4bd40186db
explain how to turn integers into fn ptrs (with an intermediate raw ptr, not a direct transmute) Direct int2ptr transmute, under the semantics I am imagining, will produce a ptr with "invalid" provenance that is invalid to deref or call. We cannot give it the same semantics as int2ptr casts since those do [something complicated](https://www.ralfj.de/blog/2022/04/11/provenance-exposed.html). To my great surprise, that is already what the example in the `transmute` docs does. :) I still added a comment to say that that part is important, and I added a section explicitly talking about this to the `fn()` type docs. With https://github.com/rust-lang/miri/pull/2151, Miri will start complaining about direct int-to-fnptr transmutes (in the sense that it is UB to call the resulting pointer). |
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| benches | ||
| primitive_docs | ||
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| Cargo.toml | ||