Fix phpstan/phpstan#9733: PHPDoc types from overridden function are not included in trait typeinfo when aliased

[phpstan-bot]

Summary

When a trait method is aliased using use MyTrait { test as test2; }, PHPDoc types from the overridden parent method were not inherited by the aliased method. This caused false positive missingType.iterableValue errors and incorrect type inference inside the trait method body.

Changes

• Added resolveOriginalMethodName() helper method to src/PhpDoc/PhpDocInheritanceResolver.php that resolves trait alias names back to original method names using ClassReflection::getNativeReflection()->getTraitAliases()
• Modified resolvePhpDocForMethod() to use the original method name when looking up PHPDoc in parent classes, interfaces, and traits

Root cause

When a trait method test is aliased as test2, PHPStan's PhpDocInheritanceResolver::resolvePhpDocForMethod() was called with the alias name test2. It then tried to find test2 in the parent class (which only has test), in interfaces, and in traits — all lookups failed because none of them have a method named test2. The fix resolves the alias back to the original method name before performing these lookups.

Test

Added tests/PHPStan/Analyser/nsrt/bug-9733.php — an NSRT test with a base class declaring abstract test(array $array) with @param int[] $array, a trait implementing it, and a class using the trait with test as test2. The test asserts that $array inside the trait method body has type array<int>.

Fixes phpstan/phpstan#9733