[Octave-bug-tracker] [bug #57256] Using global variable in nested function makes variable disappear in parent function

[Marc Repnow]

URL:
  <https://savannah.gnu.org/bugs/?57256>

                 Summary: Using global variable in nested function makes
variable disappear in parent function
                 Project: GNU Octave
            Submitted by: qx1147
            Submitted on: Mon 18 Nov 2019 01:07:18 PM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.1.0
        Operating System: Any

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Details:

Calling the following demo function fails with an "'s' undefined near line 5"
error, so calling the nested() function, which accesses the global variable
's' (with or without declaring it "global"), makes the global variable 's'
disappear in demo() thereafter. I can bring 's' back, however, with another
"global" statement.
The same code works fine in Octave 4.2.1.
 

function demo()
    global s=99   
    nested();
#    global s        % needed for making 's' accessible again.
    fprintf('demo(): s=%d.\n', s);
    
    function nested()
        fprintf('nested(): s=%d.\n', s);
    end
end


Output:

>> demo

nested(): s=99.
error: 's' undefined near line 5 column 32
error: called from
    demo at line 5 column 5


Output with old Octave, or when using the second "global" statement:

>> demo

nested(): s=99.
demo(): s=99.






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