Cannot run embedded + generic code

[bysir]

The following program sample.go triggers an unexpected result

package main

type A struct {
	*b[string]
}

type b[T any] struct {
	data T
}

func main() {
  a := &A{
    b: &b[string]{},
  }

  _ = a
}

Expected result

// Nothing happend, it works fine.

Got

run: ./sample.go:13:3: unknown field b in struct literal

Yaegi Version

0.15.1

Additional Notes

Cannot run embedded + generic code, although they work in isolation.

[bysir]

Additional Note:

Both of the following pieces of code work fine:

type A struct {
	B *B[string]
}

type B[T any] struct {
	data T
}

a := &A{
	B: &B[string]{},
}

type A struct {
	*B
}

type B struct {
}

a := &A{
	B: &B{},
}

[bysir]

Maybe this "embedding" issue is related to #1502

[bysir]

This can be quickly fixed by modifying the fieldName method:

https://github.com/traefik/yaegi/blob/75e5f99bc5761d8e920e726f75932a31b6f06669/interp/type.go#L1227C1-L1238C2

func fieldName(n *node) string {
	switch n.kind {
	case selectorExpr:
		return fieldName(n.child[1])
	case starExpr:
		return fieldName(n.child[0])
	case identExpr:
		return n.ident
+	case indexExpr:
+		return fieldName(n.child[0])
	default:
		return ""
	}
}

But maybe this is not the most correct, because indexExpr seems to be the wrong kind.

---

Update: indexExpr is correct because go/ast is defined that way.