Fix UnusedVariable false positives for private record parameters #3837
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Marcono1234
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@cushon, are the changes ok like this or do you want anything changed? |
cushon
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Aug 9, 2023
| // to contain usage in that case, but parameter is always used implicitly | ||
| // For compact canonical constructor parameters don't have record flag so need to | ||
| // check constructor flags (`symbol.owner`) instead | ||
| if (hasRecordFlag(symbol) || hasRecordFlag(symbol.owner)) { |
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Are there any cases where hasRecordFlag(symbol) is true but hasRecordFlag(symbol.owner) isn't?
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Are you asking if this could be simplified to only check hasRecordFlag(symbol.owner)?
It looks like the tests still pass if I locally remove the additional hasRecordFlag(symbol) check, should I change this then?
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Are you asking if this could be simplified to only check
hasRecordFlag(symbol.owner)?
Yes
It looks like the tests still pass if I locally remove the additional
hasRecordFlag(symbol)check, should I change this then?
I think so, unless you suspect there might be cases where checking both is necessary?
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unless you suspect there might be cases where checking both is necessary?
I am not aware of any; have changed it now to only check symbol.owner.
core/src/test/java/com/google/errorprone/bugpatterns/UnusedVariableTest.java
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cushon
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Aug 15, 2023
cushon
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Aug 15, 2023
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Fixes #2713 It looks like the tree emitted by the compiler is incomplete for the canonical constructor of a record, which is why the parameters were erroneously flagged as unused. Apparently this only affected `private` record classes because for them the implicit canonical constructor is `private` as well, and the `UnusedVariable` check treats parameters of `private` methods and constructors differently. #2713 (comment) showed an example where this also affected record fields, however I was unable to reproduce that. Maybe they were using an older Error Prone version which does not include 47da3af, their sample code is incomplete, or my test setup was incorrect. Edit: It looks like they were using an older Error Prone version, see #2713 (comment). Fixes #3837 FUTURE_COPYBARA_INTEGRATE_REVIEW=#3837 from Marcono1234:record-unused-param-false-positives 4535778 PiperOrigin-RevId: 557194050
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Fixes #2713 It looks like the tree emitted by the compiler is incomplete for the canonical constructor of a record, which is why the parameters were erroneously flagged as unused. Apparently this only affected `private` record classes because for them the implicit canonical constructor is `private` as well, and the `UnusedVariable` check treats parameters of `private` methods and constructors differently. #2713 (comment) showed an example where this also affected record fields, however I was unable to reproduce that. Maybe they were using an older Error Prone version which does not include 47da3af, their sample code is incomplete, or my test setup was incorrect. Edit: It looks like they were using an older Error Prone version, see #2713 (comment). Fixes #3837 FUTURE_COPYBARA_INTEGRATE_REVIEW=#3837 from Marcono1234:record-unused-param-false-positives 4535778 PiperOrigin-RevId: 557197001
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Fixes #2713 It looks like the tree emitted by the compiler is incomplete for the canonical constructor of a record, which is why the parameters were erroneously flagged as unused. Apparently this only affected `private` record classes because for them the implicit canonical constructor is `private` as well, and the `UnusedVariable` check treats parameters of `private` methods and constructors differently. #2713 (comment) showed an example where this also affected record fields, however I was unable to reproduce that. Maybe they were using an older Error Prone version which does not include 47da3af, their sample code is incomplete, or my test setup was incorrect. Edit: It looks like they were using an older Error Prone version, see #2713 (comment). Fixes #3837 FUTURE_COPYBARA_INTEGRATE_REVIEW=#3837 from Marcono1234:record-unused-param-false-positives 4535778 PiperOrigin-RevId: 557197001
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Fixes #2713
It looks like the tree emitted by the compiler is incomplete for the canonical constructor of a record, which is why the parameters were erroneously flagged as unused. Apparently this only affected
privaterecord classes because for them the implicit canonical constructor isprivateas well, and theUnusedVariablecheck treats parameters ofprivatemethods and constructors differently.#2713 (comment) showed an example where this also affected record fields, however I was unable to reproduce that. Maybe they were using an older Error Prone version which does not include 47da3af, their sample code is incomplete, or my test setup was incorrect.
Edit: It looks like they were using an older Error Prone version, see #2713 (comment).