Installing magento 2 with composer --dev gives error about Stopwatch

[PascalBrouwers]

Steps to reproduce

1. Install Magento using composer install --dev.
2. run bin/magento (with executable permission)

Expected result

1. List of commands from bin/magento with no error.

Actual result

1. Error message appears:
   We're sorry, an error occurred. Try clearing the cache and code generation directories. By default, they are: var/cache, var/di, var/generation, and var/page_cache.

   [ReflectionException]
   Class Symfony\Component\Stopwatch\Stopwatch does not exist
   

[mhabou]

Did you clear the cache and generation directories ???

rm -rf var/cache/* var/di/* var/generation/* var/page_cache/*

[PascalBrouwers]

nevermind, a 3rd party module was using Stopwatch in a Console command.