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Document assignment expression as coercion site #1954

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I was recently confused as for why this is allowed in Rust

let mut a = &12;
let b = &&34;
a = b; 

as I couldn't find that documented anywhere.

I was told that assignment expressions are in fact coercion sites which explains the example above.

This PR documents assignment expressions as coercion sites in the reference.

@rustbot rustbot added the S-waiting-on-review Status: The marked PR is awaiting review from a maintainer label Aug 2, 2025
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