Macro which 

macro_rules! which {
    ($condition:expr, $a:expr, $b:expr) => { ... };
    ($condition:expr, $a:expr, $b:expr, stream = $stream:expr) => { ... };
}

👎Deprecated since 0.26.0:

use with_stream or with_device around select

Macro generated for the function crate::ops::which. See the function documentation for more details.