Use `mem::take` instead of `mem::replace` when applicable #4881

krishna-veerareddy · 2019-12-04T21:22:49Z

std::mem::take can be used to replace a value of type T with T::default() instead of std::mem::replace.

Fixes issue #4871

changelog: Added lint for [mem_replace_with_default]

tests/ui/mem_replace.rs

krishna-veerareddy · 2019-12-09T01:51:17Z

@lzutao Hey I added checks so that it doesn't lint within macros. Also added some macro test cases to prevent regressions in the future.

clippy_lints/src/mem_replace.rs

bors · 2019-12-21T19:59:43Z

☔ The latest upstream changes (presumably #4932) made this pull request unmergeable. Please resolve the merge conflicts.

flip1995

LGTM! Linting in internal macros would be good though. On how to test this see my comment #4881 (comment)

clippy_lints/src/mem_replace.rs

flip1995 · 2019-12-22T10:18:15Z

And sorry for the late reply, I was on vacation.

clippy_lints/src/mem_replace.rs

tesuji · 2019-12-22T17:41:45Z

If you change

-            if func_args.len() == 2;
+            if let [dest, src] = &**func_args;

tests/ui/mem_replace_macro.rs

flip1995 · 2019-12-28T11:57:47Z

@bors r+

Thanks!

bors · 2019-12-28T11:57:48Z

📌 Commit aca6815 has been approved by flip1995

bors · 2019-12-28T11:57:55Z

⌛ Testing commit aca6815 with merge 31eb751...

…lip1995 Use `mem::take` instead of `mem::replace` when applicable `std::mem::take` can be used to replace a value of type `T` with `T::default()` instead of `std::mem::replace`. Fixes issue #4871 changelog: Added lint for [`mem_replace_with_default`]

bors · 2019-12-28T12:12:21Z

💔 Test failed - checks-travis

flip1995 · 2019-12-28T12:13:03Z

Expr -> Expr<'_>

krishna-veerareddy · 2019-12-29T17:01:40Z

@bors retry

bors · 2019-12-29T17:01:41Z

@krishna-veerareddy: 🔑 Insufficient privileges: not in try users

krishna-veerareddy · 2019-12-29T17:03:31Z

@flip1995 Hey I added the rustup fixes. Please review.

flip1995 · 2019-12-30T00:45:55Z

@bors r+

Thanks!

bors · 2019-12-30T00:45:56Z

📌 Commit 45e7b87 has been approved by flip1995

bors · 2019-12-30T00:46:04Z

⌛ Testing commit 45e7b87 with merge 0950766...

…lip1995 Use `mem::take` instead of `mem::replace` when applicable `std::mem::take` can be used to replace a value of type `T` with `T::default()` instead of `std::mem::replace`. Fixes issue #4871 changelog: Added lint for [`mem_replace_with_default`]

bors · 2019-12-30T00:50:15Z

💔 Test failed - status-appveyor

krishna-veerareddy · 2019-12-30T14:34:01Z

@flip1995 @phansch Hey there was another rustup fix required so rebased again.

`std::mem::take` can be used to replace a value of type `T` with `T::default()` instead of `std::mem::replace`.

Also added test cases for internal and external macros.

krishna-veerareddy · 2019-12-31T17:40:09Z

@phansch @flip1995 Rebased after rustup. Please review when you have some time. Thanks!

phansch · 2020-01-04T07:45:08Z

@bors r=flip1995

bors · 2020-01-04T07:45:09Z

📌 Commit 42e4595 has been approved by flip1995

bors · 2020-01-04T08:09:48Z

⌛ Testing commit 42e4595 with merge fa9b85d...

…lip1995 Use `mem::take` instead of `mem::replace` when applicable `std::mem::take` can be used to replace a value of type `T` with `T::default()` instead of `std::mem::replace`. Fixes issue #4871 changelog: Added lint for [`mem_replace_with_default`]

bors · 2020-01-04T08:39:54Z

☀️ Test successful - checks-travis, status-appveyor
Approved by: flip1995
Pushing fa9b85d to master...

krishna-veerareddy changed the title ~~Use mem::take instead of mem::replace when applicable~~ [WIP] Use mem::take instead of mem::replace when applicable Dec 4, 2019

krishna-veerareddy force-pushed the issue-4871-use-mem-take branch from 401b3d1 to 64855de Compare December 4, 2019 21:39

krishna-veerareddy changed the title ~~[WIP] Use mem::take instead of mem::replace when applicable~~ Use mem::take instead of mem::replace when applicable Dec 4, 2019

flip1995 added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties A-lint Area: New lints labels Dec 5, 2019

krishna-veerareddy force-pushed the issue-4871-use-mem-take branch 2 times, most recently from 0f6b46c to 38bb08d Compare December 8, 2019 03:10

tesuji reviewed Dec 8, 2019

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krishna-veerareddy mentioned this pull request Dec 8, 2019

add tests for using macros in as_conversions_lint #4888

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krishna-veerareddy requested a review from flip1995 December 16, 2019 19:34

krishna-veerareddy force-pushed the issue-4871-use-mem-take branch from 8a27af3 to 5c225e1 Compare December 19, 2019 06:16

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krishna-veerareddy force-pushed the issue-4871-use-mem-take branch 2 times, most recently from 8d1f0fc to 5d8366f Compare December 24, 2019 16:01

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krishna-veerareddy force-pushed the issue-4871-use-mem-take branch from aca6815 to 36cea1c Compare December 29, 2019 16:58

krishna-veerareddy force-pushed the issue-4871-use-mem-take branch from 36cea1c to 45e7b87 Compare December 29, 2019 18:06

krishna-veerareddy force-pushed the issue-4871-use-mem-take branch from 45e7b87 to f1e22c8 Compare December 30, 2019 14:21

krishna-veerareddy added 8 commits December 31, 2019 09:22

Use mem::take instead of mem::replace when applicable

8db319f

`std::mem::take` can be used to replace a value of type `T` with `T::default()` instead of `std::mem::replace`.

Add test cases for replace with Default::default()

2a75241

Prevent mem_replace_with_default lint within macros

26812f7

Also added test cases for internal and external macros.

Move mem_replace_with_default out of nursery

78b4dfc

Destructure mem:replace arguments

aa66f76

Lint within internal macros without a suggestion

c09e79e

Remove unnecessary import

a8413a3

Indicate anonymous lifetimes for types

42e4595

krishna-veerareddy force-pushed the issue-4871-use-mem-take branch from f1e22c8 to 42e4595 Compare December 31, 2019 17:28

bors merged commit 42e4595 into rust-lang:master Jan 4, 2020

bors mentioned this pull request Jan 4, 2020

New lint: pats_with_wild_match_arm #4960

Merged

krishna-veerareddy mentioned this pull request Jan 4, 2020

New lint: Suggest usage of mem::take #4871

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Use `mem::take` instead of `mem::replace` when applicable #4881

Use `mem::take` instead of `mem::replace` when applicable #4881

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Use mem::take instead of mem::replace when applicable #4881

Use mem::take instead of mem::replace when applicable #4881

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Use `mem::take` instead of `mem::replace` when applicable #4881

Use `mem::take` instead of `mem::replace` when applicable #4881

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