error: called `.as_ref().map(Deref::deref)` on an Option value. This can be done more directly by calling `opt.clone().as_deref()` instead
  --> $DIR/option_as_ref_deref.rs:11:13
   |
LL |     let _ = opt.clone().as_ref().map(Deref::deref).map(str::len);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.clone().as_deref()`
   |
   = note: `-D clippy::option-as-ref-deref` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::option_as_ref_deref)]`

error: called `.as_ref().map(Deref::deref)` on an Option value. This can be done more directly by calling `opt.clone().as_deref()` instead
  --> $DIR/option_as_ref_deref.rs:14:13
   |
LL |       let _ = opt.clone()
   |  _____________^
LL | |         .as_ref().map(
LL | |             Deref::deref
LL | |         )
   | |_________^ help: try using as_deref instead: `opt.clone().as_deref()`

error: called `.as_mut().map(DerefMut::deref_mut)` on an Option value. This can be done more directly by calling `opt.as_deref_mut()` instead
  --> $DIR/option_as_ref_deref.rs:20:13
   |
LL |     let _ = opt.as_mut().map(DerefMut::deref_mut);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref_mut instead: `opt.as_deref_mut()`

error: called `.as_ref().map(String::as_str)` on an Option value. This can be done more directly by calling `opt.as_deref()` instead
  --> $DIR/option_as_ref_deref.rs:22:13
   |
LL |     let _ = opt.as_ref().map(String::as_str);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.as_deref()`

error: called `.as_ref().map(|x| x.as_str())` on an Option value. This can be done more directly by calling `opt.as_deref()` instead
  --> $DIR/option_as_ref_deref.rs:23:13
   |
LL |     let _ = opt.as_ref().map(|x| x.as_str());
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.as_deref()`

error: called `.as_mut().map(String::as_mut_str)` on an Option value. This can be done more directly by calling `opt.as_deref_mut()` instead
  --> $DIR/option_as_ref_deref.rs:24:13
   |
LL |     let _ = opt.as_mut().map(String::as_mut_str);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref_mut instead: `opt.as_deref_mut()`

error: called `.as_mut().map(|x| x.as_mut_str())` on an Option value. This can be done more directly by calling `opt.as_deref_mut()` instead
  --> $DIR/option_as_ref_deref.rs:25:13
   |
LL |     let _ = opt.as_mut().map(|x| x.as_mut_str());
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref_mut instead: `opt.as_deref_mut()`

error: called `.as_ref().map(CString::as_c_str)` on an Option value. This can be done more directly by calling `Some(CString::new(vec![]).unwrap()).as_deref()` instead
  --> $DIR/option_as_ref_deref.rs:26:13
   |
LL |     let _ = Some(CString::new(vec![]).unwrap()).as_ref().map(CString::as_c_str);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `Some(CString::new(vec![]).unwrap()).as_deref()`

error: called `.as_ref().map(OsString::as_os_str)` on an Option value. This can be done more directly by calling `Some(OsString::new()).as_deref()` instead
  --> $DIR/option_as_ref_deref.rs:27:13
   |
LL |     let _ = Some(OsString::new()).as_ref().map(OsString::as_os_str);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `Some(OsString::new()).as_deref()`

error: called `.as_ref().map(PathBuf::as_path)` on an Option value. This can be done more directly by calling `Some(PathBuf::new()).as_deref()` instead
  --> $DIR/option_as_ref_deref.rs:28:13
   |
LL |     let _ = Some(PathBuf::new()).as_ref().map(PathBuf::as_path);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `Some(PathBuf::new()).as_deref()`

error: called `.as_ref().map(Vec::as_slice)` on an Option value. This can be done more directly by calling `Some(Vec::<()>::new()).as_deref()` instead
  --> $DIR/option_as_ref_deref.rs:29:13
   |
LL |     let _ = Some(Vec::<()>::new()).as_ref().map(Vec::as_slice);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `Some(Vec::<()>::new()).as_deref()`

error: called `.as_mut().map(Vec::as_mut_slice)` on an Option value. This can be done more directly by calling `Some(Vec::<()>::new()).as_deref_mut()` instead
  --> $DIR/option_as_ref_deref.rs:30:13
   |
LL |     let _ = Some(Vec::<()>::new()).as_mut().map(Vec::as_mut_slice);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref_mut instead: `Some(Vec::<()>::new()).as_deref_mut()`

error: called `.as_ref().map(|x| x.deref())` on an Option value. This can be done more directly by calling `opt.as_deref()` instead
  --> $DIR/option_as_ref_deref.rs:32:13
   |
LL |     let _ = opt.as_ref().map(|x| x.deref());
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.as_deref()`

error: called `.as_mut().map(|x| x.deref_mut())` on an Option value. This can be done more directly by calling `opt.clone().as_deref_mut()` instead
  --> $DIR/option_as_ref_deref.rs:33:13
   |
LL |     let _ = opt.clone().as_mut().map(|x| x.deref_mut()).map(|x| x.len());
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref_mut instead: `opt.clone().as_deref_mut()`

error: called `.as_ref().map(|x| &**x)` on an Option value. This can be done more directly by calling `opt.as_deref()` instead
  --> $DIR/option_as_ref_deref.rs:40:13
   |
LL |     let _ = opt.as_ref().map(|x| &**x);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.as_deref()`

error: called `.as_mut().map(|x| &mut **x)` on an Option value. This can be done more directly by calling `opt.as_deref_mut()` instead
  --> $DIR/option_as_ref_deref.rs:41:13
   |
LL |     let _ = opt.as_mut().map(|x| &mut **x);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref_mut instead: `opt.as_deref_mut()`

error: called `.as_ref().map(std::ops::Deref::deref)` on an Option value. This can be done more directly by calling `opt.as_deref()` instead
  --> $DIR/option_as_ref_deref.rs:44:13
   |
LL |     let _ = opt.as_ref().map(std::ops::Deref::deref);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.as_deref()`

error: called `.as_ref().map(String::as_str)` on an Option value. This can be done more directly by calling `opt.as_deref()` instead
  --> $DIR/option_as_ref_deref.rs:56:13
   |
LL |     let _ = opt.as_ref().map(String::as_str);
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.as_deref()`

error: aborting due to 18 previous errors