Function render_modules_to 

pub fn render_modules_to<W: Write>(
    engine: &Tera,
    modules: Vec<&Module>,
    context: Option<Context>,
    template_name: &str,
    w: &mut W,
) -> Result<(), Error>

Render the set of modules, with the template in the file template_name, and using engine. If context is not specified a new blank object is created, and in either case a map is created under the key "modules" as a map from module name to module representation.

{
    "modules": {
        "Identifier": {},
    }
}

In the case of this function the template is rendered to the write implementation w.