Constant CODE_FIBONACCI 

pub const CODE_FIBONACCI: &str = r#"## Main

Let n be 10.
Let a be 0.
Let b be 1.

Show "Fibonacci sequence:".
Show a.

Repeat for i from 1 to n:
    Show b.
    Let temp be a + b.
    Set a to b.
    Set b to temp.
"#;