Add proper impl for templating

Signed-off-by: Marcel Müller <neikos@neikos.email>

src/emit/mod.rs

@@ -122,7 +122,7 @@ mod tests {
     fn check_simple_variable_interpolation() {
         let input = "Hello {{= world }}";
 
-        let parsed = crate::parser::parse(input).unwrap();
+        let parsed = crate::parser::parse(input.into()).unwrap();
 
         let ast = crate::ast::parse(parsed.tokens()).unwrap();