diff --git a/rrust-macro/src/reverse.rs b/rrust-macro/src/reverse.rs
index bc950f8..db875ab 100644
--- a/rrust-macro/src/reverse.rs
+++ b/rrust-macro/src/reverse.rs
@@ -1,6 +1,6 @@
 use proc_macro2::TokenStream;
 use quote::ToTokens;
-use syn::{fold::Fold, parse::Parser, ExprBinary, StmtMacro};
+use syn::{fold::Fold, parse::Parser, ExprBinary, ExprMethodCall, StmtMacro};
 
 use crate::utils::{delocal_ident_stmt, local_ident};
 
@@ -278,7 +278,29 @@ fn reverse_expr(e: Expr) -> Expr {
             }
         }
         Expr::Match(_) => panic!("Not yet implemented {}", line!()),
-        Expr::MethodCall(_) => panic!("Not yet implemented {}", line!()),
+        Expr::MethodCall(ExprMethodCall {
+            attrs,
+            receiver,
+            dot_token,
+            method,
+            turbofish,
+            paren_token,
+            args,
+        }) => {
+            //std::slice::swap
+            if method.to_string() == "swap" {
+                return Expr::MethodCall(ExprMethodCall {
+                    attrs,
+                    receiver,
+                    dot_token,
+                    method,
+                    turbofish,
+                    paren_token,
+                    args,
+                });
+            }
+            panic!("Not yet implemented {}", line!())
+        }
         Expr::Paren(_) => panic!("Not yet implemented {}", line!()),
         Expr::Path(_) => panic!("Not yet implemented {}", line!()),
         Expr::Range(_) => panic!("Not yet implemented {}", line!()),
diff --git a/rrust/src/lib.rs b/rrust/src/lib.rs
index 1fc1fa5..2e9d60c 100644
--- a/rrust/src/lib.rs
+++ b/rrust/src/lib.rs
@@ -425,7 +425,7 @@ pub use rrust_macro::{forward, reverse};
 macro_rules! delocal {
     ($name:ident, $e:expr) => {
         if $name != $e {
-            panic!("Delocal failed {} != {}", $name, $e);
+            panic!("Delocal failed {:?} != {:?}", $name, $e);
         }
         drop($name);
     };