1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/ui/compile-fail-migration/trait-static-method-generic-inference.rs b/src/test/ui/compile-fail-migration/trait-static-method-generic-inference.rs
new file mode 100644
index 00000000000..0e357d9d4d5
--- /dev/null
+++ b/src/test/ui/compile-fail-migration/trait-static-method-generic-inference.rs
@@ -0,0 +1,38 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Issue #3902. We are (at least currently) unable to infer `Self`
+// based on `T`, even though there is only a single impl, because of
+// the possibility of associated types and other things (basically: no
+// constraints on `Self` here at all).
+
+mod base {
+    pub trait HasNew<T> {
+        fn new() -> T;
+        fn dummy(&self) { }
+    }
+
+    pub struct Foo {
+        dummy: (),
+    }
+
+    impl HasNew<Foo> for Foo {
+        fn new() -> Foo {
+            Foo { dummy: () }
+        }
+    }
+}
+
+pub fn foo() {
+    let _f: base::Foo = base::HasNew::new();
+    //~^ ERROR type annotations required
+}
+
+fn main() { }