1 files changed, 25 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/needless_update.rs b/src/tools/clippy/tests/ui/needless_update.rs
new file mode 100644
index 000000000..b93ff048a
--- /dev/null
+++ b/src/tools/clippy/tests/ui/needless_update.rs
@@ -0,0 +1,25 @@
+#![warn(clippy::needless_update)]
+#![allow(clippy::no_effect)]
+
+struct S {
+    pub a: i32,
+    pub b: i32,
+}
+
+#[non_exhaustive]
+struct T {
+    pub x: i32,
+    pub y: i32,
+}
+
+fn main() {
+    let base = S { a: 0, b: 0 };
+    S { ..base }; // no error
+    S { a: 1, ..base }; // no error
+    S { a: 1, b: 1, ..base };
+
+    let base = T { x: 0, y: 0 };
+    T { ..base }; // no error
+    T { x: 1, ..base }; // no error
+    T { x: 1, y: 1, ..base }; // no error
+}