[Octave-bug-tracker] [bug #54698] Precedence of call/indexing operator over transpose operator

[anonymous]

Follow-up Comment #27, bug #54698 (project octave):

As in comment 18 <https://savannah.gnu.org/bugs/index.php?54698#comment18> I
also used the language Prolog (Ciao version) to verify the precedence rules. I
defined two postfix operators "pr" ,that means (),and "tr" that means ' and
"pr" had higher precedence.

I tested different combination of expressions:


:- op(500, yf, pr).
:- op(502, yf, tr).
?-display(x pr pr).
?-nl .
?-display(x tr tr).
?-nl .
?-display(x pr tr).
?-nl .
?-display(x tr pr).


It evaluates three first expressions as:


pr(pr(x))
tr(tr(x))
tr(pr(x))


And for the forth expression it generates error.
You can Try it online!
<https://tio.run/##KyjKz8lP103OTMz//99KVyG/QMPUwEBHoTJNR6GgSFOPCyZmBBErAYlx2eumZBYX5CRWalQAVUEU2uvm5SjooUiVFEHUY5EqwC1VAjWQ6/9/AA>

It verifies the previous experiment that a postfix operator cannot be followed
by a postfix operator of lower precedence.

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