[bug #68101] Missed error with missing tilde in function output

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Follow-up Comment #4, bug #68101 (group octave):

I don't think it's bug for bug compatibility. I think the way Matlab and
Octave treat commas inside square/curly brackets is consistent, and it's the
same for both LHS and arrays.

As explained e.g. here:
https://stackoverflow.com/a/51969806/32345262
allowing one extra comma at the end of a list is common in different
languages. E.g. in Python, this is valid:


x=[
   1,
   2,
   3,
   4,
  ]


This makes it easier to add or remove elements from the list, and also to
generate the list programmatically. Allowing one extra comma at the beginning
is not common in other languages, but I think the idea is the same, only that
you put the comma before each element instead of after, like this:


x=[
  ,1
  ,2
  ,3
  ,4
  ]




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