remove use of `ast_ty_to_ty_cache` from librustdoc

src/Cargo.lock

@@ -793,6 +793,7 @@ dependencies = [
  "rustc_metadata 0.0.0",
  "rustc_resolve 0.0.0",
  "rustc_trans 0.0.0",
+ "rustc_typeck 0.0.0",
  "serialize 0.0.0",
  "syntax 0.0.0",
  "syntax_pos 0.0.0",

src/librustdoc/Cargo.toml

@@ -21,6 +21,7 @@ rustc_errors = { path = "../librustc_errors" }
 rustc_lint = { path = "../librustc_lint" }
 rustc_metadata = { path = "../librustc_metadata" }
 rustc_resolve = { path = "../librustc_resolve" }
+rustc_typeck = { path = "../librustc_typeck" }
 rustc_trans = { path = "../librustc_trans" }
 serialize = { path = "../libserialize" }
 syntax = { path = "../libsyntax" }

src/librustdoc/clean/mod.rs

@@ -36,6 +36,7 @@ use rustc::ty::subst::Substs;
 use rustc::ty::{self, AdtKind};
 use rustc::middle::stability;
 use rustc::util::nodemap::{FxHashMap, FxHashSet};
+use rustc_typeck::hir_ty_to_ty;
 
 use rustc::hir;
 
@@ -1779,10 +1780,9 @@ impl Clean<Type> for hir::Ty {
             }
             TyPath(hir::QPath::TypeRelative(ref qself, ref segment)) => {
                 let mut def = Def::Err;
-                if let Some(ty) = cx.tcx.ast_ty_to_ty_cache.borrow().get(&self.id) {
-                    if let ty::TyProjection(proj) = ty.sty {
-                        def = Def::Trait(proj.trait_ref.def_id);
-                    }
+                let ty = hir_ty_to_ty(cx.tcx, self);
+                if let ty::TyProjection(proj) = ty.sty {
+                    def = Def::Trait(proj.trait_ref.def_id);
                 }
                 let trait_path = hir::Path {
                     span: self.span,

src/librustdoc/lib.rs

@@ -41,6 +41,7 @@ extern crate rustc_resolve;
 extern crate rustc_lint;
 extern crate rustc_back;
 extern crate rustc_metadata;
+extern crate rustc_typeck;
 extern crate serialize;
 #[macro_use] extern crate syntax;
 extern crate syntax_pos;