Auto merge of rust-lang#140188 - nnethercote:streamline-format-macro, r=cuviper

bors · bors · commit 89bc2d6446a9 · 2025-04-30T04:04:21.000Z
Streamline the `format` macro.

Removing the unnecessary local variable speeds up compilation a little.

r? `@cuviper`
diff --git a/alloc/src/macros.rs b/alloc/src/macros.rs
@@ -105,8 +105,7 @@ macro_rules! vec {
 macro_rules! format {
     ($($arg:tt)*) => {
         $crate::__export::must_use({
-            let res = $crate::fmt::format($crate::__export::format_args!($($arg)*));
-            res
+            $crate::fmt::format($crate::__export::format_args!($($arg)*))
         })
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -105,8 +105,7 @@ macro_rules! vec {`
`105`	`105`	`macro_rules! format {`
`106`	`106`	`($($arg:tt)*) => {`
`107`	`107`	`$crate::__export::must_use({`
`108`		`- let res = $crate::fmt::format($crate::__export::format_args!($($arg)*));`
`109`		`- res`
	`108`	`+ $crate::fmt::format($crate::__export::format_args!($($arg)*))`
`110`	`109`	`})`
`111`	`110`	`}`
`112`	`111`	`}`