Function build 

pub fn build<'a, C, L>(
    language: &L,
    diagnostics: &mut TemplateDiagnostics,
    node: &ExpressionNode<'_>,
) -> TemplateParseResult<TemplateRenderer<'a, C>>
where
    C: Clone + 'a,
    L: TemplateLanguage<'a> + ?Sized,
    L::Property: WrapTemplateProperty<'a, C>,

Builds template evaluation tree from AST nodes, with fresh build context.