pub fn is_false(&self) -> bool {
        match self {
            _0 => true,
            Un(a) | Nu(a) => a.is_false(),
            _ => false,
        }
    }
/// Returns `false` if the expression is a falsish expression, `false` otherwise.
Returns `false` if the expression is a falsish expression, `false` otherwise.
Returns ` false ` if the expression is a falsish expression ` false ` otherwise .
pub fn is_false(&self) -> bool {
        match self {
            _0 => true,
            Un(a) | Nu(a) => a.is_false(),
            _ => false,
        }
    }
pub fn is_false ( & self ) -> bool { match self { _0 => true , Un ( a ) | Nu ( a ) => a . is_false ( ) , _ => false , } }
Returns `false` if the expression is a falsish expression, `false` otherwise.
Returns ` false ` if the expression is a falsish expression ` false ` otherwise .
&self
&self