1 files changed, 136 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/useless_asref.fixed b/src/tools/clippy/tests/ui/useless_asref.fixed
new file mode 100644
index 000000000..90cb8945e
--- /dev/null
+++ b/src/tools/clippy/tests/ui/useless_asref.fixed
@@ -0,0 +1,136 @@
+// run-rustfix
+
+#![deny(clippy::useless_asref)]
+#![allow(clippy::explicit_auto_deref)]
+
+use std::fmt::Debug;
+
+struct FakeAsRef;
+
+#[allow(clippy::should_implement_trait)]
+impl FakeAsRef {
+    fn as_ref(&self) -> &Self {
+        self
+    }
+}
+
+struct MoreRef;
+
+impl<'a, 'b, 'c> AsRef<&'a &'b &'c MoreRef> for MoreRef {
+    fn as_ref(&self) -> &&'a &'b &'c MoreRef {
+        &&&&MoreRef
+    }
+}
+
+fn foo_rstr(x: &str) {
+    println!("{:?}", x);
+}
+fn foo_rslice(x: &[i32]) {
+    println!("{:?}", x);
+}
+fn foo_mrslice(x: &mut [i32]) {
+    println!("{:?}", x);
+}
+fn foo_rrrrmr(_: &&&&MoreRef) {
+    println!("so many refs");
+}
+
+fn not_ok() {
+    let rstr: &str = "hello";
+    let mut mrslice: &mut [i32] = &mut [1, 2, 3];
+
+    {
+        let rslice: &[i32] = &*mrslice;
+        foo_rstr(rstr);
+        foo_rstr(rstr);
+        foo_rslice(rslice);
+        foo_rslice(rslice);
+    }
+    {
+        foo_mrslice(mrslice);
+        foo_mrslice(mrslice);
+        foo_rslice(mrslice);
+        foo_rslice(mrslice);
+    }
+
+    {
+        let rrrrrstr = &&&&rstr;
+        let rrrrrslice = &&&&&*mrslice;
+        foo_rslice(rrrrrslice);
+        foo_rslice(rrrrrslice);
+        foo_rstr(rrrrrstr);
+        foo_rstr(rrrrrstr);
+    }
+    {
+        let mrrrrrslice = &mut &mut &mut &mut mrslice;
+        foo_mrslice(mrrrrrslice);
+        foo_mrslice(mrrrrrslice);
+        foo_rslice(mrrrrrslice);
+        foo_rslice(mrrrrrslice);
+    }
+    #[allow(unused_parens, clippy::double_parens, clippy::needless_borrow)]
+    foo_rrrrmr((&&&&MoreRef));
+
+    generic_not_ok(mrslice);
+    generic_ok(mrslice);
+}
+
+fn ok() {
+    let string = "hello".to_owned();
+    let mut arr = [1, 2, 3];
+    let mut vec = vec![1, 2, 3];
+
+    {
+        foo_rstr(string.as_ref());
+        foo_rslice(arr.as_ref());
+        foo_rslice(vec.as_ref());
+    }
+    {
+        foo_mrslice(arr.as_mut());
+        foo_mrslice(vec.as_mut());
+    }
+
+    {
+        let rrrrstring = &&&&string;
+        let rrrrarr = &&&&arr;
+        let rrrrvec = &&&&vec;
+        foo_rstr(rrrrstring.as_ref());
+        foo_rslice(rrrrarr.as_ref());
+        foo_rslice(rrrrvec.as_ref());
+    }
+    {
+        let mrrrrarr = &mut &mut &mut &mut arr;
+        let mrrrrvec = &mut &mut &mut &mut vec;
+        foo_mrslice(mrrrrarr.as_mut());
+        foo_mrslice(mrrrrvec.as_mut());
+    }
+    FakeAsRef.as_ref();
+    foo_rrrrmr(MoreRef.as_ref());
+
+    generic_not_ok(arr.as_mut());
+    generic_ok(&mut arr);
+}
+
+fn foo_mrt<T: Debug + ?Sized>(t: &mut T) {
+    println!("{:?}", t);
+}
+fn foo_rt<T: Debug + ?Sized>(t: &T) {
+    println!("{:?}", t);
+}
+
+fn generic_not_ok<T: AsMut<T> + AsRef<T> + Debug + ?Sized>(mrt: &mut T) {
+    foo_mrt(mrt);
+    foo_mrt(mrt);
+    foo_rt(mrt);
+    foo_rt(mrt);
+}
+
+fn generic_ok<U: AsMut<T> + AsRef<T> + ?Sized, T: Debug + ?Sized>(mru: &mut U) {
+    foo_mrt(mru.as_mut());
+    foo_rt(mru.as_ref());
+}
+
+fn main() {
+    not_ok();
+    ok();
+}