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

$ go version
go version devel +2298dab082 Thu Oct 22 00:19:08 2020 +0000

Does this issue reproduce with the latest release?

I think this is the latest commit on the dev.go2go branch.

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

$ go env
darwin/amd64

What did you do?

I maintain a package that uses cgo and could benefit from generics. I decided to create a branch to see how I liked the generics (for what it's worth: thumbs up so far!), but I started having issues with import "C".

I created a very small Hello World example that gives me the same issues I see with my "real world" package. Single file package with the name hello.go2.

package main

// #include <stdio.h>
//
// void Hello() {
// 	printf("Hello World\n");
// }
import "C"

func main() {
	C.Hello()
}

What did you expect to see?

Hello World

If I change the file extension from .go2 to .go and do a normal go run, this is indeed what I see.

What did you see instead?

type checking failed for main
/var/folders/k6/8msxm8_x7ldbknfzp7cyzn680000gn/T/go2go-run942322282/hello.go2:8:8: could not import C (unknown import path "C": internal error: module loader did not resolve import)