[Octave-bug-tracker] [bug #60143] Error "function called with too many outputs" when assigning to a property with set method

[Markus Mützel]

Follow-up Comment #16, bug #60143 (project octave):

Re comment #11: I tried with the attached classes in Matlab R2020b:

>> a = bug60143_value;
>> a.t = 4
The set function for property 't' must return an instance of class
'bug60143_value'.
 
>> a.u = 3
method set.u

a = 

  bug60143_value with properties:

    t: []
    u: 3

>> b = bug60143_handle;
>> b.t=2
method set.t
In set function for property 't', the class of the output object is 'double';
the class of the input object is 'bug60143_handle'. They should be the same.
 
>> b.u = 4
method set.u

b = 

  bug60143_handle with properties:

    t: []
    u: 4


The syntax highlighter in its editor marks the set function for u in class
`bug60143_value` with an error highlight "Set Methods must have at most one
output.". But -- surprisingly -- it still seems to work (ignoring the extra
output).

It looks like it is possible that a set function of a handle class returns a
different instance of the same class. That's interesting. I didn't know this
was possible.

I didn't check yet how Octave would behave in these cases.

(file #50965, file #50966)
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Additional Item Attachment:

File name: bug60143_value.m               Size:0 KB
    <https://file.savannah.gnu.org/file/bug60143_value.m?file_id=50965>

File name: bug60143_handle.m              Size:0 KB
    <https://file.savannah.gnu.org/file/bug60143_handle.m?file_id=50966>



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