1 files changed, 17 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/cmp_null.rs b/src/tools/clippy/tests/ui/cmp_null.rs
new file mode 100644
index 000000000..2d2d04178
--- /dev/null
+++ b/src/tools/clippy/tests/ui/cmp_null.rs
@@ -0,0 +1,17 @@
+#![warn(clippy::cmp_null)]
+#![allow(unused_mut)]
+
+use std::ptr;
+
+fn main() {
+    let x = 0;
+    let p: *const usize = &x;
+    if p == ptr::null() {
+        println!("This is surprising!");
+    }
+    let mut y = 0;
+    let mut m: *mut usize = &mut y;
+    if m == ptr::null_mut() {
+        println!("This is surprising, too!");
+    }
+}