display _ as left arrow (was Re: Help on sending a UDP Packet)

> The idea of GNU Smalltalk is to use a UNIX command-line style environment,
> and use "Emacs" (editor) and so on ... it's not about emulating the more graphically oriented
> development environment of older Smalltalk implementations.
>
> So by default it is logical that GNU smalltalk limits itself to strict ASCII characters.
>
> Using '_' is just fine as it currently is :
>
> https://www.gnu.org/software/smalltalk/manual/html_node/Syntax.html
>
> in the footnote it describes '_'.

BTW.  Currently `smalltalk-mode` in Emacs can display the `^` and the
`:=` operators as up/left arrows if you activate the `prettify-symbols-mode`.
It'd be trivial to add `_` to that with the patch below.

The downside is that then both `_` and `:=` would be displayed in the
same way.  And since GNU Smalltalk seems to encourage the use of `:=`
over `_`, maybe it's better to keep `_` ugly?


        Stefan


diff --git a/smalltalk-mode.el b/smalltalk-mode.el
index f662fe1d69..768396b71b 100644
--- a/smalltalk-mode.el
+++ b/smalltalk-mode.el
@@ -534,6 +534,7 @@ of the line where the search succeeded.  Otherwise, return nil."
 
 (defvar smalltalk-prettify-symbols-alist
   '(("^" . ?↑)
+    ("_" . ?←)
     (":=" . ?←)))
 
 ;;;; ---[ Interactive functions ]---------------------------------------