pub fn new() -> Env {
        Env {
            solutions: Vec::new(),
        }
    }
/// Create a new, empty environment.
Create a new, empty environment.
Create a new empty environment .
pub fn new() -> Env {
        Env {
            solutions: Vec::new(),
        }
    }
pub fn new ( ) -> Env { Env { solutions : Vec :: new ( ) , } }
Create a new, empty environment.
Create a new empty environment .