stmt/class: support extends (single inheritance) by struct embedding

node.go

@@ -107,6 +107,15 @@ func convert(n_ node.Node) (string, error) {
 		memberVars := []string{}
 		memberFuncs := []string{}
 
+		if n.Extends != nil {
+			parentName, err := resolveName(n.Extends.ClassName)
+			if err != nil {
+				return "", parseErr{n, err}
+			}
+
+			memberVars = append(memberVars, parentName+" // parent")
+		}
+
 		// Walk all child nodes of the class
 		for _, s_ := range n.Stmts {
 			switch s := s_.(type) {