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11737: Emit `#[must_use]` in `Generate new` assist r=lnicola a=lnicola Closes #11736 11739: Insert #[must_use] in generate_getter r=lnicola a=Walther Inserts `#[must_use]` for the generated getter methods. From discussion in https://github.com/rust-analyzer/rust-analyzer/issues/11736 and https://github.com/rust-analyzer/rust-analyzer/pull/11738 Co-authored-by: Laurențiu Nicola <lnicola@dend.ro> Co-authored-by: Walther <veeti.haapsamo@gmail.com>