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Add size-parameter to unecessary_box_returns #10651

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merged 1 commit into from
Apr 19, 2023

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lukaslueg
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@lukaslueg lukaslueg commented Apr 16, 2023

Fixes #10641

This adds a configuration-knob to the unecessary_box_returns-lint which allows not linting a fn() -> Box<T> if T is "large". The default byte size above which we no longer lint is 128 bytes (due to #4652 (comment), also used in #9373). The overall rational is given in #10641.


changelog: Enhancement: [unnecessary_box_returns]: Added new lint configuration unnecessary-box-size to set the maximum size of T in Box<T> to be linted
#10651

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rustbot commented Apr 16, 2023

r? @xFrednet

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@rustbot rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties label Apr 16, 2023
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LGTM, tiny nit related to the lint documentation comment. It requires some specific syntax. :)

@@ -463,6 +463,10 @@ define_Conf! {
///
/// The maximum byte size a `Future` can have, before it triggers the `clippy::large_futures` lint
(future_size_threshold: u64 = 16 * 1024),
/// Lint: UNNECESSARY_BOX_RETURNS,
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Suggested change
/// Lint: UNNECESSARY_BOX_RETURNS,
/// Lint: UNNECESSARY_BOX_RETURNS.

This list requires a dot at the end, to be parsed correctly. Once you do this, you also have to run cargo collect-matadata to update the lint configuration list in our book.

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xFrednet commented Apr 19, 2023

Thank you! You can r=me (meaning commenting bors r=xFrednet with an @ in front) once you did the change :)

@bors delegate+

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bors commented Apr 19, 2023

✌️ @lukaslueg can now approve this pull request

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@bors r=xFrednet

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bors commented Apr 19, 2023

📌 Commit 4bc68f9 has been approved by xFrednet

It is now in the queue for this repository.

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bors commented Apr 19, 2023

⌛ Testing commit 4bc68f9 with merge 0c44586...

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bors commented Apr 19, 2023

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: xFrednet
Pushing 0c44586 to master...

@bors bors merged commit 0c44586 into rust-lang:master Apr 19, 2023
@lukaslueg lukaslueg deleted the issue10641 branch April 19, 2023 13:07
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unnecessary_box_returns don't lint on large objects
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