From aa0290bbfc8b7dbd1753b8a6113df17fc836a532 Mon Sep 17 00:00:00 2001
From: Dimitris Fasarakis Hilliard <d.f.hilliard@gmail.com>
Date: Sun, 29 Jan 2023 19:53:00 +0200
Subject: [PATCH] Match on ascii start/continuation characters before calling
 functions.

---
 parser/src/lexer.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/parser/src/lexer.rs b/parser/src/lexer.rs
index 1c124f6..981115d 100644
--- a/parser/src/lexer.rs
+++ b/parser/src/lexer.rs
@@ -534,12 +534,15 @@ where
     }
 
     fn is_identifier_start(&self, c: char) -> bool {
-        c == '_' || is_xid_start(c)
+        match c {
+            'a'..='z' | 'A'..='Z' | '_' => true,
+            _ => is_xid_start(c),
+        }
     }
 
     fn is_identifier_continuation(&self) -> bool {
         match self.window[0] {
-            Some('_' | '0'..='9') => true,
+            Some('a'..='z' | 'A'..='Z' | '_' | '0'..='9') => true,
             Some(c) => is_xid_continue(c),
             _ => false,
         }