Recursive extraction is sometimes possible and sometimes not
Reported by Calixte DENIZET
Originally assigned to Calixte DENIZET
A=mlist('A');
deff('y=%A_e(field,ml)','y=mlist(''A'')');
A.a.b.c.d.e // ok
A('a').b.c.d.e // ok
A.a.b('c')('d').e //ok
A.a() //ok
// but
A().a // error
A.a.b() // error with stack problem