error: needless `fn main` in doctest
  --> $DIR/needless_doc_main.rs:7:5
   |
LL |   /// fn main() {
   |  _____^
LL | |
LL | |
LL | | ///     unimplemented!();
LL | | /// }
   | |_____^
   |
   = note: `-D clippy::needless-doctest-main` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::needless_doctest_main)]`

error: needless `fn main` in doctest
  --> $DIR/needless_doc_main.rs:16:5
   |
LL |   /// fn main() -> () {
   |  _____^
LL | |
LL | | ///     unimplemented!();
LL | | /// }
   | |_____^

error: needless `fn main` in doctest
  --> $DIR/needless_doc_main.rs:24:5
   |
LL |   /// fn main() {
   |  _____^
LL | |
LL | | ///     unimplemented!();
LL | | /// }
   | |_____^

error: needless `fn main` in doctest
  --> $DIR/needless_doc_main.rs:32:5
   |
LL |   /// // the fn is not always the first line
   |  _____^
LL | |
LL | | /// fn main() {
LL | | ///     unimplemented!();
LL | | /// }
   | |_____^

error: aborting due to 4 previous errors