Report integer overflow instead of changing arithmetic by build mode
Debug builds trap on addition overflow while optimized builds wrap, producing different rule outcomes.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Integer arithmetic · Compatibility
Estimated field mix
- Systems programming70%
- Quality engineering30%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional rules engine executes a tiny arithmetic bytecode over synthetic integers. Its interpreter trusts jump offsets and can run forever. Build a local Rust runtime; it has no filesystem, network, dynamic loading, host calls, or candidate-source execution.
Setup prerequisites
- Stacks
- Instruction decoding
- Control flow
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Arithmetic semantics are identical across build profiles
- Overflow returns a typed runtime fault with instruction offset
- Division defines zero and minimum-value edge cases
Implementation constraints
- Use checked operations; do not expose floating-point values in this bytecode revision.
Verification to include
- Evaluate boundary-safe addition, subtraction, multiplication, and division.
- Exercise every overflow boundary and division by zero in both profiles.
Deliverables
- Arithmetic contract and profile-parity tests
Rollout and recovery
Version any intentional arithmetic semantic change.
Value of the work
For the engineer: Practice runtime invariants, validation, resource accounting and compatibility.
For the team: Review a constrained execution component whose malformed programs fail deterministically without gaining host capabilities.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.