From 4bd72c7c375971af4411480bd4c08ee53a21dc5e Mon Sep 17 00:00:00 2001
From: Trevor Gross <tmgross@umich.edu>
Date: Tue, 19 Aug 2025 19:26:19 +0000
Subject: [PATCH] Revert "Remove `@__identity` rule."

This change created a regression.

This reverts commit 4d7a585e4d033280d3610c95aa0ea178444a3ff1.

Closes: https://github.com/rust-lang/cfg-if/issues/90
---
 src/lib.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 6bf5970..280af61 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -82,7 +82,7 @@ macro_rules! cfg_if {
             $( $yes , )?
             not(any( $( $no ),* ))
         ))]
-        $( $tokens )*
+        $crate::cfg_if! { @__identity $( $tokens )* }
 
         // Recurse to emit all other items in `$rest`, and when we do so add all
         // our `$yes` matchers to the list of `$no` matchers as future emissions
@@ -92,6 +92,12 @@ macro_rules! cfg_if {
             $( $rest , )*
         }
     };
+
+    // Internal macro to make __apply work out right for different match types,
+    // because of how macros match/expand stuff.
+    (@__identity $( $tokens:tt )* ) => {
+        $( $tokens )*
+    };
 }
 
 #[cfg(test)]