pub fn print_with_prefix(b: &BigInt, prefix: String) {
//@ The syntax for closures is `|arg1, arg2, ...| code`. Notice that the closure can reference variables like `prefix` that it did not
//@ take as argument - variables that happen to be present *outside* of the closure. We say that the closure *captures*
- //@ variables. Rust will now automatically create a type (like `PrintWithStruct`) for the environment of the closure
+ //@ variables. Rust will now automatically create a type (like `PrintWithString`) for the environment of the closure
//@ with fields for every captured variable, implement the closure trait for this type such that the action performed
//@ is given by the code of the closure, and finally it will instantiate the environment type here at the definition site
//@ of the closure and fill it appropriately.