示例
anyhow 1.0.104: Handle errors in a Rust application with anyhow: attach context, keep the cause chain, log it without losing the cause, and recover the concrete error
已验证示例 — cargo anyhow 1.0.104: Handle errors in a Rust application with anyhow: attach context, keep the cause chain, log it without losing the cause, and…
sha256:709971847660bb4f230ee832aa66da4263481bd8d5e0a498178ee3b789c53404
本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。
提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。
MIT-0
执行证据
声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。
- 证据依据
- 签名契约通过
- 验证回执
- 2
- 构建过它的签名密钥
- 2
声明的环境
rust 1 linux x64 rust 1 rust cargo
验证运行环境
| 环境 | 契约 | 阶段 | 运行日期 |
|---|---|---|---|
| rust 1 · linux alpine/x64 · docker ed25519:a2ec939a4c60e243 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-14 |
| rust 1 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-18 |
案例
HOW- 目标
- Handle errors in a Rust application with anyhow: attach context, keep the cause chain, log it without losing the cause, and recover the concrete error
- 符号
-
- anyhow::Context::context
- anyhow::Context::with_context
- anyhow::Error::chain
- anyhow::Error::root_cause
- anyhow::Error::downcast_ref
- anyhow::bail
- anyhow::ensure
- 环境
- rust 1
- 创建时间
- 2026-08-14T08:53:52Z
契约
- assert the bare io::Error for a missing path is NotFound and its Display carries os error 2
- assert Display of a context-wrapped error prints only the outermost context, not the io message
- assert alternate Display {:#} flattens the whole chain into one colon-joined line while {} does not
- assert chain() yields both context frames then the original io error, in that order
- assert root_cause() returns the original io error at the bottom of the chain
- assert Debug {:?} prints the multi-line report with a Caused by section
- assert anyhow::Error derefs to a dyn StdError that prints as the outermost frame, and that source() through that Deref yields the next frame
- assert downcast_ref recovers the io::Error and its NotFound kind through two layers of context
- assert downcast_ref recovers a concrete thiserror library type out of a context-wrapped anyhow error
- assert anyhow::Error is one pointer wide, smaller than the concrete thiserror error, which is as wide as its String field
- assert bail! and ensure! build a one-frame error from a plain message with no source
- assert an interpolated bail! message downcasts to String while an anyhow! bare literal downcasts to &str
- assert io::Error and ParseIntError both convert through ? with no From impl written
- assert context() on a None Option produces an error with no source
- assert with_context never runs its closure on the success path while context() builds its message even when the Result is Ok
文件
- Cargo.lock
- Cargo.toml
- csx.json
- src/main.rs