Represent register taking

valuescript_vm/src/bytecode_decoder.rs

@@ -39,6 +39,7 @@ pub enum BytecodeType {
   Function = 0x0b,
   Pointer = 0x0d,
   Register = 0x0e,
+  TakeRegister = 0x0f,
   Builtin = 0x10,
   Class = 0x11,
   BigInt = 0x13,
@@ -142,6 +143,10 @@ impl BytecodeDecoder {
         Val::Void => Own(Val::Undefined),
         ref val => Ref(val),
       },
+      BytecodeType::TakeRegister => match registers[self.decode_register_index().unwrap()] {
+        Val::Void => Own(Val::Undefined),
+        ref val => Ref(val),
+      },
       BytecodeType::Builtin => Own(BUILTIN_VALS[self.decode_varsize_uint()]()),
       BytecodeType::Class => Own(
         VsClass {