1 files changed, 24 insertions, 0 deletions
diff --git a/third_party/rust/pin-project/tests/ui/project/ambiguous-let.rs b/third_party/rust/pin-project/tests/ui/project/ambiguous-let.rs
new file mode 100644
index 0000000000..a7067494ec
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/project/ambiguous-let.rs
@@ -0,0 +1,24 @@
+use pin_project::{pin_project, project};
+
+#[pin_project]
+enum Enum<A, B> {
+    A(#[pin] A),
+    B(B),
+}
+
+struct Struct<T>(T);
+
+#[project]
+fn foo() {
+    let mut foo: Enum<bool, bool> = Enum::A(true);
+
+    #[project]
+    let Struct(x) = match Pin::new(&mut foo).project() {
+        //~^ ERROR Both initializer expression and pattern are replaceable, you need to split the initializer expression into separate let bindings to avoid ambiguity
+        Enum::A(_) => Struct(true),
+        Enum::B(_) => unreachable!(),
+    };
+    assert!(x);
+}
+
+fn main() {}