error: called `map(..).flatten()` on `Option`
  --> $DIR/map_flatten.rs:8:10
   |
LL |           .map(|x| {
   |  __________^
LL | |
LL | |
LL | |             if x <= 5 {
...  |
LL | |         })
LL | |         .flatten();
   | |__________________^
   |
   = note: `-D clippy::map-flatten` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::map_flatten)]`
help: try replacing `map` with `and_then` and remove the `.flatten()`
   |
LL ~         .and_then(|x| {
LL +
LL +
LL +             if x <= 5 {
LL +                 Some(x)
LL +             } else {
LL +                 None
LL +             }
LL ~         });
   |

error: called `map(..).flatten()` on `Result`
  --> $DIR/map_flatten.rs:20:10
   |
LL |           .map(|x| {
   |  __________^
LL | |
LL | |             if x == 1 {
LL | |                 Ok(x)
...  |
LL | |         })
LL | |         .flatten();
   | |__________________^
   |
help: try replacing `map` with `and_then` and remove the `.flatten()`
   |
LL ~         .and_then(|x| {
LL +
LL +             if x == 1 {
LL +                 Ok(x)
LL +             } else {
LL +                 Err(0)
LL +             }
LL ~         });
   |

error: called `map(..).flatten()` on `Result`
  --> $DIR/map_flatten.rs:33:10
   |
LL |           .map(|res| {
   |  __________^
LL | |
LL | |             if res > 0 {
LL | |                 do_something();
...  |
LL | |         })
LL | |         .flatten();
   | |__________________^
   |
help: try replacing `map` with `and_then` and remove the `.flatten()`
   |
LL ~         .and_then(|res| {
LL +
LL +             if res > 0 {
LL +                 do_something();
LL +                 Ok(res)
LL +             } else {
LL +                 Err(0)
LL +             }
LL ~         });
   |

error: called `map(..).flatten()` on `Iterator`
  --> $DIR/map_flatten.rs:46:10
   |
LL |           .map(|some_value| {
   |  __________^
LL | |
LL | |             if some_value > 3 {
LL | |                 Some(some_value)
...  |
LL | |         })
LL | |         .flatten()
   | |__________________^
   |
help: try replacing `map` with `filter_map` and remove the `.flatten()`
   |
LL ~         .filter_map(|some_value| {
LL +
LL +             if some_value > 3 {
LL +                 Some(some_value)
LL +             } else {
LL +                 None
LL +             }
LL +         })
   |

error: aborting due to 4 previous errors