[Octave-bug-tracker] [bug #58945] Octave parser allows keyword 'end' as a function parameter

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?58945>

                 Summary: Octave parser allows keyword 'end' as a function
parameter
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Thu 13 Aug 2020 03:08:07 PM PDT
                Category: Interpreter
                Severity: 2 - Minor
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: Any

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Details:

Keywords are reserved, and shouldn't be available for use as variable names. 
This is the case for the keyword 'end' when used on the command line.  For
example,


end = 1
error: parse error:

  syntax error

>>> end = 1
         ^


It might be nicer to have a more specific message then just "syntax error" in
this case, but it still does prevent user's from re-assigning a keyword.

On the other hand, this function allows assigning to a keyword via the
parameter name of a function.


function y = fend (end)
  disp (end(1:end));
end


For certain values of the input parameter, such as 1, this works.  In Matlab,
there is an error on line 1, column 20 which is the start of the keyword
"end".

This is a small priority so I've made the severity minor.

Also, 'end' was just an example.  One can alias any keyword such as 'for',
'while', etc.







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