and right (---:) alignment are harder to scan and rarely appropriate for
technical docs. Use them only when the content semantically requires it (e.g., numeric columns
that should right-align for decimal alignment).
Why Left-Align?
Scannability - Eyes naturally start at the left margin
Consistency - All tables look the same throughout the codebase
Code snippets - Backtick content is easier to read left-aligned
No $ or LaTeX Math Delimiters
Do NOT use $ or $$ or \(...\) LaTeX math delimiters in rustdoc comments or chat responses. They do not render in the user's UI or standard markdown viewers. Use standard Markdown text, backticks (e.g., [start, start+len)), or code blocks instead.
Verify Documentation Builds
./check.fish --quick-doc
# (runs: cargo doc --no-deps, directly to serving dir - fastest for iteration)
# Use --doc for final verification before commits (includes staging/sync)
./check.fish --test
# (runs: cargo test --doc)
Code Examples in Docs
Golden Rule: Don't use ignore unless absolutely necessary.
Scenario
Use
Example compiles and runs
``` (default)
Compiles but shouldn't run
```no_run
Can't make it compile
Link to real code instead
Macro syntax
```ignore with HTML comment explaining why
Linking to Test Modules and Functions
/// See [`test_example`] for actual usage.
///
/// [`test_example`]: crate::tests::test_example
Make test module visible to docs:
#[cfg(any(test, doc))]
pub mod tests;
Platform-Specific Test Modules
When you see this warning:
"unresolved link to crate::path::test_module"
And the module is #[cfg(test)] only
Don't give up on links - Add conditional visibility instead of using plain text:
// Before (links won't resolve):
#[cfg(test)]
mod backend_tests;
// After (links resolve in docs):
#[cfg(any(test, doc))]
pub mod backend_tests;
Cross-Platform Docs for Platform-Specific Code
For code that only runs on specific platforms (e.g., Linux) but should have docs generated on all
platforms (so developers on macOS can read them locally):
// ❌ Broken: Docs won't generate on macOS!
#[cfg(all(target_os = "linux", any(test, doc)))]
pub mod linux_only_module;
// ✅ Fixed: Docs generate on all platforms, tests run only on Linux
#[cfg(any(doc, all(target_os = "linux", test)))]
pub mod linux_only_module;
#[cfg(all(target_os = "linux", not(any(test, doc))))]
mod linux_only_module;
// Re-exports also need the doc condition
#[cfg(any(target_os = "linux", doc))]
pub use linux_only_module::*;
Key insight: The doc cfg flag doesn't override other conditions -it's just another flag. Use
any(doc, ...) to make documentation an alternative path, not an additional requirement:
Pattern
Meaning
Docs on macOS?
all(target_os = "linux", any(test, doc))
Linux AND (test OR doc)
❌ No
any(doc, all(target_os = "linux", test))
doc OR (Linux AND test)
✅ Yes
Apply at all levels - If linking to a nested module, both parent and child modules need
the visibility change. See organize-modules skill for complete patterns and examples.
⚠️ Unix Dependency Caveat
The cfg(any(doc, ...)) pattern assumes the module's code compiles on all platforms. When
the module uses Unix-only APIs (e.g., mio::unix::SourceFd, signal_hook, std::os::fd::AsRawFd),
use cfg(any(all(unix, doc), ...)) instead to restrict doc builds to Unix platforms where the
dependencies exist.
Three-tier platform hierarchy for cfg doc patterns:
// Module uses mio::unix::SourceFd, signal_hook - Unix-only APIs.
// Dependencies in Cargo.toml are gated with cfg(unix).
// Doc builds are restricted to Unix where the dependencies exist.
#[cfg(any(all(unix, doc), all(target_os = "linux", test)))]
pub mod input;
#[cfg(all(target_os = "linux", not(any(test, doc))))]
mod input;
// Re-export also needs the unix-gated doc condition
#[cfg(any(target_os = "linux", all(unix, doc)))]
pub use input::*;
Rule of thumb: Match your doc cfg guard to your dependency's cfg guard. If the dep uses
cfg(unix), gate docs with all(unix, doc). If the dep uses cfg(target_os = "linux"), gate
docs with all(target_os = "linux", doc).
Checklist
Before committing documentation:
Opening lines describe what the item IS (traits: "A trait for...", structs: "A/An X that...")
First paragraph is separate (used as summary in module listings, IDE tooltips, search)
Follow-up sentences use explicit subjects ("This trait...", "This struct...")
Methods use third-person verbs (Creates, Returns, Checks - not Create, Return, Check)
