2d7f7ffba5
ScalarInt: size mismatches are a bug, do not delay the panic Cc [Zulip](https://rust-lang.zulipchat.com/#narrow/stream/146212-t-compiler.2Fconst-eval/topic/Why.20are.20ScalarInt.20to.20iN.2FuN.20methods.20fallible.3F) r? ``@oli-obk``
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