Mutate DocContext from LibEmbargoVisitor and RustdocVisitor

We have &mut access, so remove the RefCell borrowing

src/librustdoc/clean/mod.rs

@@ -136,24 +136,22 @@ pub struct Crate {
     pub collapsed: bool,
 }
 
-pub fn krate(cx: &mut DocContext<'a>) -> Crate {
+pub fn krate(mut cx: &mut DocContext<'_>) -> Crate {
     use crate::visit_lib::LibEmbargoVisitor;
 
-    let v = crate::visit_ast::RustdocVisitor::new(&cx);
-    let module = v.visit(cx.tcx.hir().krate());
+    let krate = cx.tcx.hir().krate();
+    let module = crate::visit_ast::RustdocVisitor::new(&mut cx).visit(krate);
 
-    {
-        let mut r = cx.renderinfo.borrow_mut();
-        r.deref_trait_did = cx.tcx.lang_items().deref_trait();
-        r.deref_mut_trait_did = cx.tcx.lang_items().deref_mut_trait();
-        r.owned_box_did = cx.tcx.lang_items().owned_box();
-    }
+    let mut r = cx.renderinfo.get_mut();
+    r.deref_trait_did = cx.tcx.lang_items().deref_trait();
+    r.deref_mut_trait_did = cx.tcx.lang_items().deref_mut_trait();
+    r.owned_box_did = cx.tcx.lang_items().owned_box();
 
     let mut externs = Vec::new();
     for &cnum in cx.tcx.crates().iter() {
         externs.push((cnum, cnum.clean(cx)));
         // Analyze doc-reachability for extern items
-        LibEmbargoVisitor::new(cx).visit_lib(cnum);
+        LibEmbargoVisitor::new(&mut cx).visit_lib(cnum);
     }
     externs.sort_by(|&(a, _), &(b, _)| a.cmp(&b));
 

src/librustdoc/visit_ast.rs

@@ -41,7 +41,7 @@ fn def_id_to_path(
 // framework from syntax?.
 
 pub struct RustdocVisitor<'a, 'tcx> {
-    cx: &'a core::DocContext<'tcx>,
+    cx: &'a mut core::DocContext<'tcx>,
     view_item_stack: FxHashSet<hir::HirId>,
     inlining: bool,
     /// Are the current module and all of its parents public?
@@ -51,7 +51,7 @@ pub struct RustdocVisitor<'a, 'tcx> {
 
 impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
     pub fn new(
-        cx: &'a core::DocContext<'tcx>
+        cx: &'a mut core::DocContext<'tcx>
     ) -> RustdocVisitor<'a, 'tcx> {
         // If the root is re-exported, terminate all recursion.
         let mut stack = FxHashSet::default();
@@ -84,7 +84,7 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
         );
         module.is_crate = true;
 
-        self.cx.renderinfo.borrow_mut().exact_paths = self.exact_paths;
+        self.cx.renderinfo.get_mut().exact_paths = self.exact_paths;
 
         module
     }
@@ -292,7 +292,7 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
                 Res::Def(DefKind::ForeignTy, did) |
                 Res::Def(DefKind::TyAlias, did) if !self_is_hidden => {
                     self.cx.renderinfo
-                        .borrow_mut()
+                        .get_mut()
                         .access_levels.map
                         .insert(did, AccessLevel::Public);
                 },

src/librustdoc/visit_lib.rs

@@ -1,12 +1,10 @@
 use rustc::middle::privacy::{AccessLevels, AccessLevel};
 use rustc::hir::def::{Res, DefKind};
 use rustc::hir::def_id::{CrateNum, CRATE_DEF_INDEX, DefId};
-use rustc::ty::Visibility;
+use rustc::ty::{TyCtxt, Visibility};
 use rustc::util::nodemap::FxHashSet;
 use syntax::symbol::sym;
 
-use std::cell::RefMut;
-
 use crate::clean::{AttributesExt, NestedAttributesExt};
 
 // FIXME: this may not be exhaustive, but is sufficient for rustdocs current uses
@@ -14,9 +12,9 @@ use crate::clean::{AttributesExt, NestedAttributesExt};
 /// Similar to `librustc_privacy::EmbargoVisitor`, but also takes
 /// specific rustdoc annotations into account (i.e., `doc(hidden)`)
 pub struct LibEmbargoVisitor<'a, 'tcx> {
-    cx: &'a crate::core::DocContext<'tcx>,
+    tcx: TyCtxt<'tcx>,
     // Accessibility levels for reachable nodes
-    access_levels: RefMut<'a, AccessLevels<DefId>>,
+    access_levels: &'a mut AccessLevels<DefId>,
     // Previous accessibility level, None means unreachable
     prev_level: Option<AccessLevel>,
     // Keeps track of already visited modules, in case a module re-exports its parent
@@ -25,13 +23,13 @@ pub struct LibEmbargoVisitor<'a, 'tcx> {
 
 impl<'a, 'tcx> LibEmbargoVisitor<'a, 'tcx> {
     pub fn new(
-        cx: &'a crate::core::DocContext<'tcx>
+        cx: &'a mut crate::core::DocContext<'tcx>
     ) -> LibEmbargoVisitor<'a, 'tcx> {
         LibEmbargoVisitor {
-            cx,
-            access_levels: RefMut::map(cx.renderinfo.borrow_mut(), |ri| &mut ri.access_levels),
+            tcx: cx.tcx,
+            access_levels: &mut cx.renderinfo.get_mut().access_levels,
             prev_level: Some(AccessLevel::Public),
-            visited_mods: FxHashSet::default()
+            visited_mods: FxHashSet::default(),
         }
     }
 
@@ -43,7 +41,7 @@ impl<'a, 'tcx> LibEmbargoVisitor<'a, 'tcx> {
 
     // Updates node level and returns the updated level
     fn update(&mut self, did: DefId, level: Option<AccessLevel>) -> Option<AccessLevel> {
-        let is_hidden = self.cx.tcx.get_attrs(did).lists(sym::doc).has_word(sym::hidden);
+        let is_hidden = self.tcx.get_attrs(did).lists(sym::doc).has_word(sym::hidden);
 
         let old_level = self.access_levels.map.get(&did).cloned();
         // Accessibility levels can only grow
@@ -60,9 +58,9 @@ impl<'a, 'tcx> LibEmbargoVisitor<'a, 'tcx> {
             return;
         }
 
-        for item in self.cx.tcx.item_children(def_id).iter() {
+        for item in self.tcx.item_children(def_id).iter() {
             if let Some(def_id) = item.res.opt_def_id() {
-                if self.cx.tcx.def_key(def_id).parent.map_or(false, |d| d == def_id.index) ||
+                if self.tcx.def_key(def_id).parent.map_or(false, |d| d == def_id.index) ||
                     item.vis == Visibility::Public {
                     self.visit_item(item.res);
                 }
@@ -72,7 +70,7 @@ impl<'a, 'tcx> LibEmbargoVisitor<'a, 'tcx> {
 
     fn visit_item(&mut self, res: Res) {
         let def_id = res.def_id();
-        let vis = self.cx.tcx.visibility(def_id);
+        let vis = self.tcx.visibility(def_id);
         let inherited_item_level = if vis == Visibility::Public {
             self.prev_level
         } else {