Print full Type::ResolvedPaths starting with Self

(e.g., `Self::Output`)

This doesn't actually "resugar" qualified paths like `<Self as
Foo>::Output`, it just doesn't elide the prefix segments when rendering
cleaned paths like `Self::Output`.

cc #21145

src/librustdoc/html/format.rs

@@ -460,7 +460,8 @@ impl fmt::Display for clean::Type {
                 f.write_str(name)
             }
             clean::ResolvedPath{ did, ref typarams, ref path } => {
-                try!(resolved_path(f, did, path, false));
+                // Paths like Self::Output should be rendered with all segments
+                try!(resolved_path(f, did, path, path.segments[0].name == "Self"));
                 tybounds(f, typarams)
             }
             clean::Infer => write!(f, "_"),

src/test/run-make/rustdoc-assoc-types/Makefile

@@ -0,0 +1,5 @@
+-include ../tools.mk
+
+all: lib.rs
+	$(HOST_RPATH_ENV) $(RUSTDOC) -w html -o $(TMPDIR)/doc lib.rs
+	$(HTMLDOCCK) $(TMPDIR)/doc lib.rs

src/test/run-make/rustdoc-assoc-types/lib.rs

@@ -0,0 +1,20 @@
+// 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.
+
+#![crate_type="lib"]
+
+// @has lib/trait.Index.html
+pub trait Index<I: ?Sized> {
+    // @has - '//*[@id="associatedtype.Output"]//code' 'type Output: ?Sized'
+    type Output: ?Sized;
+    // @has - '//*[@id="tymethod.index"]//code' \
+    //      "fn index<'a>(&'a self, index: I) -> &'a Self::Output"
+    fn index<'a>(&'a self, index: I) -> &'a Self::Output;
+}