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

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Follow-up Comment #10, bug #68101 (group octave):


>> [a, b] = deal (1, 2)
a =
     1
b =
     2
>> [, a, b] = deal (1, 2)
a =
     1
b =
     2
>> [, , a, b] = deal (1, 2)
 [, , a, b] = deal (1, 2)
    ↑
Invalid expression. When calling a function or indexing a variable, use
parentheses.
Otherwise, check for mismatched delimiters.
 

>> [a, b, ] = deal (1, 2)

a =
     1
b =
     2
>> [a, b, , ] = deal (1, 2)
  [a, b, , ] = deal (1, 2)
         ↑
Invalid expression. When calling a function or indexing a variable, use
parentheses.
Otherwise, check for mismatched delimiters.
 

>> [, 1, 2]
ans =
     1     2
>> [, , 1, 2]
  [, , 1, 2]
     ↑
Invalid expression. When calling a function or indexing a variable, use
parentheses.
Otherwise, check for mismatched delimiters.
 

>> [1, 2, ]
ans =
     1     2
>> [1, 2, , ]
  [1, 2, , ]
         ↑
Invalid expression. When calling a function or indexing a variable, use
parentheses.
Otherwise, check for mismatched delimiters.
 

>> [1, , 2]
  [1, , 2]
      ↑
Invalid expression. When calling a function or indexing a variable, use
parentheses.
Otherwise, check for mismatched delimiters.
 

>> [1; ; 2]
ans =
     1
     2
>> [1, ; , 2]
ans =
     1
     2
>> [1, ; , ; 2]
ans =
     1
     2
>> [1, ; , ; , 2]
ans =
     1
     2
>> [1; , , ; 2]

  [1; , , ; 2]
        ↑
Invalid expression. When calling a function or indexing a variable, use
parentheses.
Otherwise, check for mismatched delimiters.


Everything is correct except when there are two commas next to one another.
It's exactly the same as in Octave.


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