Emit MAKE_CELL and COPY_FREE_VARS before RESUME

Emit MAKE_CELL for each cell variable and COPY_FREE_VARS N for free variables at the start of each code object, before RESUME. These instructions are no-ops in the VM but align the bytecode with CPython 3.14's output.
RustPython · youknowone · Mar 23, 2026 · Mar 20, 2026 · Mar 20, 2026 · Mar 20, 2026
commit f52276ec7902aa9b501a254ceae9feec08f2e7a8
diff --git a/crates/codegen/src/compile.rs b/crates/codegen/src/compile.rs
@@ -1151,7 +1151,16 @@ impl Compiler {
             self.set_qualname();
         }
 
-        // Emit COPY_FREE_VARS and MAKE_CELL prolog before RESUME
+        // Emit MAKE_CELL for each cell variable (before RESUME)
+        {
+            let ncells = self.code_stack.last().unwrap().metadata.cellvars.len();
+            for i in 0..ncells {
+                let i_varnum: oparg::VarNum = u32::try_from(i).expect("too many cellvars").into();
+                emit!(self, Instruction::MakeCell { i: i_varnum });
+            }
+        }
+
+        // Emit COPY_FREE_VARS if there are free variables (before RESUME)
         {
             let nfrees = self.code_stack.last().unwrap().metadata.freevars.len();
             if nfrees > 0 {
@@ -1162,11 +1171,6 @@ impl Compiler {
                     }
                 );
             }
-            let ncells = self.code_stack.last().unwrap().metadata.cellvars.len();
-            for i in 0..ncells {
-                let i_varnum: oparg::VarNum = u32::try_from(i).expect("too many cellvars").into();
-                emit!(self, Instruction::MakeCell { i: i_varnum });
-            }
         }
 
         // Emit RESUME (handles async preamble and module lineno 0)