1 files changed, 60 insertions, 0 deletions
diff --git a/tests/ui/zero_repeat_side_effects.rs b/tests/ui/zero_repeat_side_effects.rs
new file mode 100644
index 00000000000..9d9c367375a
--- /dev/null
+++ b/tests/ui/zero_repeat_side_effects.rs
@@ -0,0 +1,60 @@
+#![warn(clippy::zero_repeat_side_effects)]
+#![allow(clippy::unnecessary_operation)]
+#![allow(clippy::useless_vec)]
+#![allow(clippy::needless_late_init)]
+
+fn f() -> i32 {
+    println!("side effect");
+    10
+}
+
+fn main() {
+    const N: usize = 0;
+    const M: usize = 1;
+
+    // should trigger
+
+    // on arrays
+    let a = [f(); 0];
+    let a = [f(); N];
+    let mut b;
+    b = [f(); 0];
+    b = [f(); N];
+
+    // on vecs
+    // vecs dont support infering value of consts
+    let c = vec![f(); 0];
+    let d;
+    d = vec![f(); 0];
+
+    // for macros
+    let e = [println!("side effect"); 0];
+
+    // for nested calls
+    let g = [{ f() }; 0];
+
+    // as function param
+    drop(vec![f(); 0]);
+
+    // when singled out/not part of assignment/local
+    vec![f(); 0];
+    [f(); 0];
+    [f(); N];
+
+    // should not trigger
+
+    // on arrays with > 0 repeat
+    let a = [f(); 1];
+    let a = [f(); M];
+    let mut b;
+    b = [f(); 1];
+    b = [f(); M];
+
+    // on vecs with > 0 repeat
+    let c = vec![f(); 1];
+    let d;
+    d = vec![f(); 1];
+
+    // as function param
+    drop(vec![f(); 1]);
+}