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derive(Default) suppresses warn(dead_code) #98871
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A-diagnostics
Area: Messages for errors, warnings, and lints
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
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CAD97
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A-diagnostics
Area: Messages for errors, warnings, and lints
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
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Jul 4, 2022
Probably a duplicate of #47851 |
Definitely related but maybe not a duplicate; #47851 is about explicit impls whereas this is a subset for just |
I thought the dead code lint (or other lints?) actually mentioned they didn't do this explicitly. Like, "this lint ignores automatic derives" or something. |
Ah, unused field lint does:
|
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Jun 25, 2024
…ichaelwoerister Detect unused structs which derived Default <!-- If this PR is related to an unstable feature or an otherwise tracked effort, please link to the relevant tracking issue here. If you don't know of a related tracking issue or there are none, feel free to ignore this. This PR will get automatically assigned to a reviewer. In case you would like a specific user to review your work, you can assign it to them by using r? <reviewer name> --> Fixes rust-lang#98871
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Rollup merge of rust-lang#126302 - mu001999-contrib:ignore/default, r=michaelwoerister Detect unused structs which derived Default <!-- If this PR is related to an unstable feature or an otherwise tracked effort, please link to the relevant tracking issue here. If you don't know of a related tracking issue or there are none, feel free to ignore this. This PR will get automatically assigned to a reviewer. In case you would like a specific user to review your work, you can assign it to them by using r? <reviewer name> --> Fixes rust-lang#98871
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Labels
A-diagnostics
Area: Messages for errors, warnings, and lints
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Given the following code: [playground]
The current output is:
Ideally the output should look like:
After the derive, the code looks roughly like
As the default implementation is both 1) itself unused and 2)
#[automatically_derived]
, ideally it should not count as a use for suppressing thedead_code
lint onT
.The derived implementations for
Clone
,Debug
,PartialEq
, andHash
also show this behavior.I seem to recall a previous change to
#[automatically_derived]
to change the interaction between the unused code lint and derived implementations, but could not find it offhand.The text was updated successfully, but these errors were encountered: