[Octave-bug-tracker] [bug #60254] crash on loading dependent class constant properties

[Paul Netsaver]

URL:
  <https://savannah.gnu.org/bugs/?60254>

                 Summary: crash on loading dependent class constant properties
                 Project: GNU Octave
            Submitted by: netsaver
            Submitted on: Thu 18 Mar 2021 05:58:32 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error or Warning
                  Status: None
             Assigned to: None
         Originator Name: Netsaver Paul
        Originator Email: 
             Open/Closed: Open
                 Release: 6.2.0
         Discussion Lock: Any
        Operating System: Microsoft Windows

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Details:

from Matlab's help:

classdef NamedConst
   properties (Constant)
      R = pi/180
      D = 1/NamedConst.R
      AccCode = '0145968740001110202NPQ'
      RN = rand(5)
   end
end


Then if I save to NamedConst.m and (after refreshing with 'clear all',
otherwise class definition is not updated) and recall NamedConst.R (or
anyother) from shell command, Octave (6.2) quits after few seconds (with CPU
load and fan speed rapidly increasing).

I can imagine a recursive trap in the loading phase, where D is constant,
because assigned only one time, but dependent on R.
It's like at D definition time, it cannot find temporary class structure in
order to get R and has to reload again the definition...

I didn't classify as Matlab incompatibility as I don't know if the wanted
Octave feature it to clone this capability or we should avoid dependent
constant properties...

Can someone try to repeat it?

Thanks and regards,
Paul Netsaver, Rome




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