how to call interface method as function

[ivory geyser]

Why this code can't compile

https://go.dev/play/p/-niwfm_-mOF

---

But this one compile

https://go.dev/play/p/0BtNR-PIDHA

---

Both times we called an interface method as a function

But one time it's good
But other one not

[halcyon wedge]

automatic method promotion to the pointer type does not apply to interface types

https://go.dev/ref/spec#Method_sets

The method set of a pointer to a defined type T (where T is neither a pointer nor an interface) is the set of all methods declared with receiver *T or T.