Feature request

All those cases are fatal errors, but are ok in PHPStan:

• Non-existent method referenced (PHPStan)
• Collission caused by alias (PHPStan)
• Implicit collission (PHPStan)
• Inconsistent insteadof definition (PHPStan)
• Usage of not referenced trait (PHPStan)
  • Also, this is not valid, but this is fine

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