implement unary operations

fix-vm/src/instructions/arithmetic.rs

@@ -196,13 +196,20 @@ impl<'gc> crate::Vm<'gc> {
     }
 
     #[inline(always)]
-    pub(crate) fn op_neg(&mut self) -> Step {
-        todo!("implement unary operation");
+    pub(crate) fn op_neg(&mut self, reader: &mut BytecodeReader<'_>, mc: &Mutation<'gc>) -> Step {
+        let rhs = self.try_force::<NixNum>(reader, mc)?;
+        match rhs {
+            NixNum::Int(int) => self.push(Value::make_int(-int, mc)),
+            NixNum::Float(float) => self.push(Value::new_float(-float)),
+        }
+        Step::Continue(())
     }
 
     #[inline(always)]
-    pub(crate) fn op_not(&mut self) -> Step {
-        todo!("implement unary operation");
+    pub(crate) fn op_not(&mut self, reader: &mut BytecodeReader<'_>, mc: &Mutation<'gc>) -> Step {
+        let rhs = self.try_force::<bool>(reader, mc)?;
+        self.push(Value::new_inline(!rhs));
+        Step::Continue(())
     }
 
     pub(crate) fn values_equal(