diff --git a/src/rstd/collections/stack.rs b/src/rstd/collections/stack.rs
index 27e859b..61f536b 100644
--- a/src/rstd/collections/stack.rs
+++ b/src/rstd/collections/stack.rs
@@ -75,13 +75,25 @@ impl<ElementParseError: Error> Display for StackParseError<ElementParseError> {
 
 impl<ElementParseError: Error> Error for StackParseError<ElementParseError> {}
 
+impl<F> StackNodeFactory<F> {
+    fn parse_point<'a, Ctx: Context<'a>, I: InCtx<'a, Ctx>>(
+        &self,
+        inctx: I,
+    ) -> IParseResult<'a, Ctx, NullableFactory<Self>, I>
+    where
+        F: Factory<'a, Ctx>,
+    {
+        NullableFactory::new(self.clone()).ideserialize(inctx)
+    }
+}
+
 impl<'a, Ctx: Context<'a>, F: Factory<'a, Ctx>> Factory<'a, Ctx> for StackNodeFactory<F> {
     type Mtbl = StackNode<'a, Ctx, F::Mtbl>;
 
     type ParseError = StackParseError<ParseError<'a, Ctx, F>>;
 
     fn deserialize(&self, inctx: impl InCtx<'a, Ctx>) -> ParseResult<'a, Ctx, Self> {
-        let (rest, inctx) = NullableFactory::new(self.clone()).ideserialize(inctx)?;
+        let (rest, inctx) = self.parse_point(inctx)?;
         let element = self
             .element_factory
             .deserialize(inctx)
@@ -173,7 +185,7 @@ impl<'a, Ctx: Context<'a>, F: InlineableFactory<'a, Ctx>> InlineableFactory<'a,
     }
 
     fn ideserialize<I: InCtx<'a, Ctx>>(&self, inctx: I) -> IParseResult<'a, Ctx, Self, I> {
-        let (rest, inctx) = NullableFactory::new(self.clone()).ideserialize(inctx)?;
+        let (rest, inctx) = self.parse_point(inctx)?;
         let (element, inctx) = self
             .element_factory
             .ideserialize(inctx)