warning: needless fn main in doctest

[szabgab]

I ran cargo clippy in the repo and got this report:

    Checking fomat-macros v0.3.2 (/home/gabor/os/fomat-macros)
warning: needless `fn main` in doctest
  --> src/lib.rs:23:4
   |
23 | //! use fomat_macros::pintln;
   |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_doctest_main
   = note: `#[warn(clippy::needless_doctest_main)]` on by default

warning: `fomat-macros` (lib) generated 1 warning
    Finished dev [unoptimized + debuginfo] target(s) in 0.08s

Is it maybe because of a missing # on line 25 in front of the fn main?

[szabgab]

Trying to understand the source of this, I actually like the fact that we can see the full example on the docs site, including the fn main part.