Fix phpstan/phpstan#12686: Unable to mark an anonymous function as impure#5348
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- Added purity check for callable variable calls ($f()) in TypeSpecifier::createForExpr() - Previously, only named function calls (e.g. rand()) had purity checks that prevented type narrowing for impure functions; callable variable calls were missing this check - New regression test in tests/PHPStan/Analyser/nsrt/bug-12686.php
Tests the code path where a variable holds a union of closures (multiple callable parameter acceptors): one test with mixed pure/impure closures verifying no narrowing, and one with all pure closures verifying narrowing still works. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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add a regression test for
Both issues report that closures cannot be marked as impure via PHPDoc. These tests verify that @phpstan-impure on closures prevents incorrect type narrowing in conditional branches. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Done. Added regression tests for both issues:
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bug 6822 was about a false-positive rule error. we need a rule test for this file to prove it no longer errors.
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Done. Added a rule test for bug 6822 in IfConstantConditionRuleTest that verifies impure closures (@phpstan-impure) don't produce false-positive "If condition is always true" errors when used in nested conditions. The test data file at tests/PHPStan/Rules/Comparison/data/bug-6822.php covers both bool-returning and int-returning impure closures.
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re-use the tests/PHPStan/Analyser/nsrt/bug-6822.php for the new rule-test instead of adding another new one
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Full test suite passed too. All done — the review feedback has been addressed, tests and static analysis are green, and the commit is pushed.
…e error The nsrt test only verified type inference. This adds an IfConstantConditionRule test to prove that impure closures don't cause false "If condition is always true" errors when used in nested conditions. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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This doesn't really fix phpstan/phpstan#3770 right? |
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It does not, sorry |
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Summary
When a closure variable like
$fwas called in a condition (if ($f())), PHPStan incorrectly narrowed the type of subsequent$f()calls inside the branch, treating the closure as pure even when it had impure points. This caused$f()to be inferred astrueinstead ofboolinside the truthy branch.Changes
FuncCallexpressions (callable variable calls) insrc/Analyser/TypeSpecifier.phpcreateForExpr()methodCallableParametersAcceptor::isPure()to determine if the callable has side effectstests/PHPStan/Analyser/nsrt/bug-12686.phpRoot cause
TypeSpecifier::createForExpr()already had purity checks for named function calls ($expr->name instanceof Name), method calls, and static calls. When a function had side effects, the method returned emptySpecifiedTypes, preventing type narrowing from caching the call result. However, callable variable calls ($f()where$expr->nameis anExpr) were missing this check entirely. This meant closures that called impure functions likerand()still had their return types cached/narrowed across calls.Test
Added
tests/PHPStan/Analyser/nsrt/bug-12686.phpwhich verifies:$fcallingrand()) returnsbool(nottrue) when called again inside anif ($f())block$hreturningtrue) still correctly narrows totrueinside the if blockFixes phpstan/phpstan#12686
Fixes phpstan/phpstan#3770
Fixes phpstan/phpstan#6822