Fix incorrect type inference for @phpstan-assert-if-true on $this with union types #4246
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please have a look at the issue-bot github action job summary. it seems this PR also affects other issues. please add regression tests for those which are getting fixed |
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Thanks, @staabm. I’ll review the issue-bot GitHub Action job summary and add regression tests for the additionally affected issues. This is my first time contributing to open source (and my first PR to PHPStan), so I’ll update this PR in small batches as I add tests. If you prefer a specific location or pattern for these tests, please let me know. |
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Welcome 🤗 Type related tests go usually into the https://github.com/phpstan/phpstan-src/tree/2.1.x/tests/PHPStan/Analyser/nsrt/ directory. Files located in this directory will automatically checked against using assertType(). |
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Regression tests are typically added to existing test classes for rules that reported the (disappeared) errors. Alternatively covering some bugs with simple type inference tests (in |
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| namespace Bug13358; | |||
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You can move this also into nsrt/ folder
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| use PHPStan\Testing\TypeInferenceTestCase; | ||
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| class AssertIfTrueOnThisTest extends TypeInferenceTestCase |
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This file can be dropped when everything else moved into nsrt/
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@staabm The reason I want to run it individually is because I’d like to debug a specific function and check only the information related to this test case, without running everything else. Could you tell me how to do that? Thanks! |
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This pull request has been marked as ready for review. |
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Added regression test for #11441 (bug-11441.php) and updated the description accordingly. |
closes phpstan/phpstan#13358
closes phpstan/phpstan#11441
Summary
@phpstan-assert-if-trueon$thiswith union types produced incorrect type inference.Repro
See added test:
tests/PHPStan/Rules/Methods/AssertIfTrueOnThisTest.php.Cause
Union handling for
$thisassertions wasn’t propagated intoTypeSpecifier(assert-based refinement path).Fix
Normalize/refine
$thisunion members before producingSpecifiedTypesfrom assert info.Tests
AssertIfTrueOnThisTest.php.Also fixes #11441
tests/PHPStan/Analyser/nsrt/bug-11441.php.@phpstan-assert !null $this->getParam()works correctly when called on union types (Foo|Bar), where each class defines its own method.nulltype was not removed in such cases. After the fix,int|stringis correctly inferred.