Move `ast::Item::ident` into `ast::ItemKind`.

`ast::Item` has an `ident` field.

- It's always non-empty for these item kinds: `ExternCrate`, `Static`,
  `Const`, `Fn`, `Mod`, `TyAlias`, `Enum`, `Struct`, `Union`,
  `Trait`, `TraitAlias`, `MacroDef`, `Delegation`.

- It's always empty for these item kinds: `Use`, `ForeignMod`,
  `GlobalAsm`, `Impl`, `MacCall`, `DelegationMac`.

There is a similar story for `AssocItemKind` and `ForeignItemKind`.

Some sites that handle items check for an empty ident, some don't. This
is a very C-like way of doing things, but this is Rust, we have sum
types, we can do this properly and never forget to check for the
exceptional case and never YOLO possibly empty identifiers (or possibly
dummy spans) around and hope that things will work out.

The commit is large but it's mostly obvious plumbing work. Some notable
things.

- `ast::Item` got 8 bytes bigger. This could be avoided by boxing the
  fields within some of the `ast::ItemKind` variants (specifically:
  `Struct`, `Union`, `Enum`). I might do that in a follow-up; this
  commit is big enough already.

- For the visitors: `FnKind` no longer needs an `ident` field because
  the `Fn` within how has one.

- In the parser, the `ItemInfo` typedef is no longer needed. It was used
  in various places to return an `Ident` alongside an `ItemKind`, but
  now the `Ident` (if present) is within the `ItemKind`.

- In a few places I renamed identifier variables called `name` (or
  `foo_name`) as `ident` (or `foo_ident`), to better match the type, and
  because `name` is normally used for `Symbol`s. It's confusing to see
  something like `foo_name.name`.

4 files changed, 83 insertions, 74 deletions

diff --git a/src/tools/rustfmt/src/items.rs b/src/tools/rustfmt/src/items.rs
index fdda885b729..322af97d9dc 100644
--- a/src/tools/rustfmt/src/items.rs
+++ b/src/tools/rustfmt/src/items.rs
@@ -333,12 +333,12 @@ impl<'a> FnSig<'a> {
         defaultness: ast::Defaultness,
     ) -> FnSig<'a> {
         match *fn_kind {
-            visit::FnKind::Fn(visit::FnCtxt::Assoc(..), _, vis, ast::Fn { sig, generics, .. }) => {
+            visit::FnKind::Fn(visit::FnCtxt::Assoc(..), vis, ast::Fn { sig, generics, .. }) => {
                 let mut fn_sig = FnSig::from_method_sig(sig, generics, vis);
                 fn_sig.defaultness = defaultness;
                 fn_sig
             }
-            visit::FnKind::Fn(_, _, vis, ast::Fn { sig, generics, .. }) => FnSig {
+            visit::FnKind::Fn(_, vis, ast::Fn { sig, generics, .. }) => FnSig {
                 decl,
                 generics,
                 ext: sig.header.ext,
@@ -750,11 +750,10 @@ impl<'a> FmtVisitor<'a> {
                 (Type(lty), Type(rty))
                     if both_type(&lty.ty, &rty.ty) || both_opaque(&lty.ty, &rty.ty) =>
                 {
-                    a.ident.as_str().cmp(b.ident.as_str())
-                }
-                (Const(..), Const(..)) | (MacCall(..), MacCall(..)) => {
-                    a.ident.as_str().cmp(b.ident.as_str())
+                    lty.ident.as_str().cmp(rty.ident.as_str())
                 }
+                (Const(ca), Const(cb)) => ca.ident.as_str().cmp(cb.ident.as_str()),
+                (MacCall(..), MacCall(..)) => Ordering::Equal,
                 (Fn(..), Fn(..)) | (Delegation(..), Delegation(..)) => {
                     a.span.lo().cmp(&b.span.lo())
                 }
@@ -1105,14 +1104,16 @@ impl<'a> StructParts<'a> {
     }
 
     pub(crate) fn from_item(item: &'a ast::Item) -> Self {
-        let (prefix, def, generics) = match item.kind {
-            ast::ItemKind::Struct(ref def, ref generics) => ("struct ", def, generics),
-            ast::ItemKind::Union(ref def, ref generics) => ("union ", def, generics),
+        let (prefix, def, ident, generics) = match item.kind {
+            ast::ItemKind::Struct(ident, ref def, ref generics) => {
+                ("struct ", def, ident, generics)
+            }
+            ast::ItemKind::Union(ident, ref def, ref generics) => ("union ", def, ident, generics),
             _ => unreachable!(),
         };
         StructParts {
             prefix,
-            ident: item.ident,
+            ident,
             vis: &item.vis,
             def,
             generics: Some(generics),
@@ -1168,6 +1169,7 @@ pub(crate) fn format_trait(
     let ast::Trait {
         is_auto,
         safety,
+        ident,
         ref generics,
         ref bounds,
         ref items,
@@ -1186,13 +1188,13 @@ pub(crate) fn format_trait(
 
     let shape = Shape::indented(offset, context.config).offset_left(result.len())?;
     let generics_str =
-        rewrite_generics(context, rewrite_ident(context, item.ident), generics, shape).ok()?;
+        rewrite_generics(context, rewrite_ident(context, ident), generics, shape).ok()?;
     result.push_str(&generics_str);
 
     // FIXME(#2055): rustfmt fails to format when there are comments between trait bounds.
     if !bounds.is_empty() {
         // Retrieve *unnormalized* ident (See #6069)
-        let source_ident = context.snippet(item.ident.span);
+        let source_ident = context.snippet(ident.span);
         let ident_hi = context.snippet_provider.span_after(item.span, source_ident);
         let bound_hi = bounds.last().unwrap().span().hi();
         let snippet = context.snippet(mk_sp(ident_hi, bound_hi));
@@ -1699,7 +1701,6 @@ struct TyAliasRewriteInfo<'c, 'g>(
 pub(crate) fn rewrite_type_alias<'a>(
     ty_alias_kind: &ast::TyAlias,
     vis: &ast::Visibility,
-    ident: Ident,
     context: &RewriteContext<'a>,
     indent: Indent,
     visitor_kind: ItemVisitorKind,
@@ -1709,6 +1710,7 @@ pub(crate) fn rewrite_type_alias<'a>(
 
     let ast::TyAlias {
         defaultness,
+        ident,
         ref generics,
         ref bounds,
         ref ty,
@@ -2022,14 +2024,23 @@ pub(crate) struct StaticParts<'a> {
 
 impl<'a> StaticParts<'a> {
     pub(crate) fn from_item(item: &'a ast::Item) -> Self {
-        let (defaultness, prefix, safety, ty, mutability, expr, generics) = match &item.kind {
-            ast::ItemKind::Static(s) => {
-                (None, "static", s.safety, &s.ty, s.mutability, &s.expr, None)
-            }
+        let (defaultness, prefix, safety, ident, ty, mutability, expr, generics) = match &item.kind
+        {
+            ast::ItemKind::Static(s) => (
+                None,
+                "static",
+                s.safety,
+                s.ident,
+                &s.ty,
+                s.mutability,
+                &s.expr,
+                None,
+            ),
             ast::ItemKind::Const(c) => (
                 Some(c.defaultness),
                 "const",
                 ast::Safety::Default,
+                c.ident,
                 &c.ty,
                 ast::Mutability::Not,
                 &c.expr,
@@ -2041,7 +2052,7 @@ impl<'a> StaticParts<'a> {
             prefix,
             safety,
             vis: &item.vis,
-            ident: item.ident,
+            ident,
             generics,
             ty,
             mutability,
@@ -2051,7 +2062,7 @@ impl<'a> StaticParts<'a> {
         }
     }
 
-    pub(crate) fn from_trait_item(ti: &'a ast::AssocItem) -> Self {
+    pub(crate) fn from_trait_item(ti: &'a ast::AssocItem, ident: Ident) -> Self {
         let (defaultness, ty, expr_opt, generics) = match &ti.kind {
             ast::AssocItemKind::Const(c) => (c.defaultness, &c.ty, &c.expr, Some(&c.generics)),
             _ => unreachable!(),
@@ -2060,7 +2071,7 @@ impl<'a> StaticParts<'a> {
             prefix: "const",
             safety: ast::Safety::Default,
             vis: &ti.vis,
-            ident: ti.ident,
+            ident,
             generics,
             ty,
             mutability: ast::Mutability::Not,
@@ -2070,7 +2081,7 @@ impl<'a> StaticParts<'a> {
         }
     }
 
-    pub(crate) fn from_impl_item(ii: &'a ast::AssocItem) -> Self {
+    pub(crate) fn from_impl_item(ii: &'a ast::AssocItem, ident: Ident) -> Self {
         let (defaultness, ty, expr, generics) = match &ii.kind {
             ast::AssocItemKind::Const(c) => (c.defaultness, &c.ty, &c.expr, Some(&c.generics)),
             _ => unreachable!(),
@@ -2079,7 +2090,7 @@ impl<'a> StaticParts<'a> {
             prefix: "const",
             safety: ast::Safety::Default,
             vis: &ii.vis,
-            ident: ii.ident,
+            ident,
             generics,
             ty,
             mutability: ast::Mutability::Not,
@@ -3440,6 +3451,7 @@ impl Rewrite for ast::ForeignItem {
                 let ast::Fn {
                     defaultness,
                     ref sig,
+                    ident,
                     ref generics,
                     ref body,
                     ..
@@ -3451,7 +3463,8 @@ impl Rewrite for ast::ForeignItem {
                     let inner_attrs = inner_attributes(&self.attrs);
                     let fn_ctxt = visit::FnCtxt::Foreign;
                     visitor.visit_fn(
-                        visit::FnKind::Fn(fn_ctxt, &self.ident, &self.vis, fn_kind),
+                        ident,
+                        visit::FnKind::Fn(fn_ctxt, &self.vis, fn_kind),
                         &sig.decl,
                         self.span,
                         defaultness,
@@ -3462,7 +3475,7 @@ impl Rewrite for ast::ForeignItem {
                     rewrite_fn_base(
                         context,
                         shape.indent,
-                        self.ident,
+                        ident,
                         &FnSig::from_method_sig(sig, generics, &self.vis),
                         span,
                         FnBraceStyle::None,
@@ -3481,7 +3494,7 @@ impl Rewrite for ast::ForeignItem {
                     vis,
                     safety,
                     mut_str,
-                    rewrite_ident(context, self.ident)
+                    rewrite_ident(context, static_foreign_item.ident)
                 );
                 // 1 = ;
                 rewrite_assign_rhs(
@@ -3497,15 +3510,7 @@ impl Rewrite for ast::ForeignItem {
             }
             ast::ForeignItemKind::TyAlias(ref ty_alias) => {
                 let kind = ItemVisitorKind::ForeignItem;
-                rewrite_type_alias(
-                    ty_alias,
-                    &self.vis,
-                    self.ident,
-                    context,
-                    shape.indent,
-                    kind,
-                    self.span,
-                )
+                rewrite_type_alias(ty_alias, &self.vis, context, shape.indent, kind, self.span)
             }
             ast::ForeignItemKind::MacCall(ref mac) => {
                 rewrite_macro(mac, context, shape, MacroPosition::Item)
@@ -3568,12 +3573,13 @@ fn rewrite_attrs(
 pub(crate) fn rewrite_mod(
     context: &RewriteContext<'_>,
     item: &ast::Item,
+    ident: Ident,
     attrs_shape: Shape,
 ) -> Option<String> {
     let mut result = String::with_capacity(32);
     result.push_str(&*format_visibility(context, &item.vis));
     result.push_str("mod ");
-    result.push_str(rewrite_ident(context, item.ident));
+    result.push_str(rewrite_ident(context, ident));
     result.push(';');
     rewrite_attrs(context, item, &result, attrs_shape)
 }
@@ -3600,7 +3606,7 @@ pub(crate) fn rewrite_extern_crate(
 pub(crate) fn is_mod_decl(item: &ast::Item) -> bool {
     !matches!(
         item.kind,
-        ast::ItemKind::Mod(_, ast::ModKind::Loaded(_, ast::Inline::Yes, _, _))
+        ast::ItemKind::Mod(_, _, ast::ModKind::Loaded(_, ast::Inline::Yes, _, _))
     )
 }
 
diff --git a/src/tools/rustfmt/src/modules.rs b/src/tools/rustfmt/src/modules.rs
index a40ee7f66a9..bc5a6d3e704 100644
--- a/src/tools/rustfmt/src/modules.rs
+++ b/src/tools/rustfmt/src/modules.rs
@@ -152,7 +152,7 @@ impl<'ast, 'psess, 'c> ModResolver<'ast, 'psess> {
         let mut visitor = visitor::CfgIfVisitor::new(self.psess);
         visitor.visit_item(&item);
         for module_item in visitor.mods() {
-            if let ast::ItemKind::Mod(_, ref sub_mod_kind) = module_item.item.kind {
+            if let ast::ItemKind::Mod(_, _, ref sub_mod_kind) = module_item.item.kind {
                 self.visit_sub_mod(
                     &module_item.item,
                     Module::new(
@@ -178,7 +178,7 @@ impl<'ast, 'psess, 'c> ModResolver<'ast, 'psess> {
                 continue;
             }
 
-            if let ast::ItemKind::Mod(_, ref sub_mod_kind) = item.kind {
+            if let ast::ItemKind::Mod(_, _, ref sub_mod_kind) = item.kind {
                 let span = item.span;
                 self.visit_sub_mod(
                     &item,
@@ -204,7 +204,7 @@ impl<'ast, 'psess, 'c> ModResolver<'ast, 'psess> {
                 self.visit_cfg_if(Cow::Borrowed(item))?;
             }
 
-            if let ast::ItemKind::Mod(_, ref sub_mod_kind) = item.kind {
+            if let ast::ItemKind::Mod(_, _, ref sub_mod_kind) = item.kind {
                 let span = item.span;
                 self.visit_sub_mod(
                     item,
@@ -248,7 +248,7 @@ impl<'ast, 'psess, 'c> ModResolver<'ast, 'psess> {
         if is_mod_decl(item) {
             // mod foo;
             // Look for an extern file.
-            self.find_external_module(item.ident, &item.attrs, sub_mod)
+            self.find_external_module(item.kind.ident().unwrap(), &item.attrs, sub_mod)
         } else {
             // An internal module (`mod foo { /* ... */ }`);
             Ok(Some(SubModKind::Internal(item)))
@@ -291,7 +291,7 @@ impl<'ast, 'psess, 'c> ModResolver<'ast, 'psess> {
                 self.visit_sub_mod_after_directory_update(sub_mod, Some(directory))
             }
             SubModKind::Internal(item) => {
-                self.push_inline_mod_directory(item.ident, &item.attrs);
+                self.push_inline_mod_directory(item.kind.ident().unwrap(), &item.attrs);
                 self.visit_sub_mod_after_directory_update(sub_mod, None)
             }
             SubModKind::MultiExternal(mods) => {
diff --git a/src/tools/rustfmt/src/reorder.rs b/src/tools/rustfmt/src/reorder.rs
index 8a31e0ac816..2460b61698c 100644
--- a/src/tools/rustfmt/src/reorder.rs
+++ b/src/tools/rustfmt/src/reorder.rs
@@ -25,14 +25,17 @@ use crate::visitor::FmtVisitor;
 /// Choose the ordering between the given two items.
 fn compare_items(a: &ast::Item, b: &ast::Item) -> Ordering {
     match (&a.kind, &b.kind) {
-        (&ast::ItemKind::Mod(..), &ast::ItemKind::Mod(..)) => {
-            a.ident.as_str().cmp(b.ident.as_str())
+        (&ast::ItemKind::Mod(_, a_ident, _), &ast::ItemKind::Mod(_, b_ident, _)) => {
+            a_ident.as_str().cmp(b_ident.as_str())
         }
-        (&ast::ItemKind::ExternCrate(ref a_name), &ast::ItemKind::ExternCrate(ref b_name)) => {
+        (
+            &ast::ItemKind::ExternCrate(ref a_name, a_ident),
+            &ast::ItemKind::ExternCrate(ref b_name, b_ident),
+        ) => {
             // `extern crate foo as bar;`
             //               ^^^ Comparing this.
-            let a_orig_name = a_name.unwrap_or(a.ident.name);
-            let b_orig_name = b_name.unwrap_or(b.ident.name);
+            let a_orig_name = a_name.unwrap_or(a_ident.name);
+            let b_orig_name = b_name.unwrap_or(b_ident.name);
             let result = a_orig_name.as_str().cmp(b_orig_name.as_str());
             if result != Ordering::Equal {
                 return result;
@@ -44,7 +47,7 @@ fn compare_items(a: &ast::Item, b: &ast::Item) -> Ordering {
                 (Some(..), None) => Ordering::Greater,
                 (None, Some(..)) => Ordering::Less,
                 (None, None) => Ordering::Equal,
-                (Some(..), Some(..)) => a.ident.as_str().cmp(b.ident.as_str()),
+                (Some(..), Some(..)) => a_ident.as_str().cmp(b_ident.as_str()),
             }
         }
         _ => unreachable!(),
@@ -69,7 +72,7 @@ fn rewrite_reorderable_item(
 ) -> Option<String> {
     match item.kind {
         ast::ItemKind::ExternCrate(..) => rewrite_extern_crate(context, item, shape),
-        ast::ItemKind::Mod(..) => rewrite_mod(context, item, shape),
+        ast::ItemKind::Mod(_, ident, _) => rewrite_mod(context, item, ident, shape),
         _ => None,
     }
 }
diff --git a/src/tools/rustfmt/src/visitor.rs b/src/tools/rustfmt/src/visitor.rs
index c73976d90b1..1dc0a906923 100644
--- a/src/tools/rustfmt/src/visitor.rs
+++ b/src/tools/rustfmt/src/visitor.rs
@@ -377,6 +377,7 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
     // on traits do not get handled here.
     pub(crate) fn visit_fn(
         &mut self,
+        ident: Ident,
         fk: visit::FnKind<'_>,
         fd: &ast::FnDecl,
         s: Span,
@@ -388,7 +389,6 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
         let rewrite = match fk {
             visit::FnKind::Fn(
                 _,
-                ident,
                 _,
                 ast::Fn {
                     body: Some(ref b), ..
@@ -397,7 +397,7 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
                 block = b;
                 self.rewrite_fn_before_block(
                     indent,
-                    *ident,
+                    ident,
                     &FnSig::from_fn_kind(&fk, fd, defaultness),
                     mk_sp(s.lo(), b.span.lo()),
                 )
@@ -444,7 +444,7 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
 
         let should_visit_node_again = match item.kind {
             // For use/extern crate items, skip rewriting attributes but check for a skip attribute.
-            ast::ItemKind::Use(..) | ast::ItemKind::ExternCrate(_) => {
+            ast::ItemKind::Use(..) | ast::ItemKind::ExternCrate(..) => {
                 if contains_skip(attrs) {
                     self.push_skipped_with_span(attrs.as_slice(), item.span(), item.span());
                     false
@@ -497,11 +497,11 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
                     let rw = self.with_context(|ctx| format_trait(ctx, item, block_indent));
                     self.push_rewrite(item.span, rw);
                 }
-                ast::ItemKind::TraitAlias(ref generics, ref generic_bounds) => {
+                ast::ItemKind::TraitAlias(ident, ref generics, ref generic_bounds) => {
                     let shape = Shape::indented(self.block_indent, self.config);
                     let rw = format_trait_alias(
                         &self.get_context(),
-                        item.ident,
+                        ident,
                         &item.vis,
                         generics,
                         generic_bounds,
@@ -509,7 +509,7 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
                     );
                     self.push_rewrite(item.span, rw);
                 }
-                ast::ItemKind::ExternCrate(_) => {
+                ast::ItemKind::ExternCrate(..) => {
                     let rw = rewrite_extern_crate(&self.get_context(), item, self.shape());
                     let span = if attrs.is_empty() {
                         item.span
@@ -521,14 +521,14 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
                 ast::ItemKind::Struct(..) | ast::ItemKind::Union(..) => {
                     self.visit_struct(&StructParts::from_item(item));
                 }
-                ast::ItemKind::Enum(ref def, ref generics) => {
+                ast::ItemKind::Enum(ident, ref def, ref generics) => {
                     self.format_missing_with_indent(source!(self, item.span).lo());
-                    self.visit_enum(item.ident, &item.vis, def, generics, item.span);
+                    self.visit_enum(ident, &item.vis, def, generics, item.span);
                     self.last_pos = source!(self, item.span).hi();
                 }
-                ast::ItemKind::Mod(safety, ref mod_kind) => {
+                ast::ItemKind::Mod(safety, ident, ref mod_kind) => {
                     self.format_missing_with_indent(source!(self, item.span).lo());
-                    self.format_mod(mod_kind, safety, &item.vis, item.span, item.ident, attrs);
+                    self.format_mod(mod_kind, safety, &item.vis, item.span, ident, attrs);
                 }
                 ast::ItemKind::MacCall(ref mac) => {
                     self.visit_mac(mac, MacroPosition::Item);
@@ -544,6 +544,7 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
                     let ast::Fn {
                         defaultness,
                         ref sig,
+                        ident,
                         ref generics,
                         ref body,
                         ..
@@ -555,7 +556,8 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
                             _ => visit::FnCtxt::Foreign,
                         };
                         self.visit_fn(
-                            visit::FnKind::Fn(fn_ctxt, &item.ident, &item.vis, fn_kind),
+                            ident,
+                            visit::FnKind::Fn(fn_ctxt, &item.vis, fn_kind),
                             &sig.decl,
                             item.span,
                             defaultness,
@@ -564,28 +566,26 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
                     } else {
                         let indent = self.block_indent;
                         let rewrite = self
-                            .rewrite_required_fn(
-                                indent, item.ident, sig, &item.vis, generics, item.span,
-                            )
+                            .rewrite_required_fn(indent, ident, sig, &item.vis, generics, item.span)
                             .ok();
                         self.push_rewrite(item.span, rewrite);
                     }
                 }
                 ast::ItemKind::TyAlias(ref ty_alias) => {
                     use ItemVisitorKind::Item;
-                    self.visit_ty_alias_kind(ty_alias, &item.vis, item.ident, Item, item.span);
+                    self.visit_ty_alias_kind(ty_alias, &item.vis, Item, item.span);
                 }
                 ast::ItemKind::GlobalAsm(..) => {
                     let snippet = Some(self.snippet(item.span).to_owned());
                     self.push_rewrite(item.span, snippet);
                 }
-                ast::ItemKind::MacroDef(ref def) => {
+                ast::ItemKind::MacroDef(ident, ref def) => {
                     let rewrite = rewrite_macro_def(
                         &self.get_context(),
                         self.shape(),
                         self.block_indent,
                         def,
-                        item.ident,
+                        ident,
                         &item.vis,
                         item.span,
                     )
@@ -606,14 +606,12 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
         &mut self,
         ty_kind: &ast::TyAlias,
         vis: &ast::Visibility,
-        ident: Ident,
         visitor_kind: ItemVisitorKind,
         span: Span,
     ) {
         let rewrite = rewrite_type_alias(
             ty_kind,
             vis,
-            ident,
             &self.get_context(),
             self.block_indent,
             visitor_kind,
@@ -642,16 +640,17 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
 
         // TODO(calebcartwright): consider enabling box_patterns feature gate
         match (&ai.kind, visitor_kind) {
-            (ast::AssocItemKind::Const(..), AssocTraitItem) => {
-                self.visit_static(&StaticParts::from_trait_item(ai))
+            (ast::AssocItemKind::Const(c), AssocTraitItem) => {
+                self.visit_static(&StaticParts::from_trait_item(ai, c.ident))
             }
-            (ast::AssocItemKind::Const(..), AssocImplItem) => {
-                self.visit_static(&StaticParts::from_impl_item(ai))
+            (ast::AssocItemKind::Const(c), AssocImplItem) => {
+                self.visit_static(&StaticParts::from_impl_item(ai, c.ident))
             }
             (ast::AssocItemKind::Fn(ref fn_kind), _) => {
                 let ast::Fn {
                     defaultness,
                     ref sig,
+                    ident,
                     ref generics,
                     ref body,
                     ..
@@ -660,7 +659,8 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
                     let inner_attrs = inner_attributes(&ai.attrs);
                     let fn_ctxt = visit::FnCtxt::Assoc(assoc_ctxt);
                     self.visit_fn(
-                        visit::FnKind::Fn(fn_ctxt, &ai.ident, &ai.vis, fn_kind),
+                        ident,
+                        visit::FnKind::Fn(fn_ctxt, &ai.vis, fn_kind),
                         &sig.decl,
                         ai.span,
                         defaultness,
@@ -669,13 +669,13 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
                 } else {
                     let indent = self.block_indent;
                     let rewrite = self
-                        .rewrite_required_fn(indent, ai.ident, sig, &ai.vis, generics, ai.span)
+                        .rewrite_required_fn(indent, fn_kind.ident, sig, &ai.vis, generics, ai.span)
                         .ok();
                     self.push_rewrite(ai.span, rewrite);
                 }
             }
             (ast::AssocItemKind::Type(ref ty_alias), _) => {
-                self.visit_ty_alias_kind(ty_alias, &ai.vis, ai.ident, visitor_kind, ai.span);
+                self.visit_ty_alias_kind(ty_alias, &ai.vis, visitor_kind, ai.span);
             }
             (ast::AssocItemKind::MacCall(ref mac), _) => {
                 self.visit_mac(mac, MacroPosition::Item);