---

yaml
---
r: 182171
b: refs/heads/beta
c: ff6085f
h: refs/heads/master
i:
  182169: c42011b
  182167: e03e695
v: v3

Author: nikomatsakis

[refs]

@@ -31,7 +31,7 @@ refs/heads/automation-fail: 1bf06495443584539b958873e04cc2f864ab10e4
 refs/heads/issue-18208-method-dispatch-3-quick-reject: 2009f85b9f99dedcec4404418eda9ddba90258a2
 refs/heads/batch: b7fd822592a4fb577552d93010c4a4e14f314346
 refs/heads/building: 126db549b038c84269a1e4fe46f051b2c15d6970
-refs/heads/beta: b92ec6a78a980b567ec8e6c034e3b37caea81aaa
+refs/heads/beta: ff6085f401844bc5cb07b804f0d2258bb5c2b9a8
 refs/heads/windistfix: 7608dbad651f02e837ed05eef3d74a6662a6e928
 refs/tags/1.0.0-alpha: e42bd6d93a1d3433c486200587f8f9e12590a4d7
 refs/heads/tmp: eb836bf767aa1d8d4cba488a9091cde3c0ab4b2f

branches/beta/src/librustc/middle/ty.rs

@@ -2604,12 +2604,17 @@ impl FlagComputation {
 
             &ty_projection(ref data) => {
                 self.add_flags(HAS_PROJECTION);
-                self.add_substs(data.trait_ref.substs);
+                self.add_projection_ty(data);
             }
 
             &ty_trait(box TyTrait { ref principal, ref bounds }) => {
                 let mut computation = FlagComputation::new();
                 computation.add_substs(principal.0.substs);
+                for projection_bound in bounds.projection_bounds.iter() {
+                    let mut proj_computation = FlagComputation::new();
+                    proj_computation.add_projection_predicate(&projection_bound.0);
+                    computation.add_bound_computation(&proj_computation);
+                }
                 self.add_bound_computation(&computation);
 
                 self.add_bounds(bounds);
@@ -2673,6 +2678,15 @@ impl FlagComputation {
         }
     }
 
+    fn add_projection_predicate(&mut self, projection_predicate: &ProjectionPredicate) {
+        self.add_projection_ty(&projection_predicate.projection_ty);
+        self.add_ty(projection_predicate.ty);
+    }
+
+    fn add_projection_ty(&mut self, projection_ty: &ProjectionTy) {
+        self.add_substs(projection_ty.trait_ref.substs);
+    }
+
     fn add_substs(&mut self, substs: &Substs) {
         self.add_tys(substs.types.as_slice());
         match substs.regions {

branches/beta/src/test/run-pass/associated-types-projection-in-object-type.rs

@@ -0,0 +1,43 @@
+// Copyright 2015 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.
+
+// Corrected regression test for #20831. The original did not compile.
+// When fixed, it revealed another problem concerning projections that
+// appear in associated type bindings in object types, which were not
+// being properly flagged.
+
+use std::ops::{Shl, Shr};
+use std::cell::RefCell;
+
+pub trait Subscriber {
+    type Input;
+}
+
+pub trait Publisher<'a> {
+    type Output;
+    fn subscribe(&mut self, Box<Subscriber<Input=Self::Output> + 'a>);
+}
+
+pub trait Processor<'a> : Subscriber + Publisher<'a> { }
+
+impl<'a, P> Processor<'a> for P where P : Subscriber + Publisher<'a> { }
+
+struct MyStruct<'a> {
+    sub: Box<Subscriber<Input=u64> + 'a>
+}
+
+impl<'a> Publisher<'a> for MyStruct<'a> {
+    type Output = u64;
+    fn subscribe(&mut self, t : Box<Subscriber<Input=u64> + 'a>) {
+        self.sub = t;
+    }
+}
+
+fn main() {}