Improve error reporting for modifications behind & references
#86815
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Improve error reporting for modifications behind `&` references I had a look at rust-lang#84210 and noticed that rust-lang#85823 has effectively already fixed rust-lang#84210. However, the string matching in rust-lang#85823 is _very_ crude and already breaks down when a variable name starts with `mut`. I have made this a bit more robust; further improvements could definitely be made but are complicated by the lack of information provided by an earlier pass: https://github.com/rust-lang/rust/blob/ce331ee6ee010438d1a58c7da8ced4f26d69a20e/compiler/rustc_mir_build/src/build/matches/mod.rs#L2103-L2107 I have also fixed a missing comma in the error message.
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I had a look at #84210 and noticed that #85823 has effectively already fixed #84210.
However, the string matching in #85823 is very crude and already breaks down when a variable name starts with
mut. I have made this a bit more robust; further improvements could definitely be made but are complicated by the lack of information provided by an earlier pass:rust/compiler/rustc_mir_build/src/build/matches/mod.rs
Lines 2103 to 2107 in ce331ee
I have also fixed a missing comma in the error message.