add assignment ops

1 files changed, 11 insertions, 5 deletions

diff --git a/src/vm.rs b/src/vm.rs
index fd8eb73..6ff7b65 100644
--- a/src/vm.rs
+++ b/src/vm.rs
@@ -159,17 +159,23 @@ impl VM {
                 self.pop();
             }
 
-            Op::Yield => {
-                self.frame_mut().ip += 1;
-                return Ok(OpResult::Yield);
-            }
-
             Op::PopUpvalue => {
                 let value = self.pop();
                 let slot = self.stack.len();
                 self.drop_upvalue(slot, value);
             }
 
+            Op::Copy => {
+                let v = self.pop();
+                self.push(v.clone());
+                self.push(v);
+            }
+
+            Op::Yield => {
+                self.frame_mut().ip += 1;
+                return Ok(OpResult::Yield);
+            }
+
             Op::Constant(value) => {
                 let offset = self.frame().stack_offset;
                 let value = match value {