1 files changed, 31 insertions, 0 deletions
diff --git a/tests/ui/inference/inference_unstable.rs b/tests/ui/inference/inference_unstable.rs
new file mode 100644
index 000000000..daf0cf042
--- /dev/null
+++ b/tests/ui/inference/inference_unstable.rs
@@ -0,0 +1,31 @@
+// Ensures #[unstable] functions without opting in the corresponding #![feature]
+// will not break inference.
+
+// aux-build:inference_unstable_iterator.rs
+// aux-build:inference_unstable_itertools.rs
+// run-pass
+
+extern crate inference_unstable_iterator;
+extern crate inference_unstable_itertools;
+
+#[allow(unused_imports)]
+use inference_unstable_iterator::IpuIterator;
+use inference_unstable_itertools::IpuItertools;
+
+fn main() {
+    assert_eq!('x'.ipu_flatten(), 1);
+//~^ WARN an associated function with this name may be added to the standard library in the future
+//~| WARN once this associated item is added to the standard library, the ambiguity may cause an
+    assert_eq!('x'.ipu_by_value_vs_by_ref(), 1);
+//~^ WARN an associated function with this name may be added to the standard library in the future
+//~| WARN once this associated item is added to the standard library, the ambiguity may cause an
+    assert_eq!('x'.ipu_by_ref_vs_by_ref_mut(), 1);
+//~^ WARN an associated function with this name may be added to the standard library in the future
+//~| WARN once this associated item is added to the standard library, the ambiguity may cause an
+    assert_eq!((&mut 'x' as *mut char).ipu_by_mut_ptr_vs_by_const_ptr(), 1);
+//~^ WARN an associated function with this name may be added to the standard library in the future
+//~| WARN once this associated item is added to the standard library, the ambiguity may cause an
+    assert_eq!(char::C, 1);
+//~^ WARN an associated constant with this name may be added to the standard library in the future
+//~| WARN once this associated item is added to the standard library, the ambiguity may cause an
+}