gistfile1.txt

{
    "name": "testing-composer-resolution",
    "description": "testing composer-resolution",
    "minimum-stability": "dev",
    "require": {
	"doctrine/doctrine-mongo-odm-module": "dev-master",
        "doctrine/doctrine-orm-module": "dev-master"
    }
}


results in 


Loading composer repositories with package information
Installing dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for doctrine/doctrine-mongo-odm-module dev-master -> satisfiable by doctrine/doctrine-mongo-odm-module[dev-master].
    - doctrine/doctrine-mongo-odm-module dev-master requires doctrine/doctrine-module 0.7.* -> satisfiable by doctrine/doctrine-module[0.7.0, 0.7.1].
    - Can only install one of: doctrine/doctrine-module[0.8.x-dev, 0.7.0].
    - Can only install one of: doctrine/doctrine-module[0.8.x-dev, 0.7.1].
    - doctrine/doctrine-orm-module dev-master requires doctrine/doctrine-module 0.8.* -> satisfiable by doctrine/doctrine-module[0.8.x-dev].
    - Installation request for doctrine/doctrine-orm-module dev-master -> satisfiable by doctrine/doctrine-orm-module[dev-master].