cmd/compile: allow interface pointers to be used as pointers to subset interface types in calls, rather than being unable to obtain addresses

[qiulaidongfeng]

What version of Go are you using (go version)?

$ go version
tip

Does this issue reproduce with the latest release?

yes.

What operating system and processor architecture are you using (go env)?

go env Output

$ go env

What did you do?

https://go.dev/play/p/tdRYybgfMzt?v=gotip

What did you expect to see?

I hope to see the compilation pass.

I think local variables should be able to obtain addresses.

What did you see instead?

./prog.go:23:7: invalid operation: cannot take address of I1(j) (value of type I1)

[zigo101]

Now, intermediate values can't be taken addresses in Go: https://go101.org/article/unofficial-faq.html#unaddressable-values

[thanm]

Hi @qiulaidongfeng this seems more like a language question as opposed to a compiler bug -- the compiler is being consistent with the way the language is defined. If you have questions about addressability in Go, probably best to consult a forum like golang-nuts mailing list.