From 24d2ab8b0adccdc90781293bca5fc00263cf4b6f Mon Sep 17 00:00:00 2001
From: Nick Liu <nicku5011@gmail.com>
Date: Thu, 29 Dec 2022 21:39:57 +0800
Subject: [PATCH] use is_none

---
 parser/python.lalrpop | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/parser/python.lalrpop b/parser/python.lalrpop
index 7683b60..5652be1 100644
--- a/parser/python.lalrpop
+++ b/parser/python.lalrpop
@@ -682,16 +682,16 @@ ParameterListStarArgs<ArgType>: (Option<Box<ast::Arg>>, Vec<ast::Arg>, Vec<ast::
         }
         kwargs.extend(kwonlyargs.into_iter());
 
-        let kwarg = kwarg.map(|n| n.1).flatten();
-        let va = va.map(Box::new);
-
-        if va==None && kwargs.is_empty() && kwarg==None {
+        if va.is_none() && kwargs.is_empty() && kwarg.is_none() {
             Err(LexicalError {
                 error: LexicalErrorType::OtherError("named arguments must follow bare *".to_string()),
                 location: location,
             })?
         }
 
+        let kwarg = kwarg.map(|n| n.1).flatten();
+        let va = va.map(Box::new);
+
         Ok((va, kwargs, kw_defaults, kwarg))
     }
 };