From: monnier@iro.umontreal.ca   
      
   > There is one additional, quite thorny issue:  How to maintain   
   > state for nested functions to be invoked via pointers, which   
   > have to have access local variables in the outer scope.   
   > gcc does so by default by making the stack executable, but   
   > that is problematic.  An alternative is to make some sort of   
   > executable heap.  This is now becoming a real problem, see   
   > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117455 .   
      
   AFAIK this is a problem only in those rare languages where a function   
   value is expected to take up the same space as any other pointer while   
   at the same time supporting nested functions.   
      
   In most cases you have either one of the other but not both.  E.g. in   
   C we don't have nested functions, and in Javascript functions are   
   heap-allocated objects.   
      
   Other than GNU C (with its support for nested functions), which other   
   language has this weird combination of features?   
      
      
           Stefan   
      
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