Problem parsing annotations with doctrine/lexer 2?

[herndlm]

I updated doctrine/annotations (1.14.2 => 2.0.0) and suddenly got such errors

Fatal: Uncaught Doctrine\ORM\Mapping\MappingException: Class "Acme\User" is not a valid entity or mapped super class.

Also got some warnings that looked suspicious:

 Warning: Attempt to read property "type" on array in /var/www/html/analytics.icis.com/vendor/doctrine/annotations/lib/Doctrine/Common/Annotations/DocParser.php on line 675

After looking around a bit I could confirm that indeed https://github.com/doctrine/annotations/blob/2.0.0/lib/Doctrine/Common/Annotations/DocParser.php#L675 is an array with the key type and most likely that leads to $classAnnotations being empty in Doctrine\ORM\Mapping\Driver\AnnotationDriver::loadMetadataForClass() which throws that exception.

doctrine/lexer is installed in 2.1.0 being required by other doctrine packages like this one

➜ composer why doctrine/lexer
doctrine/annotations 2.0.0  requires doctrine/lexer (^2 || ^3)
doctrine/orm         2.14.0 requires doctrine/lexer (^1.2.3 || ^2)

I'm now wondering - am I doing something wrong here? Most likely this shouldn't have broken just by updating? I'm unfortunately not accustomed with the Doctrine code base well, otherwise I wouldn't have to ask here :)

Looks like #465 is related.

Some more step debugging input in case this helps

[herndlm]

found the problem 🤦‍♂️

this is some legacy app which has another composer.json where doctrine/lexer v1 was still in use which was autoloaded before...... and the tokens there were of course still arrays instead of objects

sorry for the noise