Issue with non-exported method interface definition with binary mode

[cclerget]

The following program sample.go triggers an unexpected result

package main

import (
	"fmt"
	"go/ast"
)

func NewBadExpr() ast.Expr {
	return &ast.BadExpr{}
}

func main() {
	fmt.Printf("%T\n", NewBadExpr().(*ast.BadExpr))
}

Expected result

$ go run ./sample.go
*ast.BadExpr

Got

$ yaegi ./sample.go
impossible type assertion: *ast.BadExpr does not implement ast.Expr (missing exprNode method)

Yaegi Version

v0.11.2

Additional Notes

[mvertes]

I tried to reproduce this issue on v0.11.2 and on HEAD of master, and could not, obtaining always the expected result. Are you sure of this ?

[cclerget]

Yes, I just updated the reproducer based on #1374