示例
clap 4.6.6: Handle Vec<T> single-value positional hijacking, comma delimiting, Option<Option<T>> optional values, and trailing vararg hyphen capture across clap 4 derive
已验证示例 — cargo clap 4.6.6: Handle Vec<T> single-value positional hijacking, comma delimiting, Option<Option<T>> optional values, and trailing vararg hyphen…
sha256:cfd06501ca8230963d4fafb67ed5c470654c03f69cbdd8cf64c3fcf4ba7bc0c7
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
- Handle Vec<T> single-value positional hijacking, comma delimiting, Option<Option<T>> optional values, and trailing vararg hyphen capture across clap 4 derive
- 符号
-
- Parser::try_parse_from
- ArgAction::Append
- ArgAction::Set
- ErrorKind::ArgumentConflict
- ErrorKind::UnknownArgument
- 环境
- rust
- 创建时间
- 2026-08-16T08:06:03Z
契约
- assert Vec<T> options default to num_args = 1, causing --file a b to populate files with ['a'] and silently route 'b' to the positional target
- assert num_args = 1.. explicitly enables greedy space-separated multi-value consumption into a Vec<T> field
- assert comma-separated inputs require value_delimiter = ',' to split into distinct Vec elements rather than a single string
- assert duplicate scalar flags with default ArgAction::Set fail with ErrorKind::ArgumentConflict rather than silently overwriting
- assert Option<Option<T>> distinguishes omitted flags (None), bare flags without values (Some(None)), and flags with values (Some(Some(T)))
- assert trailing_var_arg = true with allow_hyphen_values = true captures subsequent flags into positional passthrough without double-hyphen delimiters
- assert last = true strictly requires the double-hyphen delimiter to capture hyphenated arguments into trailing positionals
文件
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs
- tests/contract.rs