[Octave-bug-tracker] [bug #29476] Parser incompatibility for keywords against Matlab implementation, infinite loop

[Paul Ortyl]

URL:
  <http://savannah.gnu.org/bugs/?29476>

                 Summary: Parser incompatibility for keywords against Matlab
implementation, infinite loop
                 Project: GNU Octave
            Submitted by: ortylp
            Submitted on: Thu 08 Apr 2010 04:48:38 PM GMT
                Category: Interpreter
                Severity: 3 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.3.51
        Operating System: GNU/Linux

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Details:

Here below is a stripped down piece of code, which parses and works in Matlab
(R2008a), fails in Octave 3.2.4, fails and hangs Octave 3.3.51.

------------------------------
function this = a()

 this.do = @do;

 function this = do(this, in)
  this = this+in;
 end
end
-----------------------------

=============================
error: function handles may not refer to keywords
parse error near line 3 of file a.m

  syntax error

>>>   this.do = @do;
                ^

error: function handles may not refer to keywords
parse error near line 3 of file a.m

  syntax error

>>>   this.do = @do;
                ^
================================

The problem is usage of keyword 'do' as function name.  As long as it is
unambiguous, and in the example above IT IS, the keyword was accepted as
function name and allowed in the reference to be assigned.

Octave 3.2.4 reports the error and returns to prompt, version 3.3.51 does not
return but hangs taking 100% of CPU time.





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