symfony/symfony — pull request #9004 by fabpot (2013-09-12 10:54:35+00:00)
Title: [DependencyInjection] added tags validation when compiling a container

| Q | A
| ------------- | ---
| Bug fix? | yes & no
| New feature? | yes & no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | #7543
| License | MIT
| Doc PR | n/a

When using YAML or XML, the tags validadity are checked during loading, but when using PHP, that's not possible.
So, the added step in the compilation phase does that nicely.