Failing gracefully

It might be worth thinking about falling back to traditional loops if there are unrecognized expressions while issuing a warning about not optimizing instead of a hard error.

Feel free to close if this doesn't align with your goals: errors are fine too if the expectance is that `@avx` should fail if unable to optimize.

The issue names no files, tests, or entry points. Start by reviewing the 32-comment discussion and the current @avx behavior, then establish whether unrecognized expressions should warn and fall back or remain errors. Completion depends on an agreed direction and corresponding regression coverage.

Escrito por el modelo de indexación a partir del texto del issue.