diff --git a/src/rstd/collections/stack.rs b/src/rstd/collections/stack.rs
index 8077776..9fc1f70 100644
--- a/src/rstd/collections/stack.rs
+++ b/src/rstd/collections/stack.rs
@@ -106,7 +106,7 @@ impl<F: ParseMode> ImplMode for StackNodeFactory<F> {
     type Mode = F::Mode;
 }
 
-impl<'a, Ctx: Context<'a>, F: ImplMode + RegularFactory<'a, Ctx>> RegularFactory<'a, Ctx>
+impl<'a, Ctx: Context<'a>, F: Factory<'a, Ctx> + RegularFactory<'a, Ctx>> RegularFactory<'a, Ctx>
     for StackNodeFactory<F>
 where
     F::Mtbl: MentionableTop<'a, Ctx>,
@@ -205,7 +205,7 @@ where
     }
 }
 
-impl<'a, Ctx: Context<'a>, F: ImplMode + InliningFactory<'a, Ctx>> InliningFactory<'a, Ctx>
+impl<'a, Ctx: Context<'a>, F: Factory<'a, Ctx> + InliningFactory<'a, Ctx>> InliningFactory<'a, Ctx>
     for StackNodeFactory<F>
 where
     F::Mtbl: MentionableTop<'a, Ctx>,
@@ -224,8 +224,8 @@ where
     }
 }
 
-impl<'a, Ctx: Context<'a>, F: ImplMode + FixedSizeFactory<'a, Ctx>> FixedSizeFactory<'a, Ctx>
-    for StackNodeFactory<F>
+impl<'a, Ctx: Context<'a>, F: Factory<'a, Ctx> + FixedSizeFactory<'a, Ctx>>
+    FixedSizeFactory<'a, Ctx> for StackNodeFactory<F>
 where
     F::Mtbl: MentionableTop<'a, Ctx>,
 {
@@ -234,8 +234,8 @@ where
     }
 }
 
-impl<'a, Ctx: Context<'a>, F: ImplMode + ConstSizeFactory<'a, Ctx>> ConstSizeFactory<'a, Ctx>
-    for StackNodeFactory<F>
+impl<'a, Ctx: Context<'a>, F: Factory<'a, Ctx> + ConstSizeFactory<'a, Ctx>>
+    ConstSizeFactory<'a, Ctx> for StackNodeFactory<F>
 where
     F::Mtbl: MentionableTop<'a, Ctx>,
 {