avoid some &str to String conversions

2022-07-10 03:18:56 +09:00
parent fac8fa5672
commit bda83e6543
13 changed files with 23 additions and 34 deletions
--- a/compiler/rustc_span/src/hygiene.rs
+++ b/compiler/rustc_span/src/hygiene.rs
@@ -629,8 +629,7 @@ pub fn debug_hygiene_data(verbose: bool) -> String {
        if verbose {
            format!("{:#?}", data)
        } else {
-            let mut s = String::from("");
-            s.push_str("Expansions:");
+            let mut s = String::from("Expansions:");
            let mut debug_expn_data = |(id, expn_data): (&ExpnId, &ExpnData)| {
                s.push_str(&format!(
                    "\n{:?}: parent: {:?}, call_site_ctxt: {:?}, def_site_ctxt: {:?}, kind: {:?}",