--- /dev/null
+// run-rustfix
+#![allow(unused_imports)]
+#![warn(
+ clippy::all,
+ clippy::style,
+ clippy::mem_replace_option_with_none,
+ clippy::mem_replace_with_default
+)]
+
+use std::mem;
+
+fn replace_option_with_none() {
+ let mut an_option = Some(1);
+ let _ = mem::replace(&mut an_option, None);
+ let an_option = &mut Some(1);
+ let _ = mem::replace(an_option, None);
+}
+
+fn replace_with_default() {
+ let mut s = String::from("foo");
+ let _ = std::mem::replace(&mut s, String::default());
+ let s = &mut String::from("foo");
+ let _ = std::mem::replace(s, String::default());
+ let _ = std::mem::replace(s, Default::default());
+}
+
+fn main() {
+ replace_option_with_none();
+ replace_with_default();
+}