Implement on_err!

Author: jellyterra

Cargo.toml

@@ -2,7 +2,3 @@
 name = "err-rs"
 version = "0.1.0"
 edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]

src/lib.rs

@@ -1,6 +1,5 @@
-// Copyright 2024 LangVM Project
-// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0
-// that can be found in the LICENSE file and https://mozilla.org/MPL/2.0/.
+// Copyright 2024 Jelly Terra
+// Use of this source code form is governed under the MIT license.
 
 #[macro_export]
 macro_rules! err {
@@ -23,8 +22,18 @@ macro_rules! ok {
 macro_rules! wrap_result {
     ($tag:expr, $expr:expr) => {
         match $expr {
-            Ok(v) => { v }
-            Err(e) => { return Err($tag(e)); }
+            Ok(v) => v,
+            Err(e) => err!($tag, e)
+        }
+    };
+}
+
+#[macro_export]
+macro_rules! on_err {
+    ($expr:expr, $err_name:ident => $err_handle:expr) => {
+        match $expr {
+            Ok(v) => v,
+            Err($err_name) => $err_handle
         }
     };
 }