Move raw_identifiers check to the lexer.

src/libsyntax/parse/lexer/mod.rs

@@ -1155,6 +1155,10 @@ impl<'a> StringReader<'a> {
                             &format!("`r#{}` is not currently supported.", ident.name)
                         ).raise();
                     }
+                    if is_raw_ident {
+                        let span = self.mk_sp(raw_start, self.pos);
+                        self.sess.raw_identifier_spans.borrow_mut().push(span);
+                    }
                     token::Ident(ident, is_raw_ident)
                 }));
             }

src/libsyntax/parse/parser.rs

@@ -784,7 +784,7 @@ impl<'a> Parser<'a> {
 
     fn parse_ident_common(&mut self, recover: bool) -> PResult<'a, ast::Ident> {
         match self.token {
-            token::Ident(i, is_raw) => {
+            token::Ident(i, _) => {
                 if self.token.is_reserved_ident() {
                     let mut err = self.expected_ident_found();
                     if recover {
@@ -793,9 +793,6 @@ impl<'a> Parser<'a> {
                         return Err(err);
                     }
                 }
-                if is_raw {
-                    self.sess.raw_identifier_spans.borrow_mut().push(self.span);
-                }
                 self.bump();
                 Ok(i)
             }