[Octave-bug-tracker] [bug #60882] error parsing command syntax

[Markus Mützel]

Follow-up Comment #36, bug #60882 (project octave):

Matlab and Octave differentiate between command syntax and function syntax
(see section 11.13 of the current manual).
`x ++` is interpreted as command syntax. Thus, it requires that `x` is valid
function identifier. If it is not, an error is emitted.
`y = x ++` cannot be interpreted in command syntax (because of the assignment
which is impossible in command syntax). Thus, it is treated as function
syntax. That means `++` cannot be a function argument (or the user would need
to write `y = x('++')`). Thus, it is treated as an operator.

`x ++ + 3` evaluating to 3 might be a bug. IIUC, it should be evaluated the
same as `x('++', '+', '3')` which should result in an error if `x` is not a
valid function identifier.

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