Why is this an invalid argument? #11637

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zluiten asked this question in Q&A

zluiten
Jan 5, 2026

I don't understand why this is an invalid argument. The method should accept any subtype/implementation of the interface right?

https://psalm.dev/r/03d4d75335

Replies: 1 comment

orklah
Jan 5, 2026
Collaborator

Here's the explanation:
https://psalm.dev/docs/annotating_code/templated_annotations/#template-covariance

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