Function embedded

parse/getast.go:649–661

extract embedded field name so, for a struct like type A struct { io.Writer } we want "Writer"

(f ast.Expr)

//
// we want "Writer"
func embedded(f ast.Expr) string {
	switch f := f.(type) {
	case *ast.Ident:
		return f.Name
	case *ast.StarExpr:
		return embedded(f.X)
	case *ast.SelectorExpr:
		return f.Sel.Name
	default:
		// other possibilities are disallowed
		return ""
	}
}

// stringify a field type name
func stringify(e ast.Expr) string {