[Octave-bug-tracker] [bug #57591] Segmentation faults when running the test suite

[Markus Mützel]

Follow-up Comment #176, bug #57591 (project octave):

The whole lifetime thingy might be a red herring. And I'm not sure if I
correctly understand:
https://en.cppreference.com/w/cpp/language/lifetime
> [...] the following uses of the glvalue expression that identifies that
object are undefined, unless the object is being constructed or destructed
(separate set of rules applies):
>
> 1. Lvalue to rvalue conversion (e.g. function call to a function that takes
a value).

Perusing through the code that is being called in the tests for gmres:
https://hg.savannah.gnu.org/hgweb/octave/file/b8c7c550e86f/libinterp/corefcn/cellfun.cc#l2469

            retcell = do_cellslices_nda (x.array_value (),
                                         lb, ub, dim);


Does x.array_value () constitute a glvalue expression? Is calling a function
with that lvalue causing undefined behavior?

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