Function expect_template_expression

pub fn expect_template_expression<'a, L: TemplateLanguage<'a> + ?Sized>(
    language: &L,
    diagnostics: &mut TemplateDiagnostics,
    build_ctx: &BuildContext<'_, L::Property>,
    node: &ExpressionNode<'_>,
) -> TemplateParseResult<Box<dyn Template + 'a>>