error: used unwrap or expect in a function that returns result or option
  --> $DIR/unwrap_in_result.rs:22:5
   |
LL | /     fn bad_divisible_by_3(i_str: String) -> Result<bool, String> {
LL | |         // checks whether a string represents a number divisible by 3
LL | |         let i = i_str.parse::<i32>().unwrap();
LL | |         if i % 3 == 0 {
...  |
LL | |         }
LL | |     }
   | |_____^
   |
   = note: `-D clippy::unwrap-in-result` implied by `-D warnings`
   = help: unwrap and expect should not be used in a function that returns result or option
note: potential non-recoverable error(s)
  --> $DIR/unwrap_in_result.rs:24:17
   |
LL |         let i = i_str.parse::<i32>().unwrap();
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: used unwrap or expect in a function that returns result or option
  --> $DIR/unwrap_in_result.rs:32:5
   |
LL | /     fn example_option_expect(i_str: String) -> Option<bool> {
LL | |         let i = i_str.parse::<i32>().expect("not a number");
LL | |         if i % 3 == 0 {
LL | |             return Some(true);
LL | |         }
LL | |         None
LL | |     }
   | |_____^
   |
   = help: unwrap and expect should not be used in a function that returns result or option
note: potential non-recoverable error(s)
  --> $DIR/unwrap_in_result.rs:33:17
   |
LL |         let i = i_str.parse::<i32>().expect("not a number");
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors

