maraiah: add backtrace macro

maraiah/err.rs

@@ -32,6 +32,15 @@ macro_rules! bail {
    };
 }
 
+#[macro_export]
+macro_rules! backtrace {
+   ($e:expr) => {
+      if cfg!(debug_assertions) {
+         dbg!($e.backtrace());
+      }
+   }
+}
+
 /// Returns an `Error` with a static string.
 ///
 /// # Examples