Update upstream source from tag 'upstream/1.52.1+dfsg1'

[rustc.git] / src / tools / clippy / tests / ui / cmp_null.rs

diff --git a/src/tools/clippy/tests/ui/cmp_null.rs b/src/tools/clippy/tests/ui/cmp_null.rs
new file mode 100644 (file)
index 0000000..2d2d041
--- /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!");
+    }
+}