Stage 10.13: Prelude
You might be wondering how we have access to Vec or Box everywhere
without a use to import them. It is because of the module prelude in the
standard library.
Know that in the Rust standard library anything that is exported in std::prelude::*
is automatically available to every part of Rust. That is the case for Vec and
Box but others as well (Option, Copy, etc.).
Further information:
