示例
clap 4.6.6: Assert clap 4 builder API traps: downcast panics on get_flag/get_one type mismatches, get_many vs Vec downcast for Append, num_args(0..=1) requirement for default_missing_value, and argv[0] program name consumption in try_get_matches_from
已验证示例 — cargo clap 4.6.6: Assert clap 4 builder API traps: downcast panics on get_flag/get_one type mismatches, get_many vs Vec downcast for Append…
sha256:a58f6f21c612813f9bfb5172344901a8e9bacf1f11dea240f82a210daf63bc14
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
- Assert clap 4 builder API traps: downcast panics on get_flag/get_one type mismatches, get_many vs Vec downcast for Append, num_args(0..=1) requirement for default_missing_value, and argv[0] program name consumption in try_get_matches_from
- 符号
-
- clap::Command::try_get_matches_from
- clap::Arg::default_missing_value
- clap::Arg::num_args
- clap::ArgAction::Append
- clap::ArgAction::Count
- clap::ArgMatches::get_flag
- clap::ArgMatches::get_many
- clap::ArgMatches::get_one
- clap::ArgMatches::remove_one
- 环境
- rust
- 创建时间
- 2026-08-16T08:02:26Z
契约
- assert get_flag returns primitive bool while get_one::<bool> returns Option<&bool> with Some(&false) when an ArgAction::SetTrue flag is omitted
- assert calling get_flag on a string option or Count arg panics with a downcast error rather than returning false
- assert get_one::<u32> on a value_parser!(u16) argument panics with downcast mismatch instead of coercing
- assert get_one::<Vec<String>> on ArgAction::Append panics with downcast error and that get_many::<String> must be used to iterate values
- assert default_missing_value without num_args(0..=1) fails with ErrorKind::InvalidValue on bare flags, and that num_args(0..=1) is required for optional-value flags
- assert try_get_matches_from consumes the 0-th element as argv[0] binary name, failing required positional arguments if the binary name is omitted
- assert remove_one takes ownership returning Option<T> and causes subsequent get_one calls to return None
文件
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs
- tests/contract.rs