Compiling.

Need to see if I can do a generic implemented of IntoBoxedContextElement for all objects implementing Copy, and I need to implement the compare code to make sure this all works before I start integrating this more.

src/bin.rs

@@ -1,5 +1,6 @@
 extern crate nom;
 
+use crate::renderer::IntoBoxedContextElement;
 use parser::Filter;
 use renderer::compile_template;
 use renderer::CompiledTemplate;
@@ -137,3 +138,9 @@ impl Loopable for serde_json::Value {
         }
     }
 }
+
+impl IntoBoxedContextElement for serde_json::Value {
+    fn clone_to_box(&self) -> Box<dyn ContextElement> {
+        Box::new(self.clone())
+    }
+}

src/renderer/context_element.rs

@@ -35,13 +35,7 @@ pub trait CompareContextElement {
 }
 
 pub trait IntoBoxedContextElement {
-    fn to_box(self) -> Box<dyn ContextElement>;
-}
-
-impl<C: 'static + ContextElement> IntoBoxedContextElement for C {
-    fn to_box(self) -> Box<dyn ContextElement> {
-        Box::new(self)
-    }
+    fn clone_to_box(&self) -> Box<dyn ContextElement>;
 }
 
 // impl PartialEq<dyn ContextElement> for dyn ContextElement {

src/renderer/mod.rs

@@ -8,6 +8,7 @@ mod renderer;
 mod walking;
 
 pub use context_element::ContextElement;
+pub use context_element::IntoBoxedContextElement;
 pub use context_element::Loopable;
 pub use context_element::Renderable;
 pub use context_element::Walkable;

src/renderer/parameters_context.rs

@@ -55,22 +55,12 @@ impl NewParametersContext {
             .iter()
             .map(|kvpair| (kvpair.key.to_string(), OwnedRValue::from(&kvpair.value)))
             .collect();
-
-        let x: String = "foo".to_owned();
-        let y: &dyn ContextElement = &x as _;
-        let z: Box<dyn ContextElement> = y.clone().to_box();
-        // let owned_y: Box<dyn ContextElement> = Box::new(*y.clone());
-        // unsafe {
-        //     let ce = &mut *y.clone() as *mut dyn ContextElement;
-        //     Box::from_raw(ce);
-        // }
-
-        // let owned_breadcrumbs: Vec<Box<dyn ContextElement>> =
-        //     breadcrumbs.iter().map(|ce| Box::new(*ce.clone())).collect();
+        let owned_breadcrumbs: Vec<Box<dyn ContextElement>> =
+            breadcrumbs.iter().map(|ce| ce.clone_to_box()).collect();
 
         NewParametersContext {
             params: owned_params,
-            breadcrumbs: Vec::new(),
+            breadcrumbs: owned_breadcrumbs,
         }
     }
 }
@@ -150,3 +140,9 @@ impl Walkable for String {
         Err(WalkError::CantWalk)
     }
 }
+
+impl IntoBoxedContextElement for String {
+    fn clone_to_box(&self) -> Box<dyn ContextElement> {
+        Box::new(self.clone())
+    }
+}