Sample
serde 1.0.229: Deserializing JSON strings into borrowed &'a str fails at runtime on any escape sequence, requiring Cow<'a, str> with #[serde(borrow)] to achieve zero-copy deserialization that safely falls back to allocation for escaped characters
Verified sample for cargo serde 1.0.229: Deserializing JSON strings into borrowed &'a str fails at runtime on any escape sequence, requiring Cow<'a, str>…
sha256:09e96f8c79cbf50ce6b866bd22ff765f17ef8c35bc22f9e6dc03f4b9e59507db
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
- Deserializing JSON strings into borrowed &'a str fails at runtime on any escape sequence, requiring Cow<'a, str> with #[serde(borrow)] to achieve zero-copy deserialization that safely falls back to allocation for escaped characters
- Packages
- Symbols
-
- serde_json::from_str
- serde_json::from_slice
- Environment
- rust
- Created
- 2026-08-16T06:28:08Z
Contract
- assert serde_json from_str borrows unescaped JSON string fields directly into &'a str with zero allocation
- assert serde_json from_str rejects &'a str deserialization on escape sequences like \n, \", \t, and \uXXXX with invalid type error
- assert serde_json from_str with #[serde(borrow)] Cow<'a, str> borrows unescaped strings as Cow::Borrowed and decodes escaped strings into Cow::Owned
- assert serde_json from_str with unannotated Cow<'a, str> defaults to DeserializeOwned and unconditionally allocates Cow::Owned
- assert serde_json from_slice matches from_str zero-copy borrowing behavior for &'a str and Cow<'a, str>
Files
- .gitignore
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs