error: needless `fn main` in doctest
  --> tests/ui/doc/needless_doctest_main.rs:23:5
   |
LL |   /// fn main() {
   |  _____^
LL | |
LL | | ///     let a = 0;
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
  --> tests/ui/doc/needless_doctest_main.rs:77:5
   |
LL |   /// fn main() {
   |  _____^
LL | |
LL | | ///     // Hi!
LL | | ///     let _ = 0;
LL | | /// }
   | |_____^

error: needless `fn main` in doctest
  --> tests/ui/doc/needless_doctest_main.rs:88:5
   |
LL |   /// fn     main (){
   |  _____^
LL | |
LL | | ///     let _ = 0;
LL | | /// }
   | |_____^

error: aborting due to 3 previous errors