Sample
anyhow 1.0.104: RUST_LIB_BACKTRACE overrides RUST_BACKTRACE during eager anyhow backtrace capture, and Debug formatting appends stack traces only when Captured
Verified sample for cargo anyhow 1.0.104: RUST_LIB_BACKTRACE overrides RUST_BACKTRACE during eager anyhow backtrace capture, and Debug formatting appends…
sha256:0d060c885ab1406bc8e8bff006df2cbc2e81b0c74808b71073845ec073c38003
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
- RUST_LIB_BACKTRACE overrides RUST_BACKTRACE during eager anyhow backtrace capture, and Debug formatting appends stack traces only when Captured
- Packages
- Symbols
-
- anyhow::Error::backtrace
- std::backtrace::Backtrace::status
- std::backtrace::BacktraceStatus
- anyhow::bail
- anyhow::Context::context
- Environment
- rust
- Created
- 2026-08-16T07:54:49Z
Contract
- assert anyhow captures backtraces with status Captured when RUST_BACKTRACE is enabled
- assert anyhow backtrace status is Disabled when RUST_BACKTRACE is zero or unset
- assert RUST_LIB_BACKTRACE=0 overrides RUST_BACKTRACE=1 to disable anyhow backtrace capture
- assert RUST_LIB_BACKTRACE=1 overrides RUST_BACKTRACE=0 to enable anyhow backtrace capture
- assert anyhow backtrace capture is eager at instantiation time and does not capture retroactively when env changes
- assert Debug formatting appends Stack backtrace only when backtrace status is Captured
- assert Display and Alternate Display format error messages and chains without backtrace frames
- assert anyhow::Error::backtrace provides an inherent method returning a reference to std Backtrace
Files
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/bin/inspector.rs
- src/lib.rs
- tests/contract.rs