Error `cannot convert type <*main.b> to interface <error>` on valid Go code

[codemicro]

When attempting to run the following snippet of Go code in the latest version of gophernotes, v0.7.4, I get the following error:

import "fmt"

type b struct {}
func (*b) Error() string { return "hi" }

func main() {
 var e error
 e = &b{}

 fmt.Println(e)
}

repl.go:8:9: error compiling assignment: e = &b{}
	repl.go:8:9: cannot convert type <*main.b> to interface <error>: missing method Error

However, running essentially the same snippet with a package main declaration at the top yields the correc output.

package main

import "fmt"

type b struct {}
func (*b) Error() string { return "hi" }

func main() {
 var e error
 e = &b{}

 fmt.Println(e)
}

> go run main.go 
hi

:)

[cosmos72]

This is really weird:
I can reproduce the issue with gophernotes, but running your snippet in gomacro works as expected.
And they use the same interpreter (I used exactly matching version).

I will try to better examine this issue in the next days

[jgoldschrafe]

Unsure if this is remotely helpful, but I can confirm I'm hitting this issue as well, and able to reproduce it using the snippet above.

• macOS Monterey
• Gophernotes 0.7.5
• Go 1.19.3
• Python 3.10.5

Jupyter core at the following versions:

Selected Jupyter core packages...
IPython : 8.6.0
ipykernel : 6.16.2
ipywidgets : not installed
jupyter_client : 7.4.4
jupyter_core : 4.11.2
jupyter_server : 1.21.0
jupyterlab : 3.5.0
nbclient : 0.7.0
nbconvert : 7.2.3
nbformat : 5.7.0
notebook : 6.5.2
qtconsole : not installed
traitlets : 5.5.0

Additionally, I can confirm that any interface methods seem to have difficulty resolving, not just error.

[cosmos72]

seems to be fixed in @latest version (not yet released with a formal version number)