Sample
set 1.1.1: Prove that mutating a shared `Set` during active iteration is rejected, including repeated calls launched before the iterator finishes.
Verified sample for gem set 1.1.1: Prove that mutating a shared `Set` during active iteration is rejected, including repeated calls launched before the…
sha256:1a1097583f6c75ee4125a9ecc435d4ce7b216229f203a390b852c6aaa024b001
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
- 1
Declared environment
ruby linux x64 ruby ruby bundler
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| ruby 3 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1 |
2026-08-16 |
| ruby 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1 | SKIPPED | compile:SKIPPED · contract:SKIPPED · load:SKIPPED · resolve:FAIL CONTAINER_RUN · rubygems@1 |
2026-08-18 |
Case
HOW- Goal
- Prove that mutating a shared `Set` during active iteration is rejected, including repeated calls launched before the iterator finishes.
- Packages
- Symbols
-
- Set#add
- Environment
- ruby
- Created
- 2026-08-16T16:52:54Z
Contract
- Mutating the shared `Set` from another thread while `each` is running must raise `RuntimeError` with `can't add a new key into hash during iteration`.
- Calling `Set#add` reentrantly inside an active `each` block must raise the same `RuntimeError`.
- Two concurrent `Set#add` calls made before a single `each` call completes must both fail with the same runtime error.
Files
- Gemfile
- NOTES.md
- csx.json
- test/contract.rb