Automatic function prototype generation does not work inside namespaces

[nickgammon]

In the example code below I am placing some functions into a namespace to avoid clashes. (This is in answer to a question about combining two sketches). However the automated function-prototype generation seems to be suppressed inside a namespace.

namespace foo 
{
//  void bar ();
  
  void fubar ()
     {
     bar (); 
     }  // end of fubar
     
  void bar ()
    {
    }  // end of bar
}  // end of namespace foo 

void setup()
{
  foo::fubar ();
}  // end of setup

void loop()
{
}  // end of loop

If you uncomment the manual function prototype near the top the code compiles OK. As written however I get the error:

/home/nick/Pictures/Blink tutorial/Example/Example.ino: In function 'void foo::fubar()':
Example:7: error: 'bar' was not declared in this scope
      bar (); 
           ^
exit status 1
'bar' was not declared in this scope

This is with IDE 1.8.1.

[facchinm]

Hi Nick, prototypes are not autogenerated for classes and namespaces (see https://github.com/arduino/arduino-builder/blob/a4ede088e7f5fa67fd7c2f12b94e3124126bae00/src/arduino.cc/builder/ctags/ctags_parser.go#L206) . The reason is that it's really difficult to find the correct insertion point for these prototypes, so we avoid creating them (silently). Maybe this proposal could help? Would you mind continuing the discussion there?

[nickgammon]

OK, I'll close this issue as it seems to be by design.