tmp(2)

Signed-off-by: junxiang Mu <1948535941@qq.com>

common/common/src/lib.rs

@@ -1,2 +1,21 @@
 pub mod error;
 pub mod globals;
+
+/// Defers evaluation of a block of code until the end of the scope.
+#[macro_export] macro_rules! defer {
+    ($($body:tt)*) => {
+        let _guard = {
+            pub struct Guard<F: FnOnce()>(Option<F>);
+
+            impl<F: FnOnce()> Drop for Guard<F> {
+                fn drop(&mut self) {
+                    (self.0).take().map(|f| f());
+                }
+            }
+
+            Guard(Some(|| {
+                let _ = { $($body)* };
+            }))
+        };
+    };
+}