Implement the new partial type in the renderer.

src/parser/mod.rs

@@ -8,6 +8,7 @@ pub use parser::DustTag;
 pub use parser::Filter;
 pub use parser::KVPair;
 pub use parser::OwnedLiteral;
+pub use parser::PartialNameElement;
 pub use parser::RValue;
 pub use parser::Special;
 pub use parser::Template;