[Octave-bug-tracker] [bug #43098] "if (array)" should raise a warning, and give the same result for dense and sparse

[Lachlan Andrew]

Follow-up Comment #8, bug #43098 (project octave):

Ah yes.  Reading the original bug report.  That would help...
I've added some tests for pure-imaginary cases, returning Octave's actual
behaviour.  I don't know if it is documented, but it seems reasonable
behaviour.  However, I'm happy to change it if someone with more authority
says to.

The funny format is valid ("warning" is a function that returns a value).  The
syntax you suggested works fine for "test errwarn.cc-tst" from within Octave,
but fails (reports no error) for "make check".

I've also fixed up octave_value::is_equal() to call all() explicitly so that
the warning isn't thrown by, for example, switch statements.

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