Auto merge of #89139 - camsteffen:write-perf, r=Mark-Simulacrum

Use ZST for fmt unsafety as suggested here - https://github.com/rust-lang/rust/pull/83302#issuecomment-923529151.
2021-09-23 02:10:26 +00:00 · 2021-09-23 02:10:26 +00:00 · 67365d64bc
commit 67365d64bc
parent 30278d3cf9 2efa9d7969
9 changed files with 111 additions and 103 deletions
--- a/src/test/ui/attributes/key-value-expansion.stderr
+++ b/src/test/ui/attributes/key-value-expansion.stderr
@ -17,16 +17,12 @@ LL | bug!();

 error: unexpected token: `{
    let res =
-        ::alloc::fmt::format(match match (&"u8",) {
-                                       (arg0,) =>
-                                       [::core::fmt::ArgumentV1::new(arg0,
-                                                                     ::core::fmt::Display::fmt)],
-                                   } {
-                                 ref args => unsafe {
-                                     ::core::fmt::Arguments::new_v1(&[""],
-                                                                    args)
-                                 }
-                             });
+        ::alloc::fmt::format(::core::fmt::Arguments::new_v1(&[""],
+                                                            &match (&"u8",) {
+                                                                 (arg0,) =>
+                                                                 [::core::fmt::ArgumentV1::new(arg0,
+                                                                                               ::core::fmt::Display::fmt)],
+                                                             }));
    res
 }.as_str()`
  --> $DIR/key-value-expansion.rs:48:23