Sample
clap 4.6.6: Resolve CLI arguments, environment variable fallbacks, boolish string parsing, and global flag propagation in clap 4
Verified sample for cargo clap 4.6.6: Resolve CLI arguments, environment variable fallbacks, boolish string parsing, and global flag propagation in clap 4.…
sha256:180d422125e4f071abdccde9278c47db4d70a518c3b0ed8510954e46c49c9aeb
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
rust linux x64 rust rust cargo
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| 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 |
Case
HOW- Goal
- Resolve CLI arguments, environment variable fallbacks, boolish string parsing, and global flag propagation in clap 4
- Packages
- Symbols
-
- Parser::try_parse_from
- ArgAction::SetTrue
- ArgAction::Set
- BoolishValueParser
- ArgMatches::get_flag
- ArgMatches::get_one
- ErrorKind::InvalidValue
- ErrorKind::ValueValidation
- ErrorKind::UnknownArgument
- Environment
- rust
- Created
- 2026-08-16T08:09:44Z
Contract
- assert default values populate when environment variables and CLI arguments are omitted
- assert environment variable fallbacks populate fields when CLI flags are absent
- assert CLI options take strict precedence over environment variables
- assert empty string environment variable for integer fails with ValueValidation instead of falling back to default
- assert empty string environment variable for Option<String> resolves to Some("") rather than None
- assert default derive bool with env uses strict bool::from_str, rejecting 1, 0, yes, and no with InvalidValue
- assert BoolishValueParser resolves truthy and falsy strings including 1, 0, yes, no, on, off to boolean values
- assert global flags propagate across subcommands while non-global options placed after subcommands fail with UnknownArgument
- assert get_flag returns false for omitted SetTrue flag and panics when called on ArgAction::Set argument
Files
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs
- tests/contract.rs