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_middle/src/mir/mod.rs
+++ b/compiler/rustc_middle/src/mir/mod.rs
@@ -1929,12 +1929,10 @@ impl BorrowKind {
        }
    }

-    pub fn describe_mutability(&self) -> String {
+    pub fn describe_mutability(&self) -> &str {
        match *self {
-            BorrowKind::Shared | BorrowKind::Shallow | BorrowKind::Unique => {
-                "immutable".to_string()
-            }
-            BorrowKind::Mut { .. } => "mutable".to_string(),
+            BorrowKind::Shared | BorrowKind::Shallow | BorrowKind::Unique => "immutable",
+            BorrowKind::Mut { .. } => "mutable",
        }
    }
 }