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The algorithm for the compiler to crunch through reborrowed vs copied fields is not too bad, but it's still a bit involved and if it were to be reproduced at each reborrowing coercion site then the performance penalty would probably be significant
from the top result below
https://internals.rust-lang.org/t/pre-rfc-reborrow-trait/22972
Reborrowing happens implicitly at each coercion-site
https://internals.rust-lang.org/t/alloc-only-hashmap/24071
- libs - Rust Internals
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`alloc`-only `HashMap`
https://internals.rust-lang.org/t/there-should-be-a-primitive-int-float-trait-in-core-stdlib/24464
com/rust-lang/rfcs/pull/3686 which I like because it'll let you do impl<const N: u32> MyTrait for u<N>
https://internals.rust-lang.org/t/feat-doctest-off-for-forward-comment-scenario/24503
[feat] `#[doctest(off)]` for forward comment scenario - language design - Rust Internals
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[feat] `#[doctest(off
https://internals.rust-lang.org/t/const-first-functions/24466
Pull Request #148820 · rust-lang/rust · GitHub
What I often want though is something I would call const-first function
https://internals.rust-lang.org/t/rust-analyzer-crash-request-handler-panicked-0-u8/24494
Rust-analyzer crash : request handler panicked: `&'^0 [u8] - tools and infrastructure - Rust Internals
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Rust
https://internals.rust-lang.org/t/traits-for-function-items/22815
I recently can into a case like this while helping a colleague with implementing Rust wrappers around a Linux kernel module called debugfs