3 months ago
- A programmer discovered a compiler bug in Rust while refactoring a JavaScript engine's parser.
- The bug was in a function where using 'x as u32' for boolean addition caused incorrect behavior, but using an explicit if-else worked.
- Assembly inspection confirmed the compiler omitted an increment instruction, leading to a miscompilation.
- The issue was reported as 'Suspected miscompilation' and quickly fixed within 18 hours by the Rust community.
- The bug was classified as p-critical and i-miscompile, highlighting rare but serious compiler errors.