Panic on Type Assertion with Interface

[omarsy]

Description:

Issue Summary:

A panic occurs when performing a type assertion on an interface{} in Gnolang. The following code works as expected in Go (Golang), but in Gnolang, it results in a runtime panic:

package main

import "fmt"

func main() {
	var i interface{} = 1
	var a, ok = i.(int)
	fmt.Println(a, ok)
}

Expected Behavior:

The code should execute without panic, correctly performing the type assertion. The expected output should be:

1 true

Actual Behavior:

In Gnolang, running the above code causes a panic with the message:

panic: interface conversion: gnolang.Expr is *gnolang.TypeAssertExpr, not *gnolang.CallExpr

This suggests an issue with how type assertions are being handled internally, specifically when converting types within the interface.

[thehowl]

yes; we should unify the code for DeclStmt and AssignStmt (ie. := and var x =); as they are supposed to be almost equivalent in the go spec but they do very different things in preprocess

[omarsy]

Yes, I think too. I don't know why we didn't do that.