![]() make UB during CTFE a hard error This is a next step for https://github.com/rust-lang/rust/issues/71800. `const_err` has been a future-incompatibility lint for 4 months now since https://github.com/rust-lang/rust/pull/80394 (and err-by-default for many years before that), so I think we could try making it a proper hard error at least in some situations. I didn't yet adjust the tests, since I first want to gauge the fall-out via crater. Cc `@rust-lang/wg-const-eval` |
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