Function check_function_body_class_constructor 

fn check_function_body_class_constructor<'db>(
    db: &'db dyn Db,
    function: SymFunction<'db>,
    sym_class: SymAggregate<'db>,
    ast_class_item: AstAggregate<'db>,
) -> SymExpr<'db>

Check the automatic construct that results when user writes parentheses, like class Foo(...).