Resolve duplicate diag message for: tests/ui/renamed_builtin_attr.rs

[grtn316]

This PR is to resolve duplicate diag messages for the renamed_builtin_attr UI test which is related to: #12379

This was caused by multiple functions calling the get_attr function resulting in the deprecated attribute to be reevaluated.

I added a state to the attr.rs file to track if the warning has already been emitted and skip the evaluation if the attribute warning has already been emitted.

changelog: [renamed_builtin_attr]: Fix duplicate diagnostics

[rustbot]

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[Alexendoo]

This one is a bit of an edge case compared to the others since it's not being caused by a single lint. Since the deduplication here is similar to what the diagnostic infrastructure is doing internally it might be worth keeping this one as a duplicate emitter

[Manishearth]

r? @Alexendoo

[grtn316]

This one is a bit of an edge case compared to the others since it's not being caused by a single lint. Since the deduplication here is similar to what the diagnostic infrastructure is doing internally it might be worth keeping this one as a duplicate emitter

Hi @Alexendoo. The only thing worth mentioning is that currently, without this fix, each deprecated attribute will be evaluated 4x which means 4 messages per attribute will be emitted. With this fix it will only be emitted once. More of a cosmetic thing but wanted to mention just in case.

[bors]

:umbrella: The latest upstream changes (presumably #12999) made this pull request unmergeable. Please resolve the merge conflicts.

[Alexendoo]

UI wise duplicates are hidden by default, we set -Zdeduplicate-diagnostics=no to show duplicates as it may indicate an issue. You're right though that it's still being evaluated repeatedly which is wasteful, we could move the check into e.g. https://github.com/rust-lang/rust-clippy/blob/68a799aea9b65e2444fbecfe32217ce7d5a3604f/clippy_lints/src/attrs/mod.rs#L532

so it's only happening once per attribute

[Alexendoo]

@rustbot author

[rustbot]

:umbrella: The latest upstream changes (possibly d28d2344d000aa96bef729cf408731f952f71fb0) made this pull request unmergeable. Please resolve the merge conflicts.

[J-ZhengLi]

@grtn316 Hi, this is a ping from triage, would you mind resolving the merge conflicts and take look of the last comment by 'Alexendoo'?

[Jarcho]

Closing this since there's been no response. @grtn316 if you wish to come back to this feel free to reopen this or create a new PR.