1 files changed, 31 insertions, 0 deletions
diff --git a/tests/ui/suggest-null-ptr.rs b/tests/ui/suggest-null-ptr.rs
new file mode 100644
index 000000000..19b595bf7
--- /dev/null
+++ b/tests/ui/suggest-null-ptr.rs
@@ -0,0 +1,31 @@
+// run-rustfix
+
+// Suggest providing a std::ptr::null{,_mut}() to a function that takes in a raw
+// pointer if a literal 0 was provided by the user.
+
+extern "C" {
+    fn foo(ptr: *const u8);
+
+    fn foo_mut(ptr: *mut u8);
+
+    fn usize(ptr: *const usize);
+
+    fn usize_mut(ptr: *mut usize);
+}
+
+fn main() {
+    unsafe {
+        foo(0);
+        //~^ mismatched types [E0308]
+        //~| if you meant to create a null pointer, use `std::ptr::null()`
+        foo_mut(0);
+        //~^ mismatched types [E0308]
+        //~| if you meant to create a null pointer, use `std::ptr::null_mut()`
+        usize(0);
+        //~^ mismatched types [E0308]
+        //~| if you meant to create a null pointer, use `std::ptr::null()`
+        usize_mut(0);
+        //~^ mismatched types [E0308]
+        //~| if you meant to create a null pointer, use `std::ptr::null_mut()`
+    }
+}