1 files changed, 28 insertions, 0 deletions
diff --git a/tests/ui/rust-2021/future-prelude-collision-turbofish.rs b/tests/ui/rust-2021/future-prelude-collision-turbofish.rs
new file mode 100644
index 00000000000..abb292ef992
--- /dev/null
+++ b/tests/ui/rust-2021/future-prelude-collision-turbofish.rs
@@ -0,0 +1,28 @@
+// See https://github.com/rust-lang/rust/issues/88442
+// run-rustfix
+// edition:2018
+// check-pass
+#![allow(unused)]
+#![warn(rust_2021_prelude_collisions)]
+
+trait AnnotatableTryInto {
+    fn try_into<T>(self) -> Result<T, Self::Error>
+    where Self: std::convert::TryInto<T> {
+        std::convert::TryInto::try_into(self)
+    }
+}
+
+impl<T> AnnotatableTryInto for T where T: From<u8> {}
+
+fn main() -> Result<(), &'static str> {
+    let x: u64 = 1;
+    x.try_into::<usize>().or(Err("foo"))?.checked_sub(1);
+    //~^ WARNING trait method `try_into` will become ambiguous in Rust 2021
+    //~| WARNING this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
+
+    x.try_into::<usize>().or(Err("foo"))?;
+    //~^ WARNING trait method `try_into` will become ambiguous in Rust 2021
+    //~| WARNING this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
+
+    Ok(())
+}