1 files changed, 83 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/unnecessary_operation.rs b/src/tools/clippy/tests/ui/unnecessary_operation.rs
new file mode 100644
index 000000000..08cb9ab52
--- /dev/null
+++ b/src/tools/clippy/tests/ui/unnecessary_operation.rs
@@ -0,0 +1,83 @@
+// run-rustfix
+
+#![feature(box_syntax)]
+#![allow(clippy::deref_addrof, dead_code, unused, clippy::no_effect)]
+#![warn(clippy::unnecessary_operation)]
+
+struct Tuple(i32);
+struct Struct {
+    field: i32,
+}
+enum Enum {
+    Tuple(i32),
+    Struct { field: i32 },
+}
+struct DropStruct {
+    field: i32,
+}
+impl Drop for DropStruct {
+    fn drop(&mut self) {}
+}
+struct DropTuple(i32);
+impl Drop for DropTuple {
+    fn drop(&mut self) {}
+}
+enum DropEnum {
+    Tuple(i32),
+    Struct { field: i32 },
+}
+impl Drop for DropEnum {
+    fn drop(&mut self) {}
+}
+struct FooString {
+    s: String,
+}
+
+fn get_number() -> i32 {
+    0
+}
+
+fn get_usize() -> usize {
+    0
+}
+fn get_struct() -> Struct {
+    Struct { field: 0 }
+}
+fn get_drop_struct() -> DropStruct {
+    DropStruct { field: 0 }
+}
+
+fn main() {
+    Tuple(get_number());
+    Struct { field: get_number() };
+    Struct { ..get_struct() };
+    Enum::Tuple(get_number());
+    Enum::Struct { field: get_number() };
+    5 + get_number();
+    *&get_number();
+    &get_number();
+    (5, 6, get_number());
+    box get_number();
+    get_number()..;
+    ..get_number();
+    5..get_number();
+    [42, get_number()];
+    [42, 55][get_usize()];
+    (42, get_number()).1;
+    [get_number(); 55];
+    [42; 55][get_usize()];
+    {
+        get_number()
+    };
+    FooString {
+        s: String::from("blah"),
+    };
+
+    // Do not warn
+    DropTuple(get_number());
+    DropStruct { field: get_number() };
+    DropStruct { field: get_number() };
+    DropStruct { ..get_drop_struct() };
+    DropEnum::Tuple(get_number());
+    DropEnum::Struct { field: get_number() };
+}