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confusing "invalid use of end" message in octave-4.2.2

From: Sergei Steshenko
Subject: confusing "invalid use of end" message in octave-4.2.2
Date: Wed, 15 May 2019 06:49:00 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

Hello All,

here is a simple example of interactive session demonstrating the probblem:


octave:1> foo(end)
error: invalid use of end
octave:1> version
ans = 4.2.2

The truth is that 'foo' is undefined, but instead of stating this clearly first Octave just prints "error: invalid use of end".

In real life I've stumbled upon this using 'plot' commands with some undefined variables, and it was difficult to find out which exactly variable was undefined.


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