fix #11596, showing x{(inert y)} in syntax error

Author: JeffBezanson

src/julia-syntax.scm

@@ -59,7 +59,10 @@
                 ((call)   (string (deparse (cadr e)) #\( (deparse-arglist (cddr e)) #\)))
                 ((ref)    (string (deparse (cadr e)) #\[ (deparse-arglist (cddr e)) #\]))
                 ((curly)  (string (deparse (cadr e)) #\{ (deparse-arglist (cddr e)) #\}))
-                ((quote)  (string ":(" (deparse (cadr e)) ")"))
+                ((quote inert)
+		 (if (symbol? (cadr e))
+		     (string ":" (deparse (cadr e)))
+		     (string ":(" (deparse (cadr e)) ")")))
                 ((vcat)   (string #\[ (deparse-arglist (cdr e)) #\]))
                 ((hcat)   (string #\[ (deparse-arglist (cdr e) " ") #\]))
                 ((global local const)