Suggest alternatives when trying to mutate a HashMap/BTreeMap via indexing
#100906
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… indexing The error can be quite confusing to newcomers.
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…avidtwco Suggest alternatives when trying to mutate a `HashMap`/`BTreeMap` via indexing The error can be quite confusing to newcomers. Fixes rust-lang#100873. I'm not so sure about the message, open to wording suggestions.
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…iaskrgr Rollup of 15 pull requests Successful merges: - rust-lang#99993 (linker: Update some outdated comments) - rust-lang#100220 (Properly forward `ByRefSized::fold` to the inner iterator) - rust-lang#100826 (sugg: take into count the debug formatting) - rust-lang#100855 (Extra documentation for new formatting feature) - rust-lang#100888 (Coherence negative impls implied bounds) - rust-lang#100901 (Make some methods private) - rust-lang#100906 (Suggest alternatives when trying to mutate a `HashMap`/`BTreeMap` via indexing) - rust-lang#100912 (Diagnose missing includes in run-make tests) - rust-lang#100919 (Use par_body_owners for liveness) - rust-lang#100922 (Rewrite error index generator to greatly reduce the size of the pages) - rust-lang#100926 (Update README.md) - rust-lang#100930 (Use `--userns=keep-id` when "docker" is really podman) - rust-lang#100938 (rustdoc: remove unused CSS rule) - rust-lang#100940 (Do not suggest adding a bound to a opaque type) - rust-lang#100945 (Add a missing test case for impl generic mismatch) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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| if self.infcx.tcx.is_diagnostic_item(sym::HashMap, did) | ||
| || self.infcx.tcx.is_diagnostic_item(sym::BTreeMap, did) | ||
| { | ||
| err.help(format!("to modify a `{ty}`, use `.get_mut()`, `.insert()` or the entry API")); |
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Huh, was entirely expecting #[rustc_on_unimplemented] to be used for this, is that not available here?
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Yeah, checked that, but it doesn't work for some reason. I guess this doesn't go through the usual infra for traits lookup.
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The error can be quite confusing to newcomers.
Fixes #100873.
I'm not so sure about the message, open to wording suggestions.