Struct UnimplementedValue 

pub struct UnimplementedValue {
    pub option: &'static str,
    pub value: &'static str,
    pub feature: &'static str,
    pub advice: &'static str,
}

One registered value of a string option that pounce does not implement, even though the option itself is read and other values of it work.

UNIMPLEMENTED_FEATURES refuses a whole option; this refuses one mode of one. The registry keeps upstream’s full value list so an ipopt.opt written for Ipopt still parses — but a value that parses and then quietly behaves as a different mode is the same lie the module docstring is about, one level down.

Fields

option: &'static str

The option’s registered name.

value: &'static str

The value pounce does not implement.

feature: &'static str

What that value would mean, named in the error.

advice: &'static str

What the caller can do instead. Empty when there is nothing.