Syntax highlighting of RuleDelayed involving Orderless symbols

Asked Mar 04 '15 at 12:45

Active Mar 04 '15 at 13:25

Viewed 63 times

I am using version 10.0.2

If I set

SetAttributes[ol, Orderless]

Then the following expression appears to be highlighted incorrectly after clicking in it (no need to evaluate it)

ol[a_, b_] :> {a, b} (*click in this expression*)

Of course replacements like this still work

ol[1, 2] /. ol[a_, b_] :> {a, b}

{1, 2}

Am I correct in concluding that this is a (small) bug?

Edit: I tested this several times with a fresh kernel, but with a fresh front end the bug does not occur. I will try to see what steps I took to get the front end in this state.

Edit2

Can somebody please evaluate the following code in one cell and then manually type a space, to see if they get the same incorrect highlighting?

SetAttributes[ol, Orderless]
Cell[BoxData@
    RowBox@{
       RowBox@{"ol", "[", 
          RowBox@{"a_", ",", "b_"}, "]"
       }
     , 
     "\[RuleDelayed]"
     , 
       RowBox@{"{", 
          RowBox@{"a", ",", "b"}, "}"
       }
     }, 
  "Input"
  ] // CellPrint

SelectionMove[EvaluationNotebook[], Before, CellContents]
SelectionMove[EvaluationNotebook[], Next, Character, 11]

edited Mar 04 '15 at 13:25

asked Mar 04 '15 at 12:45

Jacob Akkerboom

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Heya @Kuba :). Em, well the a in the list was blue for me. But not after restarting the front end. – Jacob Akkerboom Mar 04 '15 at 13:00
@Kuba Now only the b is blue for me :P. – Jacob Akkerboom Mar 04 '15 at 13:03
It looks fine in Win7 V10.0.2 :) – Kuba Mar 04 '15 at 13:04
@Kuba how about now? Remember to manually type a space! – Jacob Akkerboom Mar 04 '15 at 13:25
Nice example but sorry, all fine. To cheer you up, from time to time brackets matching hinglighting stays on a screen for me. Don't know how to reproduce that at demand though. – Kuba Mar 04 '15 at 13:28
@Kuba okidokie, maybe it is something mac specific then. It was pretty minor anyway :). We will have to find some other way to honor mr Fultz :P. – Jacob Akkerboom Mar 04 '15 at 13:37
With the CellPrint code if I press space the b turns blue. Backspace makes it green again, but as soon as I click somewhere else it's back to blue again. This is in 10.1.0 under Windows. – Mr.Wizard Jul 31 '15 at 23:54

Syntax highlighting of RuleDelayed involving Orderless symbols

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