extern crateTo link a crate to this new library, the extern crate declaration must be
used. This will not only link the library, but also import all its items
under a module named the same as the library. The visibility rules that apply
to modules also apply to libraries.
// executable.rs
// Link to `liberty`, import items under the `erty` module
extern crate erty;
fn main() {
erty::public_function();
// Error! `private_function` is private
//erty::private_function();
erty::indirect_access();
}
# The `-L .` argument adds the current directory to the library search path
$ rustc -L . executable.rs && ./executable
called erty's `public_function()`
called erty's `indirect_access()`, that
> called erty's `private_function()`