1 files changed, 78 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/transmute_ptr_to_ref.rs b/src/tools/clippy/tests/ui/transmute_ptr_to_ref.rs
new file mode 100644
index 000000000..fe49cdc32
--- /dev/null
+++ b/src/tools/clippy/tests/ui/transmute_ptr_to_ref.rs
@@ -0,0 +1,78 @@
+// run-rustfix
+
+#![feature(custom_inner_attributes)]
+#![warn(clippy::transmute_ptr_to_ref)]
+#![allow(clippy::match_single_binding)]
+
+unsafe fn _ptr_to_ref<T, U>(p: *const T, m: *mut T, o: *const U, om: *mut U) {
+    let _: &T = std::mem::transmute(p);
+    let _: &T = &*p;
+
+    let _: &mut T = std::mem::transmute(m);
+    let _: &mut T = &mut *m;
+
+    let _: &T = std::mem::transmute(m);
+    let _: &T = &*m;
+
+    let _: &mut T = std::mem::transmute(p as *mut T);
+    let _ = &mut *(p as *mut T);
+
+    let _: &T = std::mem::transmute(o);
+    let _: &T = &*(o as *const T);
+
+    let _: &mut T = std::mem::transmute(om);
+    let _: &mut T = &mut *(om as *mut T);
+
+    let _: &T = std::mem::transmute(om);
+    let _: &T = &*(om as *const T);
+}
+
+fn _issue1231() {
+    struct Foo<'a, T> {
+        bar: &'a T,
+    }
+
+    let raw = 42 as *const i32;
+    let _: &Foo<u8> = unsafe { std::mem::transmute::<_, &Foo<_>>(raw) };
+
+    let _: &Foo<&u8> = unsafe { std::mem::transmute::<_, &Foo<&_>>(raw) };
+
+    type Bar<'a> = &'a u8;
+    let raw = 42 as *const i32;
+    unsafe { std::mem::transmute::<_, Bar>(raw) };
+}
+
+unsafe fn _issue8924<'a, 'b, 'c>(x: *const &'a u32, y: *const &'b u32) -> &'c &'b u32 {
+    match 0 {
+        0 => std::mem::transmute(x),
+        1 => std::mem::transmute(y),
+        2 => std::mem::transmute::<_, &&'b u32>(x),
+        _ => std::mem::transmute::<_, &&'b u32>(y),
+    }
+}
+
+unsafe fn _meets_msrv<'a, 'b, 'c>(x: *const &'a u32) -> &'c &'b u32 {
+    #![clippy::msrv = "1.38"]
+    let a = 0u32;
+    let a = &a as *const u32;
+    let _: &u32 = std::mem::transmute(a);
+    let _: &u32 = std::mem::transmute::<_, &u32>(a);
+    match 0 {
+        0 => std::mem::transmute(x),
+        _ => std::mem::transmute::<_, &&'b u32>(x),
+    }
+}
+
+unsafe fn _under_msrv<'a, 'b, 'c>(x: *const &'a u32) -> &'c &'b u32 {
+    #![clippy::msrv = "1.37"]
+    let a = 0u32;
+    let a = &a as *const u32;
+    let _: &u32 = std::mem::transmute(a);
+    let _: &u32 = std::mem::transmute::<_, &u32>(a);
+    match 0 {
+        0 => std::mem::transmute(x),
+        _ => std::mem::transmute::<_, &&'b u32>(x),
+    }
+}
+
+fn main() {}