1 files changed, 170 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/mut_reference.fixed b/src/tools/clippy/tests/ui/mut_reference.fixed
new file mode 100644
index 00000000000..03d854099e6
--- /dev/null
+++ b/src/tools/clippy/tests/ui/mut_reference.fixed
@@ -0,0 +1,170 @@
+#![allow(clippy::mut_mut)]
+
+fn takes_ref(a: &i32) {}
+fn takes_refmut(a: &mut i32) {}
+fn takes_ref_ref(a: &&i32) {}
+fn takes_refmut_ref(a: &mut &i32) {}
+fn takes_ref_refmut(a: &&mut i32) {}
+fn takes_refmut_refmut(a: &mut &mut i32) {}
+fn takes_raw_const(a: *const i32) {}
+fn takes_raw_mut(a: *mut i32) {}
+
+mod issue11268 {
+    macro_rules! x {
+        (1 $f:expr) => {
+            $f(&mut 1);
+        };
+        (2 $f:expr) => {
+            $f(&mut &1)
+        };
+        (3 $f:expr) => {
+            $f(&mut &mut 1)
+        };
+        (4 $f:expr) => {
+            let mut a = 1;
+            $f(&raw mut a)
+        };
+    }
+
+    fn f() {
+        x!(1 super::takes_ref);
+        x!(1 super::takes_refmut);
+        x!(2 super::takes_refmut_ref);
+        x!(3 super::takes_ref_refmut);
+        x!(3 super::takes_refmut_refmut);
+        x!(4 super::takes_raw_const);
+        x!(4 super::takes_raw_mut);
+    }
+}
+
+struct MyStruct;
+
+impl MyStruct {
+    fn takes_ref(&self, a: &i32) {}
+    fn takes_refmut(&self, a: &mut i32) {}
+    fn takes_ref_ref(&self, a: &&i32) {}
+    fn takes_refmut_ref(&self, a: &mut &i32) {}
+    fn takes_ref_refmut(&self, a: &&mut i32) {}
+    fn takes_refmut_refmut(&self, a: &mut &mut i32) {}
+    fn takes_raw_const(&self, a: *const i32) {}
+    fn takes_raw_mut(&self, a: *mut i32) {}
+}
+
+#[warn(clippy::unnecessary_mut_passed)]
+fn main() {
+    // Functions
+    takes_ref(&42);
+    //~^ unnecessary_mut_passed
+    takes_ref_ref(&&42);
+    //~^ unnecessary_mut_passed
+    takes_ref_refmut(&&mut 42);
+    //~^ unnecessary_mut_passed
+    takes_raw_const(&42);
+    //~^ unnecessary_mut_passed
+
+    let as_ptr: fn(&i32) = takes_ref;
+    as_ptr(&42);
+    //~^ unnecessary_mut_passed
+    let as_ptr: fn(&&i32) = takes_ref_ref;
+    as_ptr(&&42);
+    //~^ unnecessary_mut_passed
+    let as_ptr: fn(&&mut i32) = takes_ref_refmut;
+    as_ptr(&&mut 42);
+    //~^ unnecessary_mut_passed
+    let as_ptr: fn(*const i32) = takes_raw_const;
+    as_ptr(&42);
+    //~^ unnecessary_mut_passed
+
+    // Methods
+    let my_struct = MyStruct;
+    my_struct.takes_ref(&42);
+    //~^ unnecessary_mut_passed
+    my_struct.takes_ref_ref(&&42);
+    //~^ unnecessary_mut_passed
+    my_struct.takes_ref_refmut(&&mut 42);
+    //~^ unnecessary_mut_passed
+    my_struct.takes_raw_const(&42);
+    //~^ unnecessary_mut_passed
+
+    // No error
+
+    // Functions
+    takes_ref(&42);
+    let as_ptr: fn(&i32) = takes_ref;
+    as_ptr(&42);
+
+    takes_refmut(&mut 42);
+    let as_ptr: fn(&mut i32) = takes_refmut;
+    as_ptr(&mut 42);
+
+    takes_ref_ref(&&42);
+    let as_ptr: fn(&&i32) = takes_ref_ref;
+    as_ptr(&&42);
+
+    takes_refmut_ref(&mut &42);
+    let as_ptr: fn(&mut &i32) = takes_refmut_ref;
+    as_ptr(&mut &42);
+
+    takes_ref_refmut(&&mut 42);
+    let as_ptr: fn(&&mut i32) = takes_ref_refmut;
+    as_ptr(&&mut 42);
+
+    takes_refmut_refmut(&mut &mut 42);
+    let as_ptr: fn(&mut &mut i32) = takes_refmut_refmut;
+    as_ptr(&mut &mut 42);
+
+    takes_raw_const(&42);
+    let as_ptr: fn(*const i32) = takes_raw_const;
+    as_ptr(&42);
+
+    takes_raw_mut(&mut 42);
+    let as_ptr: fn(*mut i32) = takes_raw_mut;
+    as_ptr(&mut 42);
+
+    let a = &mut 42;
+    let b = &mut &42;
+    let c = &mut &mut 42;
+    takes_ref(a);
+    takes_ref_ref(b);
+    takes_ref_refmut(c);
+    takes_raw_const(a);
+
+    // Methods
+    my_struct.takes_ref(&42);
+    my_struct.takes_refmut(&mut 42);
+    my_struct.takes_ref_ref(&&42);
+    my_struct.takes_refmut_ref(&mut &42);
+    my_struct.takes_ref_refmut(&&mut 42);
+    my_struct.takes_refmut_refmut(&mut &mut 42);
+    my_struct.takes_raw_const(&42);
+    my_struct.takes_raw_mut(&mut 42);
+    my_struct.takes_ref(a);
+    my_struct.takes_ref_ref(b);
+    my_struct.takes_ref_refmut(c);
+    my_struct.takes_raw_const(a);
+    my_struct.takes_raw_mut(a);
+}
+
+// not supported currently
+fn raw_ptrs(my_struct: MyStruct) {
+    let mut n = 42;
+
+    takes_raw_const(&raw mut n);
+
+    let as_ptr: fn(*const i32) = takes_raw_const;
+    as_ptr(&raw mut n);
+
+    my_struct.takes_raw_const(&raw mut n);
+
+    // No error
+
+    takes_raw_const(&raw const n);
+    takes_raw_mut(&raw mut n);
+
+    let a = &raw mut n;
+    takes_raw_const(a);
+
+    my_struct.takes_raw_const(&raw const n);
+    my_struct.takes_raw_mut(&raw mut n);
+    my_struct.takes_raw_const(a);
+}