[parse] Fix validity identifier usage for particular parsing in attributes

If identifier is being parsed via `parse::<>`, use only
`lexer.identifier()` because the `parse::<>` will handle any errors
accordingly. Only when an identifier is directly used, the
`parser.identifier()` must be used.

Signed-off-by: Manas <manas18244@iiitd.ac.in>

Author: weirdsmiley

src/parser.rs

@@ -182,7 +182,7 @@ impl Parser {
 
         while !self.lexer.is_token(Token::CBracket) {
             if self.lexer.is_token(Token::Identifier) {
-                let attr = self.identifier()?.parse::<Attribute>()?;
+                let attr = self.lexer.identifier().parse::<Attribute>()?;
                 attrs.push(attr);
                 self.lexer.consume(Token::Identifier)?;
             }