815a07e667
don't remove `dbg!` in arbitrary expressions Fixes #9914 The `dbg_macro` lint replaces empty `dbg!` invocations with the empty string in its suggestion, which is not always valid code in certain contexts (e.g. `let _ = dbg!();` becomes `let _ = ;`). This PR changes it to `()`, which should always be valid where `dbg!()` is valid (`dbg!()` with no arguments evaluates to `()`). It also special-cases "standalone" `dbg!();` expression statements, where it will suggest removing the whole statement entirely like it did before. changelog: [`dbg_macro`]: don't remove `dbg!()` in arbitrary expressions as it sometimes results in syntax errors |
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