erase lifetimes when translating specialized substs

Projections can generate lifetime variables with equality constraints,
that will not be resolved by `resolve_type_vars_if_possible`, so substs
need to be lifetime-erased after that.

Fixes #36848.

1 files changed, 41 insertions, 0 deletions

diff --git a/src/test/run-pass/specialization/specialization-translate-projections-with-lifetimes.rs b/src/test/run-pass/specialization/specialization-translate-projections-with-lifetimes.rs
new file mode 100644
index 00000000000..9702f632413
--- /dev/null
+++ b/src/test/run-pass/specialization/specialization-translate-projections-with-lifetimes.rs
@@ -0,0 +1,41 @@
+// Copyright 2016 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.
+
+#![feature(specialization)]
+
+trait Iterator {
+    fn next(&self);
+}
+
+trait WithAssoc {
+    type Item;
+}
+
+impl<'a> WithAssoc for &'a () {
+    type Item = &'a u32;
+}
+
+struct Cloned<I>(I);
+
+impl<'a, I, T: 'a> Iterator for Cloned<I>
+    where I: WithAssoc<Item=&'a T>, T: Clone
+{
+    fn next(&self) {}
+}
+
+impl<'a, I, T: 'a> Iterator for Cloned<I>
+    where I: WithAssoc<Item=&'a T>, T: Copy
+{
+
+}
+
+fn main() {
+    Cloned(&()).next();
+}