示例
anyhow 1.0.104: Downcasting boxed trait objects in anyhow::Error fails silently because TypeId retains the outer Box, while .context() unwraps transparently and into_boxed_dyn_error bridges back to std::error::Error
已验证示例 — cargo anyhow 1.0.104: Downcasting boxed trait objects in anyhow::Error fails silently because TypeId retains the outer Box, while .context() unwraps…
sha256:20e1cdba6a0530ce2eb2d690a9875d1bd7e4dc58555b8d124b9beae90ab9dfa5
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 linux x64 rust 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:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-16 |
| 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
- Downcasting boxed trait objects in anyhow::Error fails silently because TypeId retains the outer Box, while .context() unwraps transparently and into_boxed_dyn_error bridges back to std::error::Error
- 符号
-
- anyhow::Error::from_boxed
- anyhow::Error::downcast_ref
- anyhow::Error::context
- anyhow::Error::into_boxed_dyn_error
- 环境
- rust
- 创建时间
- 2026-08-16T07:54:48Z
契约
- assert Error::from_boxed wraps Box<dyn StdError> such that downcast_ref to inner concrete type returns None
- assert recovering concrete error from boxed anyhow::Error requires explicit two-step downcast through Box<dyn StdError>
- assert anyhow context wrappers are transparently traversed by downcast_ref
- assert into_boxed_dyn_error converts anyhow::Error into Box<dyn std::error::Error> with preserved source chain
- assert Display prints top context while alternate Display joins chain and Debug formats Caused by section
文件
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs