go/types: interface.Complete panics for interfaces with duplicate methods [1.20 backport] #61744
Description
@findleyr requested issue #61737 to be considered for backport to the next 1.20 minor release.
This is a deterministic panic when correctly using the go/types API.
(Opened this issue on @gopherbot's behalf since gopherbot is waiting on #25574 to be resolved.)