parser: production `params` is nullable

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/src/parser/nit.sablecc3xx b/src/parser/nit.sablecc3xx
index 793fabc..9b98e30 100644 (file)
--- a/src/parser/nit.sablecc3xx
+++ b/src/parser/nit.sablecc3xx
@@ -320,14 +320,15 @@ methid {-> methid}
        ;
 
 signature~withret {-> signature}
-       = opar no params? cpar typing [no2]:no {-> New signature(opar, [params.param], cpar, typing.type)}
-!withret| {noret} opar no params? cpar [no2]:no {-> New signature(opar, [params.param], cpar, Null)}
+       = opar no params cpar typing [no2]:no {-> New signature(opar, [params.param], cpar, typing.type)}
+!withret| {noret} opar no params cpar [no2]:no {-> New signature(opar, [params.param], cpar, Null)}
        | {nopar} typing no {-> New signature(Null, [], Null, typing.type)}
 !withret| {noparnoret} no {-> New signature(Null, [], Null, Null)}
        ;
 
 params {-> param*} 
        = param params_tail* [n2]:no {-> [param, params_tail.param] }
+       | {null} {-> []}
        ;
 params_tail {-> param}
        = comma no param {-> param};