Rollup merge of rust-lang#64227 - alexreg:rush-pr-4, r=centril

Aggregation of cosmetic changes made during work on REPL PRs: librustc

Factored out from hacking on rustc for work on the REPL.

r? @Centril

Author: Centril

src/librustc/arena.rs

@@ -187,7 +187,7 @@ impl<T: Copy> ArenaAllocatable for T {}
 
 unsafe trait ArenaField<'tcx>: Sized {
     /// Returns a specific arena to allocate from.
-    /// If None is returned, the DropArena will be used.
+    /// If `None` is returned, the `DropArena` will be used.
     fn arena<'a>(arena: &'a Arena<'tcx>) -> Option<&'a TypedArena<Self>>;
 }
 

src/librustc/hir/check_attr.rs

@@ -4,13 +4,12 @@
 //! conflicts between multiple such attributes attached to the same
 //! item.
 
-
-use crate::ty::TyCtxt;
-use crate::ty::query::Providers;
-
 use crate::hir;
 use crate::hir::def_id::DefId;
 use crate::hir::intravisit::{self, Visitor, NestedVisitorMap};
+use crate::ty::TyCtxt;
+use crate::ty::query::Providers;
+
 use std::fmt::{self, Display};
 use syntax::symbol::sym;
 use syntax_pos::Span;

src/librustc/hir/def.rs

@@ -1,15 +1,17 @@
+use self::Namespace::*;
+
 use crate::hir::def_id::{DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
+use crate::hir;
+use crate::ty;
 use crate::util::nodemap::DefIdMap;
+
 use syntax::ast;
 use syntax::ext::base::MacroKind;
 use syntax::ast::NodeId;
 use syntax_pos::Span;
 use rustc_macros::HashStable;
-use crate::hir;
-use crate::ty;
-use std::fmt::Debug;
 
-use self::Namespace::*;
+use std::fmt::Debug;
 
 /// Encodes if a `DefKind::Ctor` is the constructor of an enum variant or a struct.
 #[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, HashStable)]
@@ -115,7 +117,7 @@ impl DefKind {
         }
     }
 
-    /// An English article for the def.
+    /// Gets an English article for the definition.
     pub fn article(&self) -> &'static str {
         match *self {
             DefKind::AssocTy
@@ -134,18 +136,22 @@ pub enum Res<Id = hir::HirId> {
     Def(DefKind, DefId),
 
     // Type namespace
+
     PrimTy(hir::PrimTy),
     SelfTy(Option<DefId> /* trait */, Option<DefId> /* impl */),
     ToolMod, // e.g., `rustfmt` in `#[rustfmt::skip]`
 
     // Value namespace
+
     SelfCtor(DefId /* impl */),  // `DefId` refers to the impl
     Local(Id),
 
     // Macro namespace
+
     NonMacroAttr(NonMacroAttrKind), // e.g., `#[inline]` or `#[rustfmt::skip]`
 
     // All namespaces
+
     Err,
 }
 
@@ -330,7 +336,7 @@ impl NonMacroAttrKind {
 }
 
 impl<Id> Res<Id> {
-    /// Return the `DefId` of this `Def` if it has an id, else panic.
+    /// Return the `DefId` of this `Def` if it has an ID, else panic.
     pub fn def_id(&self) -> DefId
     where
         Id: Debug,
@@ -340,7 +346,7 @@ impl<Id> Res<Id> {
         })
     }
 
-    /// Return `Some(..)` with the `DefId` of this `Res` if it has a id, else `None`.
+    /// Return `Some(..)` with the `DefId` of this `Res` if it has a ID, else `None`.
     pub fn opt_def_id(&self) -> Option<DefId> {
         match *self {
             Res::Def(_, id) => Some(id),
@@ -379,7 +385,7 @@ impl<Id> Res<Id> {
         }
     }
 
-    /// An English article for the res.
+    /// Gets an English article for the `Res`.
     pub fn article(&self) -> &'static str {
         match *self {
             Res::Def(kind, _) => kind.article(),

src/librustc/hir/def_id.rs

@@ -11,7 +11,7 @@ newtype_index! {
 
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub enum CrateNum {
-    /// A special CrateNum that we use for the tcx.rcache when decoding from
+    /// A special `CrateNum` that we use for the `tcx.rcache` when decoding from
     /// the incr. comp. cache.
     ReservedForIncrCompCache,
     Index(CrateId),
@@ -26,11 +26,10 @@ impl ::std::fmt::Debug for CrateNum {
     }
 }
 
-/// Item definitions in the currently-compiled crate would have the CrateNum
-/// LOCAL_CRATE in their DefId.
+/// Item definitions in the currently-compiled crate would have the `CrateNum`
+/// `LOCAL_CRATE` in their `DefId`.
 pub const LOCAL_CRATE: CrateNum = CrateNum::Index(CrateId::from_u32_const(0));
 
-
 impl Idx for CrateNum {
     #[inline]
     fn new(value: usize) -> Self {

src/librustc/hir/intravisit.rs

@@ -31,11 +31,13 @@
 //! This order consistency is required in a few places in rustc, for
 //! example generator inference, and possibly also HIR borrowck.
 
-use syntax::ast::{Ident, Name, Attribute};
-use syntax_pos::Span;
+use super::itemlikevisit::DeepVisitor;
+
 use crate::hir::*;
 use crate::hir::map::Map;
-use super::itemlikevisit::DeepVisitor;
+
+use syntax::ast::{Ident, Name, Attribute};
+use syntax_pos::Span;
 
 #[derive(Copy, Clone)]
 pub enum FnKind<'a> {
@@ -139,7 +141,7 @@ impl<'this, 'tcx> NestedVisitorMap<'this, 'tcx> {
 /// explicitly, you need to override each method. (And you also need
 /// to monitor future changes to `Visitor` in case a new method with a
 /// new default implementation gets introduced.)
-pub trait Visitor<'v> : Sized {
+pub trait Visitor<'v>: Sized {
     ///////////////////////////////////////////////////////////////////////////
     // Nested items.
 
@@ -162,8 +164,8 @@ pub trait Visitor<'v> : Sized {
     fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'v>;
 
     /// Invoked when a nested item is encountered. By default does
-    /// nothing unless you override `nested_visit_map` to return
-    /// `Some(_)`, in which case it will walk the item. **You probably
+    /// nothing unless you override `nested_visit_map` to return other than
+    /// `None`, in which case it will walk the item. **You probably
     /// don't want to override this method** -- instead, override
     /// `nested_visit_map` or use the "shallow" or "deep" visit
     /// patterns described on `itemlikevisit::ItemLikeVisitor`. The only
@@ -201,8 +203,8 @@ pub trait Visitor<'v> : Sized {
 
     /// Invoked to visit the body of a function, method or closure. Like
     /// visit_nested_item, does nothing by default unless you override
-    /// `nested_visit_map` to return `Some(_)`, in which case it will walk the
-    /// body.
+    /// `nested_visit_map` to return other htan `None`, in which case it will walk
+    /// the body.
     fn visit_nested_body(&mut self, id: BodyId) {
         let opt_body = self.nested_visit_map().intra().map(|map| map.body(id));
         if let Some(body) = opt_body {
@@ -603,7 +605,7 @@ pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty) {
             visitor.visit_lifetime(lifetime);
             visitor.visit_ty(&mutable_type.ty)
         }
-        TyKind::Never => {},
+        TyKind::Never => {}
         TyKind::Tup(ref tuple_element_types) => {
             walk_list!(visitor, visit_ty, tuple_element_types);
         }

src/librustc/hir/itemlikevisit.rs

@@ -1,7 +1,7 @@
 use super::{Item, ImplItem, TraitItem};
 use super::intravisit::Visitor;
 
-/// The "item-like visitor" visitor defines only the top-level methods
+/// The "item-like visitor" defines only the top-level methods
 /// that can be invoked by `Crate::visit_all_item_likes()`. Whether
 /// this trait is the right one to implement will depend on the
 /// overall pattern you need. Here are the three available patterns,
@@ -18,22 +18,21 @@ use super::intravisit::Visitor;
 ///    an item, but don't care about how item-like things are nested
 ///    within one another.
 ///    - Example: Examine each expression to look for its type and do some check or other.
-///    - How: Implement `intravisit::Visitor` and use
-///      `tcx.hir().krate().visit_all_item_likes(visitor.as_deep_visitor())`. Within
-///      your `intravisit::Visitor` impl, implement methods like
-///      `visit_expr()`; don't forget to invoke
-///      `intravisit::walk_visit_expr()` to keep walking the subparts.
+///    - How: Implement `intravisit::Visitor` and override the `nested_visit_map()` method
+///      to return `NestedVisitorMap::OnlyBodies` and use
+///      `tcx.hir().krate().visit_all_item_likes(&mut visitor.as_deep_visitor())`. Within
+///      your `intravisit::Visitor` impl, implement methods like `visit_expr()` (don't forget
+///      to invoke `intravisit::walk_expr()` to keep walking the subparts).
 ///    - Pro: Visitor methods for any kind of HIR node, not just item-like things.
 ///    - Pro: Integrates well into dependency tracking.
 ///    - Con: Don't get information about nesting between items
 /// 3. **Nested visit**: Want to visit the whole HIR and you care about the nesting between
 ///    item-like things.
 ///    - Example: Lifetime resolution, which wants to bring lifetimes declared on the
 ///      impl into scope while visiting the impl-items, and then back out again.
-///    - How: Implement `intravisit::Visitor` and override the
-///      `nested_visit_map()` methods to return
-///      `NestedVisitorMap::All`. Walk your crate with
-///      `intravisit::walk_crate()` invoked on `tcx.hir().krate()`.
+///    - How: Implement `intravisit::Visitor` and override the `nested_visit_map()` method
+///      to return `NestedVisitorMap::All`. Walk your crate with `intravisit::walk_crate()`
+///      invoked on `tcx.hir().krate()`.
 ///    - Pro: Visitor methods for any kind of HIR node, not just item-like things.
 ///    - Pro: Preserves nesting information
 ///    - Con: Does not integrate well into dependency tracking.
@@ -79,7 +78,7 @@ impl<'v, 'hir, V> ItemLikeVisitor<'hir> for DeepVisitor<'v, V>
     }
 }
 
-/// A parallel variant of ItemLikeVisitor
+/// A parallel variant of `ItemLikeVisitor`.
 pub trait ParItemLikeVisitor<'hir> {
     fn visit_item(&self, item: &'hir Item);
     fn visit_trait_item(&self, trait_item: &'hir TraitItem);

src/librustc/hir/lowering.rs

@@ -79,7 +79,7 @@ const HIR_ID_COUNTER_LOCKED: u32 = 0xFFFFFFFF;
 pub struct LoweringContext<'a> {
     crate_root: Option<Symbol>,
 
-    /// Used to assign ids to HIR nodes that do not directly correspond to an AST node.
+    /// Used to assign IDs to HIR nodes that do not directly correspond to AST nodes.
     sess: &'a Session,
 
     cstore: &'a dyn CrateStore,
@@ -126,7 +126,7 @@ pub struct LoweringContext<'a> {
     /// lifetime definitions in the corresponding impl or function generics.
     lifetimes_to_define: Vec<(Span, ParamName)>,
 
-    /// Whether or not in-band lifetimes are being collected. This is used to
+    /// `true` if in-band lifetimes are being collected. This is used to
     /// indicate whether or not we're in a place where new lifetimes will result
     /// in in-band lifetime definitions, such a function or an impl header,
     /// including implicit lifetimes from `impl_header_lifetime_elision`.
@@ -154,13 +154,13 @@ pub struct LoweringContext<'a> {
 }
 
 pub trait Resolver {
-    /// Obtain resolution for a `NodeId` with a single resolution.
+    /// Obtains resolution for a `NodeId` with a single resolution.
     fn get_partial_res(&mut self, id: NodeId) -> Option<PartialRes>;
 
-    /// Obtain per-namespace resolutions for `use` statement with the given `NoedId`.
+    /// Obtains per-namespace resolutions for `use` statement with the given `NodeId`.
     fn get_import_res(&mut self, id: NodeId) -> PerNS<Option<Res<NodeId>>>;
 
-    /// Obtain resolution for a label with the given `NodeId`.
+    /// Obtains resolution for a label with the given `NodeId`.
     fn get_label_res(&mut self, id: NodeId) -> Option<NodeId>;
 
     /// We must keep the set of definitions up to date as we add nodes that weren't in the AST.
@@ -699,7 +699,7 @@ impl<'a> LoweringContext<'a> {
     fn lower_res(&mut self, res: Res<NodeId>) -> Res {
         res.map_id(|id| {
             self.lower_node_id_generic(id, |_| {
-                panic!("expected node_id to be lowered already for res {:#?}", res)
+                panic!("expected `NodeId` to be lowered already for res {:#?}", res);
             })
         })
     }
@@ -1364,7 +1364,7 @@ impl<'a> LoweringContext<'a> {
                     }
                 }
             }
-            TyKind::Mac(_) => bug!("`TyMac` should have been expanded by now."),
+            TyKind::Mac(_) => bug!("`TyMac` should have been expanded by now"),
             TyKind::CVarArgs => {
                 // Create the implicit lifetime of the "spoofed" `VaListImpl`.
                 let span = self.sess.source_map().next_point(t.span.shrink_to_lo());
@@ -2999,7 +2999,7 @@ impl<'a> LoweringContext<'a> {
             }
             StmtKind::Expr(ref e) => hir::StmtKind::Expr(P(self.lower_expr(e))),
             StmtKind::Semi(ref e) => hir::StmtKind::Semi(P(self.lower_expr(e))),
-            StmtKind::Mac(..) => panic!("Shouldn't exist here"),
+            StmtKind::Mac(..) => panic!("shouldn't exist here"),
         };
         smallvec![hir::Stmt {
             hir_id: self.lower_node_id(s.id),
@@ -3187,7 +3187,7 @@ impl<'a> LoweringContext<'a> {
 
         hir::Path {
             span,
-            res: res.map_id(|_| panic!("unexpected node_id")),
+            res: res.map_id(|_| panic!("unexpected `NodeId`")),
             segments: segments.into(),
         }
     }

src/librustc/hir/lowering/item.rs

@@ -718,7 +718,7 @@ impl LoweringContext<'_> {
                         AnonymousLifetimeMode::PassThrough,
                         |this, _| {
                             (
-                                // Disallow impl Trait in foreign items
+                                // Disallow `impl Trait` in foreign items.
                                 this.lower_fn_decl(fdec, None, false, None),
                                 this.lower_fn_params_to_names(fdec),
                             )
@@ -732,7 +732,7 @@ impl LoweringContext<'_> {
                         self.lower_ty(t, ImplTraitContext::disallowed()), self.lower_mutability(m))
                 }
                 ForeignItemKind::Ty => hir::ForeignItemKind::Type,
-                ForeignItemKind::Macro(_) => panic!("shouldn't exist here"),
+                ForeignItemKind::Macro(_) => panic!("macro shouldn't exist here"),
             },
             vis: self.lower_visibility(&i.vis, None),
             span: i.span,

src/librustc/hir/map/collector.rs

@@ -340,7 +340,7 @@ impl<'a, 'hir> Visitor<'hir> for NodeCollector<'a, 'hir> {
     /// their outer items.
 
     fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'hir> {
-        panic!("visit_nested_xxx must be manually implemented in this visitor")
+        panic!("`visit_nested_xxx` must be manually implemented in this visitor");
     }
 
     fn visit_nested_item(&mut self, item: ItemId) {