1 files changed, 67 insertions, 0 deletions
diff --git a/tests/ui/closures/2229_closure_analysis/migrations/precise.rs b/tests/ui/closures/2229_closure_analysis/migrations/precise.rs
new file mode 100644
index 000000000..f5e99002b
--- /dev/null
+++ b/tests/ui/closures/2229_closure_analysis/migrations/precise.rs
@@ -0,0 +1,67 @@
+// run-rustfix
+
+#![deny(rust_2021_incompatible_closure_captures)]
+//~^ NOTE: the lint level is defined here
+
+#[derive(Debug)]
+struct Foo(i32);
+impl Drop for Foo {
+    fn drop(&mut self) {
+        println!("{:?} dropped", self.0);
+    }
+}
+
+struct ConstainsDropField(Foo, Foo);
+
+// Test that lint is triggered if a path that implements Drop is not captured by move
+fn test_precise_analysis_drop_paths_not_captured_by_move() {
+    let t = ConstainsDropField(Foo(10), Foo(20));
+
+    let c = || {
+        //~^ ERROR: drop order
+        //~| NOTE: for more information, see
+        //~| HELP: add a dummy let to cause `t` to be fully captured
+        let _t = t.0;
+        //~^ NOTE: in Rust 2018, this closure captures all of `t`, but in Rust 2021, it will only capture `t.0`
+        let _t = &t.1;
+    };
+
+    c();
+}
+//~^ NOTE: in Rust 2018, `t` is dropped here, but in Rust 2021, only `t.0` will be dropped here as part of the closure
+
+struct S;
+impl Drop for S {
+    fn drop(&mut self) {}
+}
+
+struct T(S, S);
+struct U(T, T);
+
+// Test precise analysis for the lint works with paths longer than one.
+fn test_precise_analysis_long_path_missing() {
+    let u = U(T(S, S), T(S, S));
+
+    let c = || {
+        //~^ ERROR: drop order
+        //~| NOTE: for more information, see
+        //~| HELP: add a dummy let to cause `u` to be fully captured
+        let _x = u.0.0;
+        //~^ NOTE: in Rust 2018, this closure captures all of `u`, but in Rust 2021, it will only capture `u.0.0`
+        let _x = u.0.1;
+        //~^ NOTE: in Rust 2018, this closure captures all of `u`, but in Rust 2021, it will only capture `u.0.1`
+        let _x = u.1.0;
+        //~^ NOTE: in Rust 2018, this closure captures all of `u`, but in Rust 2021, it will only capture `u.1.0`
+    };
+
+    c();
+}
+//~^ NOTE: in Rust 2018, `u` is dropped here, but in Rust 2021, only `u.0.0` will be dropped here as part of the closure
+//~| NOTE: in Rust 2018, `u` is dropped here, but in Rust 2021, only `u.0.1` will be dropped here as part of the closure
+//~| NOTE: in Rust 2018, `u` is dropped here, but in Rust 2021, only `u.1.0` will be dropped here as part of the closure
+
+
+fn main() {
+    test_precise_analysis_drop_paths_not_captured_by_move();
+    test_precise_analysis_long_path_missing();
+}