Announcing Rust 1.61.0

• rust

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In general I agree with this but that is not the reason there are two separate functions here. The discussions here and here seem to have come to the conclusion that retain_mut is being added as a backwards compatible fix for retain.

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Anybody knows when cargo-add will be distributed in stable cargo? Seems merged already.

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• rfcs

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This is one of the eventual goals of the unstable provide_any feature, which will allow (among other things) adding additional optional APIs to dyn Error. See also the related RFC 2895, the author of which notes explicitly:

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From https://github.com/rust-lang/compiler-team/issues/493

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  Forum for discussion about what unsafe code can and can't do

  

// SAFETY: The `add` here is safe, because: // // - Both pointers are part of the same object, as pointing directly // past the object also counts. // // - The size of the slice is never larger than isize::MAX bytes, as // noted here: // - https://github.com/rust-lang/unsafe-code-guidelines/issues/102#issuecomment-473340447 // - https://doc.rust-lang.org/reference/behavior-considered-undefined.html // - https://doc.rust-lang.org/core/slice/fn.from_raw_parts.html#safety // (This doesn't seem normative yet, but the very same assumption is // made in many places, including the Index implementation of slices.) // // - There is no wrapping around involved, as slices do not wrap past // the end of the address space.

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