Rollup merge of #115596 - nnethercote:two-small-changes, r=lqd

A small change

A small change I made while poking around the code.

r? `@lqd`

Author: matthiaskrgr

compiler/rustc_parse/src/parser/attr_wrapper.rs

@@ -106,7 +106,7 @@ impl ToAttrTokenStream for LazyAttrTokenStreamImpl {
         let mut cursor_snapshot = self.cursor_snapshot.clone();
         let tokens =
             std::iter::once((FlatToken::Token(self.start_token.0.clone()), self.start_token.1))
-                .chain((0..self.num_calls).map(|_| {
+                .chain(std::iter::repeat_with(|| {
                     let token = cursor_snapshot.next();
                     (FlatToken::Token(token.0), token.1)
                 }))