Looks like Psalm doesn't recognize class aliases

[runtothefather]

Faced with the issue with fatal error while psalm processing the project, it is failed on the psalm --init command when processing the line with class alias definition
the exact example was

try {
  //some code
} catch (\Doctrine\Common\Persistence\Mapping\MappingException $e) { -- fatal on this line
}

looks like due to class been moved into another namespace, psalm doesn't parse this
tried to simulate situation in the sandbox https://psalm.dev/r/c63cf9ad4b

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/c63cf9ad4b

<?php
namespace UserException;

class UserException extends \Exception {
	
}

namespace Alias\UserException;

use function class_alias;

class_alias(
	\UserException\UserException::class, 
	'\Alias\UserException\UserExceptionAlias'
);

namespace Client;

try {
	throw new \Alias\UserException\UserExceptionAlias();
} catch (\Alias\UserException\UserExceptionAlias $e) {
    var_dump($e);
}

Psalm output (using commit 769ac5c):

ERROR: UndefinedClass - 20:12 - Class or interface Alias\UserException\UserExceptionAlias does not exist

ERROR: UndefinedClass - 21:10 - Class or interface Alias\UserException\UserExceptionAlias does not exist

[weirdan]

Also, this: https://psalm.dev/r/15b31a80cf crashes.

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/15b31a80cf

<?php
namespace UserException;

class UserException extends \Exception {
	
}

namespace Alias\UserException;

use function class_alias;

class_alias(
	\UserException\UserException::class, 
	\Alias\UserException\UserExceptionAlias::class
);

namespace Client;

try {
	throw new \Alias\UserException\UserExceptionAlias();
} catch (\Alias\UserException\UserExceptionAlias $e) {
    var_dump($e);
}

Psalm encountered an internal error:

/vendor/vimeo/psalm/src/Psalm/Internal/Provider/ClassLikeStorageProvider.php: Could not get class storage for alias\userexception\userexceptionalias

[BenjaminHoegh]

Seems like you can trigger the issue if you do this

class_alias(class_exists('SomeClassExtra') ? 'SomeClassExtra' : 'SomeClass', 'SomeClassParentAlias');

class SomeClassExtended extends SomeClassParentAlias
{