--- a/src/Pure/Syntax/mixfix.ML Fri May 25 21:00:47 2018 +0200
+++ b/src/Pure/Syntax/mixfix.ML Fri May 25 21:01:51 2018 +0200
@@ -97,12 +97,18 @@
fun pretty_mixfix NoSyn = Pretty.str ""
| pretty_mixfix (Mixfix (s, ps, p, _)) =
- parens (Pretty.breaks [quoted s, brackets (Pretty.commas (map int ps)), int p])
+ parens
+ (Pretty.breaks
+ (quoted s ::
+ (if null ps then [] else [brackets (Pretty.commas (map int ps))]) @
+ (if p = 1000 then [] else [int p])))
| pretty_mixfix (Infix (s, p, _)) = parens (Pretty.breaks [keyword "infix", quoted s, int p])
| pretty_mixfix (Infixl (s, p, _)) = parens (Pretty.breaks [keyword "infixl", quoted s, int p])
| pretty_mixfix (Infixr (s, p, _)) = parens (Pretty.breaks [keyword "infixr", quoted s, int p])
| pretty_mixfix (Binder (s, p1, p2, _)) =
- parens (Pretty.breaks [keyword "binder", quoted s, brackets [int p1], int p2])
+ parens
+ (Pretty.breaks
+ ([keyword "binder", quoted s] @ (if p1 = p2 then [] else [brackets [int p1]]) @ [int p2]))
| pretty_mixfix (Structure _) = parens [keyword "structure"];
end;