Avoid dangling ref if some code takes assings returned && to another &&

tests/QBind/QBind_impl.h

@@ -172,8 +172,8 @@ template<class T_> class Seq; //!< a Sequence data structure defined below
 template<class T_> class Val; //!< a choice of sequence(), record(), null(), or any value with at least a textual representation and possibly binary ones
 
 // Custom bind support
-template<typename T> using QBindFunction    =     Cursor   (*)(T &,Val<Cursor>&&);
-template<class   Ts> using QBindSeqFunction = Seq<Cursor>&&(*)(Ts&,Seq<Cursor>&&);
+template<typename T> using QBindFunction    =     Cursor (*)(T &,Val<Cursor>&&);
+template<class   Ts> using QBindSeqFunction = Seq<Cursor>(*)(Ts&,Seq<Cursor>&&);
 
 template<class T_> class Val
 {

tests/QBind/main.cpp

@@ -952,7 +952,7 @@ int main(int argc, char *argv[])
     return (fclose(samples)==0) &/*anyway*/ (fclose(results)==0);
 }
 
-Seq<Cursor>&& flatten(QList<Person>& ps, Seq<Cursor>&& s) {
+Seq<Cursor> flatten(QList<Person>& ps, Seq<Cursor>&& s) {
     for (auto&& p : ps) { // Iterating on ps only works for Write but flatten cannot be Read/Write anyway
         s = s
             .record()
@@ -1004,7 +1004,7 @@ void doGuiExample() {
     });
 #else
     // More expressive design similar to Python list comprehensions that does not work by default for Read/Write
-    QModelWriter<>(&customModel).sequence().bind(persons, +[](QList<Person>& t, Seq<Cursor>&& s)->Seq<Cursor>&& { // See https://stackoverflow.com/questions/18889028/a-positive-lambda-what-sorcery-is-this
+    QModelWriter<>(&customModel).sequence().bind(persons, +[](QList<Person>& t, Seq<Cursor>&& s)->Seq<Cursor> { // See https://stackoverflow.com/questions/18889028/a-positive-lambda-what-sorcery-is-this
         for (auto&& person : t) { // Read would require looping while !s.item()
             s = s // To keep working with the active Cursor
                 .record()