…t arguments (Islam93)This PR was merged into the 5.1-dev branch.Discussion----------[DI] added possibility to define services with abstract arguments| Q             | A| ------------- | ---| Branch?       | master| Bug fix?      | no| New feature?  | yes| Deprecations? | no| Tickets       |Fix#31769| License       | MIT| Doc PR        | n/afeature caused by rfc#31769 from issues listI hope, this PR will be useful   Abstract argument have to replaced by one of compiler passes or exception will be thrown.   Example:   This service definition   ```xml   ...    <service>       <argument key="$a" type="abstract">should be defined by TestPass</argument>    </service>   ...   ```or this for yaml```yaml    App\Test\Test:        arguments:            $a: !abstract should be defined by TestPass```   causes exception like `Argument "$a" of service "App\Test\Test" is abstract (should be defined by TestPass), did you forget to define it?`   if argument was not replaced by compiler pass   ```php   ...    public function process(ContainerBuilder $container)    {        $test = $container->getDefinition(Test::class);        $test->setArgument('$a', 'test');    }   ...   ```Commits-------62fefaa [DI] added possibility to define services with abstract arguments