Put incremental compilation behind feature

1 files changed, 4 insertions, 2 deletions

diff --git a/src/layout/stack.rs b/src/layout/stack.rs
index fa5fd584..d8e30b2a 100644
--- a/src/layout/stack.rs
+++ b/src/layout/stack.rs
@@ -3,7 +3,8 @@ use decorum::N64;
 use super::*;
 
 /// A node that stacks its children.
-#[derive(Debug, Clone, PartialEq, Hash)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "layout-cache", derive(Hash))]
 pub struct StackNode {
     /// The `main` and `cross` directions of this stack.
     ///
@@ -19,7 +20,8 @@ pub struct StackNode {
 }
 
 /// A child of a stack node.
-#[derive(Debug, Clone, PartialEq, Hash)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "layout-cache", derive(Hash))]
 pub enum StackChild {
     /// Spacing between other nodes.
     Spacing(Length),