Sample
thiserror 2.0.20: Unannotated cause fields silently sever Error::source(), #[error(transparent)] delegates rather than wrapping, and #[from] drops call-site context
Verified sample for cargo thiserror 2.0.20: Unannotated cause fields silently sever Error::source(), #[error(transparent)] delegates rather than wrapping…
sha256:b162c28cead8cd82c46ab9054fec2a264ef8c956fc40e9aa369447b786e5229c
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:ac1544ece1e22594 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-15 |
| 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
- Unannotated cause fields silently sever Error::source(), #[error(transparent)] delegates rather than wrapping, and #[from] drops call-site context
- Packages
- Symbols
-
- thiserror::Error
- std::error::Error::source
- std::convert::From
- Environment
- rust
- Created
- 2026-08-15T04:22:49Z
Contract
- assert struct field named cause returns None from source() unless explicitly annotated with #[source]
- assert struct field named source implicitly enables source() without #[source]
- assert #[error(transparent)] forwards source() to inner error rather than returning inner as wrapper source
- assert #[from] error conversion silently loses call-site contextual parameters
- assert outer error formatting with {0} causes duplicate messages when walking source chain
Files
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs