Fix typo (use wrong format_args)

Author: richard-uk1

src/rust-2018/macros/macro-changes.md

@@ -244,15 +244,15 @@ macro_rules! __impl_log {
 #[macro_export(local_inner_macros)]
 macro_rules! warn {
     ($($args:tt)*) => {
-        __impl_log!($crate::LogLevel::Warn, format_args!($($args)*))
+        __impl_log!($crate::LogLevel::Warn, _log__format_args!($($args)*))
     }
 }
 
 /// Error level log message
 #[macro_export(local_inner_macros)]
 macro_rules! error {
     ($($args:tt)*) => {
-        __impl_log!($crate::LogLevel::Error, format_args!($($args)*))
+        __impl_log!($crate::LogLevel::Error, _log__format_args!($($args)*))
     }
 }