Starting an IntoContextElement trait to allow for delayed evaluation.

src/renderer/context_element.rs

@@ -12,6 +12,7 @@ pub trait ContextElement:
     + Loopable
     + CloneIntoBoxedContextElement
     + CompareContextElement
+    + FromContextElement
 {
 }
 
@@ -86,3 +87,23 @@ impl<'a, 'b> PartialOrd<&'b dyn ContextElement> for &'a dyn ContextElement {
         self.partial_compare(*other)
     }
 }
+
+pub trait FromContextElement {
+    fn from_context_element(&self) -> &dyn IntoContextElement;
+}
+
+impl<C: ContextElement> FromContextElement for C {
+    fn from_context_element(&self) -> &dyn IntoContextElement {
+        self
+    }
+}
+
+pub trait IntoContextElement {
+    fn into_context_element(&self) -> &dyn ContextElement;
+}
+
+impl<C: ContextElement> IntoContextElement for C {
+    fn into_context_element(&self) -> &dyn ContextElement {
+        self
+    }
+}