Fix EOF error in parser

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/parser.rs

@@ -457,7 +457,7 @@ impl Parser {
     }
 
     fn is_eof(&self) -> bool {
-        self.lexer.is_eof()
+        self.current.kind == TokenKind::Eof
     }
 
     pub fn was_error(&self) -> bool {