1 files changed, 55 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/assign_ops2.rs b/src/tools/clippy/tests/ui/assign_ops2.rs
new file mode 100644
index 000000000..f6d3a8fa3
--- /dev/null
+++ b/src/tools/clippy/tests/ui/assign_ops2.rs
@@ -0,0 +1,55 @@
+#[allow(unused_assignments)]
+#[warn(clippy::misrefactored_assign_op, clippy::assign_op_pattern)]
+fn main() {
+    let mut a = 5;
+    a += a + 1;
+    a += 1 + a;
+    a -= a - 1;
+    a *= a * 99;
+    a *= 42 * a;
+    a /= a / 2;
+    a %= a % 5;
+    a &= a & 1;
+    a *= a * a;
+    a = a * a * a;
+    a = a * 42 * a;
+    a = a * 2 + a;
+    a -= 1 - a;
+    a /= 5 / a;
+    a %= 42 % a;
+    a <<= 6 << a;
+}
+
+// check that we don't lint on op assign impls, because that's just the way to impl them
+
+use std::ops::{Mul, MulAssign};
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub struct Wrap(i64);
+
+impl Mul<i64> for Wrap {
+    type Output = Self;
+
+    fn mul(self, rhs: i64) -> Self {
+        Wrap(self.0 * rhs)
+    }
+}
+
+impl MulAssign<i64> for Wrap {
+    fn mul_assign(&mut self, rhs: i64) {
+        *self = *self * rhs
+    }
+}
+
+fn cow_add_assign() {
+    use std::borrow::Cow;
+    let mut buf = Cow::Owned(String::from("bar"));
+    let cows = Cow::Borrowed("foo");
+
+    // this can be linted
+    buf = buf + cows.clone();
+
+    // this should not as cow<str> Add is not commutative
+    buf = cows + buf;
+    println!("{}", buf);
+}