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Add known problem for redundant_closure lint

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Documenting https://github.com/rust-lang-nursery/rust-clippy/issues/1439 until it gets fixed.
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Wim 2018-07-21 18:05:02 +02:00 committed by GitHub
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clippy_lints/src/eta_reduction.rs
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@ -15,7 +15,11 @@ pub struct EtaPass;
/// **Why is this bad?** Needlessly creating a closure adds code for no benefit
/// and gives the optimizer more work.
///
/// **Known problems:** None.
/// **Known problems:** If creating the closure inside the closure has a side-
/// effect then moving the closure creation out will change when that side-
/// effect runs.
/// See https://github.com/rust-lang-nursery/rust-clippy/issues/1439 for more
/// details.
///
/// **Example:**
/// ```rust