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

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Follow-up Comment #1, bug #68101 (group octave):

This patch fixes bug #68101 where a missing output in a multi-assignment list
(e.g. [, order] = sort(...)) was incorrectly accepted instead of producing an
error.

The parser now rejects leading comma forms in cell_or_matrix_row when parsing
an assignment LHS by checking lexer.m_looking_at_matrix_or_assign_lhs.

[~, order] = ... continues to work correctly.

A regression test has been added in test/bug-68101.tst.

Please let me know if any changes are required.

(file #58288)

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Name: 0001-Fix-parser-reject-missing-outputs-in-multi-assignmen.patch Size:
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<https://file.savannah.gnu.org/file/0001-Fix-parser-reject-missing-outputs-in-multi-assignmen.patch?file_id=58288>


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