tweak format_args! docs

Swap the variable names in the example.

diff --git a/src/libstd/macros.rs b/src/libstd/macros.rs
index 47609f17221ef5dd9ce17cb07dfaf9e2b4dc2c4a..5ef7c15965505df76be13fe25edf6f41eb2af87e 100644 (file)
--- a/src/libstd/macros.rs
+++ b/src/libstd/macros.rs
@@ -341,8 +341,8 @@ macro_rules! compile_error {
     /// format string in `format_args!`.
     ///
     /// ```rust
-    /// let display = format!("{:?}", format_args!("{} foo {:?}", 1, 2));
-    /// let debug = format!("{}", format_args!("{} foo {:?}", 1, 2));
+    /// let debug = format!("{:?}", format_args!("{} foo {:?}", 1, 2));
+    /// let display = format!("{}", format_args!("{} foo {:?}", 1, 2));
     /// assert_eq!("1 foo 2", display);
     /// assert_eq!(display, debug);
     /// ```