fix Pattern Tuple issue, add to much ( and )

flap/src/hopix/hopixParser.mly

@@ -167,9 +167,14 @@ simple_pattern:
     PWildcard
   }
 /* N-uplets ou parenthésage */
-| LPAREN p=optionlist(separated_nonempty_list(COMMA, located(pattern))) RPAREN {
-    PTuple(p)
+| LPAREN RPAREN {
+  PTuple([])
 }
+| l=pattern_list {
+  match l with | [alone] -> Position.value alone | _ -> PTuple(l)
+}
+
+
 /* Annotation de type */
 | p=located(simple_pattern) COLON ty=located(ty) {
     PTypeAnnotation(p, ty)