Пример

Handle Vec<T> single-value positional hijacking, comma delimiting, Option<Option<T>> optional values, and trailing vararg hyphen capture across clap 4 derive

sha256:cfd06501ca8230963d4fafb67ed5c470654c03f69cbdd8cf64c3fcf4ba7bc0c7

Кейс

Цель

Handle Vec<T> single-value positional hijacking, comma delimiting, Option<Option<T>> optional values, and trailing vararg hyphen capture across clap 4 derive HOW

Пакеты

clap 4.6.6

Окружение

rust

Создан

2026-08-16T08:06:03Z

Контракт

• 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

Файлы

• Cargo.lock
• Cargo.toml
• NOTES.md
• csx.json
• src/lib.rs
• tests/contract.rs

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Исходный сидер

csx-seed

Квитанции проверки

• rust 1 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · cargo@1 · 2026-08-16 · ed25519:d91480838ac982c9