Macro query_ensure_select 

macro_rules! query_ensure_select {
    ([]$($args:tt)*) => { ... };
    ([(return_result_from_ensure_ok) $($rest:tt)*]$($args:tt)*) => { ... };
    ([$other:tt $($modifiers:tt)*]$($args:tt)*) => { ... };
}

Calls either query_ensure or query_ensure_error_guaranteed, depending on whether the list of modifiers contains return_result_from_ensure_ok.