Adjust whitespaces

Author: moatom

library/proc_macro/src/quote.rs

@@ -488,6 +488,12 @@ fn consume_dollar_group(
 
                                 if !is_sep_confirmed {
                                     sep_cand.pop();
+                                    if let Some(TokenTree::Punct(ref p)) = sep_cand.pop() {
+                                        let mut new_p = Punct::new(p.as_char(), Spacing::Alone);
+                                        new_p.set_span(p.span());
+                                        sep_cand.push(TokenTree::Punct(new_p));
+                                    }
+
                                     is_sep_confirmed = true;
                                     break;
                                 }