error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:8:13
   |
LL |     let _ = !a.is_some();
   |             ^^^^^^^^^^^^ help: try: `a.is_none()`
   |
   = note: `-D clippy::nonminimal-bool` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::nonminimal_bool)]`

error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:10:13
   |
LL |     let _ = !a.is_none();
   |             ^^^^^^^^^^^^ help: try: `a.is_some()`

error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:12:13
   |
LL |     let _ = !b.is_err();
   |             ^^^^^^^^^^^ help: try: `b.is_ok()`

error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:14:13
   |
LL |     let _ = !b.is_ok();
   |             ^^^^^^^^^^ help: try: `b.is_err()`

error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:16:13
   |
LL |     let _ = !(a.is_some() && !c);
   |             ^^^^^^^^^^^^^^^^^^^^ help: try: `a.is_none() || c`

error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:17:13
   |
LL |     let _ = !(a.is_some() || !c);
   |             ^^^^^^^^^^^^^^^^^^^^ help: try: `a.is_none() && c`

error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:18:26
   |
LL |     let _ = !(!c ^ c) || !a.is_some();
   |                          ^^^^^^^^^^^^ help: try: `a.is_none()`

error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:19:25
   |
LL |     let _ = (!c ^ c) || !a.is_some();
   |                         ^^^^^^^^^^^^ help: try: `a.is_none()`

error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:20:23
   |
LL |     let _ = !c ^ c || !a.is_some();
   |                       ^^^^^^^^^^^^ help: try: `a.is_none()`

error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:92:8
   |
LL |     if !res.is_ok() {}
   |        ^^^^^^^^^^^^ help: try: `res.is_err()`

error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:93:8
   |
LL |     if !res.is_err() {}
   |        ^^^^^^^^^^^^^ help: try: `res.is_ok()`

error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:96:8
   |
LL |     if !res.is_some() {}
   |        ^^^^^^^^^^^^^^ help: try: `res.is_none()`

error: this boolean expression can be simplified
  --> $DIR/nonminimal_bool_methods.rs:97:8
   |
LL |     if !res.is_none() {}
   |        ^^^^^^^^^^^^^^ help: try: `res.is_some()`

error: aborting due to 13 previous errors