Static UNREACHABLE_CFG_SELECT_PREDICATES 

pub static UNREACHABLE_CFG_SELECT_PREDICATES: &'static Lint

The unreachable_cfg_select_predicates lint detects unreachable configuration predicates in the cfg_select! macro.

Example

cfg_select! {
    _ => (),
    windows => (),
}

{{produces}}

Explanation

This usually indicates a mistake in how the predicates are specified or ordered. In this example, the _ predicate will always match, so the windows is impossible to reach. Remember, arms match in order, you probably wanted to put the windows case above the _ case.