Simplify assign stack cleanup

core/engine/src/bytecompiler/expression/assign.rs

@@ -280,21 +280,14 @@ impl ByteCompiler<'_> {
             }
 
             if let Some(early_exit) = early_exit {
-                if pop_count == 0 {
-                    self.patch_jump(early_exit);
-                    self.push_from_register(&lhs);
-                } else {
-                    let exit = self.emit_opcode_with_operand(Opcode::Jump);
-
-                    self.patch_jump(early_exit);
-                    self.push_from_register(&lhs);
-
-                    for _ in 0..pop_count {
-                        self.emit_opcode(Opcode::Swap);
-                        self.emit_opcode(Opcode::Pop);
-                    }
-                    self.patch_jump(exit);
+                let exit = self.emit_opcode_with_operand(Opcode::Jump);
+
+                self.patch_jump(early_exit);
+                for _ in 0..pop_count {
+                    self.emit_opcode(Opcode::Pop);
                 }
+                self.push_from_register(&lhs);
+                self.patch_jump(exit);
             }
 
             self.register_allocator.dealloc(lhs);

core/engine/src/bytecompiler/register.rs

@@ -37,7 +37,7 @@ impl Reg {
 impl Drop for Reg {
     fn drop(&mut self) {
         if !self.flags.is_persistent() {
-            unreachable!("forgot to deallocate a register!")
+            unreachable!("forgot to deallocate a register! Or a panic happend which caused Reg's drop to be called after the panic!")
         }
     }
 }