The function marked `#[start]` is passed the command line parameters
in the same format as C:
-```
+```rust
#![feature(lang_items, start, no_std, libc)]
#![no_std]
As an example, here is a program that will calculate the dot product of two
vectors provided from C, using idiomatic Rust practices.
-```
+```ignore
#![feature(lang_items, start, no_std, core, libc)]
#![no_std]