Merging upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 138 insertions, 136 deletions

diff --git a/compiler/rustc_ast_pretty/src/pprust/state.rs b/compiler/rustc_ast_pretty/src/pprust/state.rs
index b87c6f78d..d3d8431c1 100644
--- a/compiler/rustc_ast_pretty/src/pprust/state.rs
+++ b/compiler/rustc_ast_pretty/src/pprust/state.rs
@@ -11,16 +11,15 @@ use rustc_ast::tokenstream::{TokenStream, TokenTree};
 use rustc_ast::util::classify;
 use rustc_ast::util::comments::{gather_comments, Comment, CommentStyle};
 use rustc_ast::util::parser;
-use rustc_ast::{self as ast, BlockCheckMode, Mutability, PatKind, RangeEnd, RangeSyntax};
-use rustc_ast::{attr, BindingAnnotation, ByRef, Term};
-use rustc_ast::{GenericArg, MacArgs, MacArgsEq};
-use rustc_ast::{GenericBound, SelfKind, TraitBoundModifier};
+use rustc_ast::{self as ast, AttrArgs, AttrArgsEq, BlockCheckMode, PatKind};
+use rustc_ast::{attr, BindingAnnotation, ByRef, DelimArgs, RangeEnd, RangeSyntax, Term};
+use rustc_ast::{GenericArg, GenericBound, SelfKind, TraitBoundModifier};
 use rustc_ast::{InlineAsmOperand, InlineAsmRegOrRegClass};
 use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
 use rustc_span::edition::Edition;
 use rustc_span::source_map::{SourceMap, Spanned};
 use rustc_span::symbol::{kw, sym, Ident, IdentPrinter, Symbol};
-use rustc_span::{BytePos, FileName, Span};
+use rustc_span::{BytePos, FileName, Span, DUMMY_SP};
 
 use rustc_ast::attr::AttrIdGenerator;
 use std::borrow::Cow;
@@ -65,6 +64,7 @@ impl<'a> Comments<'a> {
         Comments { sm, comments, current: 0 }
     }
 
+    // FIXME: This shouldn't probably clone lmao
     pub fn next(&self) -> Option<Comment> {
         self.comments.get(self.current).cloned()
     }
@@ -120,17 +120,20 @@ pub fn print_crate<'a>(
         // of the feature gate, so we fake them up here.
 
         // `#![feature(prelude_import)]`
-        let pi_nested = attr::mk_nested_word_item(Ident::with_dummy_span(sym::prelude_import));
-        let list = attr::mk_list_item(Ident::with_dummy_span(sym::feature), vec![pi_nested]);
-        let fake_attr = attr::mk_attr_inner(g, list);
+        let fake_attr = attr::mk_attr_nested_word(
+            g,
+            ast::AttrStyle::Inner,
+            sym::feature,
+            sym::prelude_import,
+            DUMMY_SP,
+        );
         s.print_attribute(&fake_attr);
 
         // Currently, in Rust 2018 we don't have `extern crate std;` at the crate
         // root, so this is not needed, and actually breaks things.
         if edition == Edition::Edition2015 {
             // `#![no_std]`
-            let no_std_meta = attr::mk_word_item(Ident::with_dummy_span(sym::no_std));
-            let fake_attr = attr::mk_attr_inner(g, no_std_meta);
+            let fake_attr = attr::mk_attr_word(g, ast::AttrStyle::Inner, sym::no_std, DUMMY_SP);
             s.print_attribute(&fake_attr);
         }
     }
@@ -269,10 +272,10 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
 
     fn maybe_print_comment(&mut self, pos: BytePos) -> bool {
         let mut has_comment = false;
-        while let Some(ref cmnt) = self.next_comment() {
+        while let Some(cmnt) = self.next_comment() {
             if cmnt.pos < pos {
                 has_comment = true;
-                self.print_comment(cmnt);
+                self.print_comment(&cmnt);
             } else {
                 break;
             }
@@ -367,14 +370,18 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
         if self.next_comment().is_none() {
             self.hardbreak();
         }
-        while let Some(ref cmnt) = self.next_comment() {
-            self.print_comment(cmnt)
+        while let Some(cmnt) = self.next_comment() {
+            self.print_comment(&cmnt)
         }
     }
 
-    fn print_literal(&mut self, lit: &ast::Lit) {
-        self.maybe_print_comment(lit.span.lo());
-        self.word(lit.token_lit.to_string())
+    fn print_meta_item_lit(&mut self, lit: &ast::MetaItemLit) {
+        self.print_token_literal(lit.token_lit, lit.span)
+    }
+
+    fn print_token_literal(&mut self, token_lit: token::Lit, span: Span) {
+        self.maybe_print_comment(span.lo());
+        self.word(token_lit.to_string())
     }
 
     fn print_string(&mut self, st: &str, style: ast::StrStyle) {
@@ -443,8 +450,8 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
             self.hardbreak_if_not_bol();
         }
         self.maybe_print_comment(attr.span.lo());
-        match attr.kind {
-            ast::AttrKind::Normal(ref normal) => {
+        match &attr.kind {
+            ast::AttrKind::Normal(normal) => {
                 match attr.style {
                     ast::AttrStyle::Inner => self.word("#!["),
                     ast::AttrStyle::Outer => self.word("#["),
@@ -453,7 +460,7 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
                 self.word("]");
             }
             ast::AttrKind::DocComment(comment_kind, data) => {
-                self.word(doc_comment_to_string(comment_kind, attr.style, data));
+                self.word(doc_comment_to_string(*comment_kind, attr.style, *data));
                 self.hardbreak()
             }
         }
@@ -462,30 +469,30 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
     fn print_attr_item(&mut self, item: &ast::AttrItem, span: Span) {
         self.ibox(0);
         match &item.args {
-            MacArgs::Delimited(_, delim, tokens) => self.print_mac_common(
+            AttrArgs::Delimited(DelimArgs { dspan: _, delim, tokens }) => self.print_mac_common(
                 Some(MacHeader::Path(&item.path)),
                 false,
                 None,
-                Some(delim.to_token()),
+                delim.to_token(),
                 tokens,
                 true,
                 span,
             ),
-            MacArgs::Empty => {
+            AttrArgs::Empty => {
                 self.print_path(&item.path, false, 0);
             }
-            MacArgs::Eq(_, MacArgsEq::Ast(expr)) => {
+            AttrArgs::Eq(_, AttrArgsEq::Ast(expr)) => {
                 self.print_path(&item.path, false, 0);
                 self.space();
                 self.word_space("=");
                 let token_str = self.expr_to_string(expr);
                 self.word(token_str);
             }
-            MacArgs::Eq(_, MacArgsEq::Hir(lit)) => {
+            AttrArgs::Eq(_, AttrArgsEq::Hir(lit)) => {
                 self.print_path(&item.path, false, 0);
                 self.space();
                 self.word_space("=");
-                let token_str = self.literal_to_string(lit);
+                let token_str = self.meta_item_lit_to_string(lit);
                 self.word(token_str);
             }
         }
@@ -494,25 +501,25 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
 
     fn print_meta_list_item(&mut self, item: &ast::NestedMetaItem) {
         match item {
-            ast::NestedMetaItem::MetaItem(ref mi) => self.print_meta_item(mi),
-            ast::NestedMetaItem::Literal(ref lit) => self.print_literal(lit),
+            ast::NestedMetaItem::MetaItem(mi) => self.print_meta_item(mi),
+            ast::NestedMetaItem::Lit(lit) => self.print_meta_item_lit(lit),
         }
     }
 
     fn print_meta_item(&mut self, item: &ast::MetaItem) {
         self.ibox(INDENT_UNIT);
-        match item.kind {
+        match &item.kind {
             ast::MetaItemKind::Word => self.print_path(&item.path, false, 0),
-            ast::MetaItemKind::NameValue(ref value) => {
+            ast::MetaItemKind::NameValue(value) => {
                 self.print_path(&item.path, false, 0);
                 self.space();
                 self.word_space("=");
-                self.print_literal(value);
+                self.print_meta_item_lit(value);
             }
-            ast::MetaItemKind::List(ref items) => {
+            ast::MetaItemKind::List(items) => {
                 self.print_path(&item.path, false, 0);
                 self.popen();
-                self.commasep(Consistent, &items, |s, i| s.print_meta_list_item(i));
+                self.commasep(Consistent, items, |s, i| s.print_meta_list_item(i));
                 self.pclose();
             }
         }
@@ -529,7 +536,7 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
     fn print_tt(&mut self, tt: &TokenTree, convert_dollar_crate: bool) {
         match tt {
             TokenTree::Token(token, _) => {
-                let token_str = self.token_to_string_ext(&token, convert_dollar_crate);
+                let token_str = self.token_to_string_ext(token, convert_dollar_crate);
                 self.word(token_str);
                 if let token::DocComment(..) = token.kind {
                     self.hardbreak()
@@ -540,7 +547,7 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
                     None,
                     false,
                     None,
-                    Some(*delim),
+                    *delim,
                     tts,
                     convert_dollar_crate,
                     dspan.entire(),
@@ -566,12 +573,12 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
         header: Option<MacHeader<'_>>,
         has_bang: bool,
         ident: Option<Ident>,
-        delim: Option<Delimiter>,
+        delim: Delimiter,
         tts: &TokenStream,
         convert_dollar_crate: bool,
         span: Span,
     ) {
-        if delim == Some(Delimiter::Brace) {
+        if delim == Delimiter::Brace {
             self.cbox(INDENT_UNIT);
         }
         match header {
@@ -587,7 +594,7 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
             self.print_ident(ident);
         }
         match delim {
-            Some(Delimiter::Brace) => {
+            Delimiter::Brace => {
                 if header.is_some() || has_bang || ident.is_some() {
                     self.nbsp();
                 }
@@ -601,7 +608,7 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
                 let empty = tts.is_empty();
                 self.bclose(span, empty);
             }
-            Some(delim) => {
+            delim => {
                 let token_str = self.token_kind_to_string(&token::OpenDelim(delim));
                 self.word(token_str);
                 self.ibox(0);
@@ -610,11 +617,6 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
                 let token_str = self.token_kind_to_string(&token::CloseDelim(delim));
                 self.word(token_str);
             }
-            None => {
-                self.ibox(0);
-                self.print_tts(tts, convert_dollar_crate);
-                self.end();
-            }
         }
     }
 
@@ -635,8 +637,8 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
             Some(MacHeader::Keyword(kw)),
             has_bang,
             Some(*ident),
-            macro_def.body.delim(),
-            &macro_def.body.inner_tokens(),
+            macro_def.body.delim.to_token(),
+            &macro_def.body.tokens.clone(),
             true,
             sp,
         );
@@ -659,7 +661,7 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
     fn print_path_segment(&mut self, segment: &ast::PathSegment, colons_before_params: bool) {
         if segment.ident.name != kw::PathRoot {
             self.print_ident(segment.ident);
-            if let Some(ref args) = segment.args {
+            if let Some(args) = &segment.args {
                 self.print_generic_args(args, colons_before_params);
             }
         }
@@ -714,19 +716,19 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
     }
 
     fn nonterminal_to_string(&self, nt: &Nonterminal) -> String {
-        match *nt {
-            token::NtExpr(ref e) => self.expr_to_string(e),
-            token::NtMeta(ref e) => self.attr_item_to_string(e),
-            token::NtTy(ref e) => self.ty_to_string(e),
-            token::NtPath(ref e) => self.path_to_string(e),
-            token::NtItem(ref e) => self.item_to_string(e),
-            token::NtBlock(ref e) => self.block_to_string(e),
-            token::NtStmt(ref e) => self.stmt_to_string(e),
-            token::NtPat(ref e) => self.pat_to_string(e),
-            token::NtIdent(e, is_raw) => IdentPrinter::for_ast_ident(e, is_raw).to_string(),
+        match nt {
+            token::NtExpr(e) => self.expr_to_string(e),
+            token::NtMeta(e) => self.attr_item_to_string(e),
+            token::NtTy(e) => self.ty_to_string(e),
+            token::NtPath(e) => self.path_to_string(e),
+            token::NtItem(e) => self.item_to_string(e),
+            token::NtBlock(e) => self.block_to_string(e),
+            token::NtStmt(e) => self.stmt_to_string(e),
+            token::NtPat(e) => self.pat_to_string(e),
+            token::NtIdent(e, is_raw) => IdentPrinter::for_ast_ident(*e, *is_raw).to_string(),
             token::NtLifetime(e) => e.to_string(),
-            token::NtLiteral(ref e) => self.expr_to_string(e),
-            token::NtVis(ref e) => self.vis_to_string(e),
+            token::NtLiteral(e) => self.expr_to_string(e),
+            token::NtVis(e) => self.vis_to_string(e),
         }
     }
 
@@ -827,8 +829,8 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
         Self::to_string(|s| s.print_expr(e))
     }
 
-    fn literal_to_string(&self, lit: &ast::Lit) -> String {
-        Self::to_string(|s| s.print_literal(lit))
+    fn meta_item_lit_to_string(&self, lit: &ast::MetaItemLit) -> String {
+        Self::to_string(|s| s.print_meta_item_lit(lit))
     }
 
     fn tt_to_string(&self, tt: &TokenTree) -> String {
@@ -919,8 +921,8 @@ impl<'a> PrintState<'a> for State<'a> {
             self.word("::")
         }
 
-        match *args {
-            ast::GenericArgs::AngleBracketed(ref data) => {
+        match args {
+            ast::GenericArgs::AngleBracketed(data) => {
                 self.word("<");
                 self.commasep(Inconsistent, &data.args, |s, arg| match arg {
                     ast::AngleBracketedArg::Arg(a) => s.print_generic_arg(a),
@@ -929,7 +931,7 @@ impl<'a> PrintState<'a> for State<'a> {
                 self.word(">")
             }
 
-            ast::GenericArgs::Parenthesized(ref data) => {
+            ast::GenericArgs::Parenthesized(data) => {
                 self.word("(");
                 self.commasep(Inconsistent, &data.inputs, |s, ty| s.print_type(ty));
                 self.word(")");
@@ -996,7 +998,7 @@ impl<'a> State<'a> {
             ast::AssocConstraintKind::Bound { bounds } => {
                 if !bounds.is_empty() {
                     self.word_nbsp(":");
-                    self.print_type_bounds(&bounds);
+                    self.print_type_bounds(bounds);
                 }
             }
         }
@@ -1013,17 +1015,17 @@ impl<'a> State<'a> {
     pub fn print_type(&mut self, ty: &ast::Ty) {
         self.maybe_print_comment(ty.span.lo());
         self.ibox(0);
-        match ty.kind {
-            ast::TyKind::Slice(ref ty) => {
+        match &ty.kind {
+            ast::TyKind::Slice(ty) => {
                 self.word("[");
                 self.print_type(ty);
                 self.word("]");
             }
-            ast::TyKind::Ptr(ref mt) => {
+            ast::TyKind::Ptr(mt) => {
                 self.word("*");
                 self.print_mt(mt, true);
             }
-            ast::TyKind::Rptr(ref lifetime, ref mt) => {
+            ast::TyKind::Rptr(lifetime, mt) => {
                 self.word("&");
                 self.print_opt_lifetime(lifetime);
                 self.print_mt(mt, false);
@@ -1031,44 +1033,44 @@ impl<'a> State<'a> {
             ast::TyKind::Never => {
                 self.word("!");
             }
-            ast::TyKind::Tup(ref elts) => {
+            ast::TyKind::Tup(elts) => {
                 self.popen();
-                self.commasep(Inconsistent, &elts, |s, ty| s.print_type(ty));
+                self.commasep(Inconsistent, elts, |s, ty| s.print_type(ty));
                 if elts.len() == 1 {
                     self.word(",");
                 }
                 self.pclose();
             }
-            ast::TyKind::Paren(ref typ) => {
+            ast::TyKind::Paren(typ) => {
                 self.popen();
                 self.print_type(typ);
                 self.pclose();
             }
-            ast::TyKind::BareFn(ref f) => {
+            ast::TyKind::BareFn(f) => {
                 self.print_ty_fn(f.ext, f.unsafety, &f.decl, None, &f.generic_params);
             }
-            ast::TyKind::Path(None, ref path) => {
+            ast::TyKind::Path(None, path) => {
                 self.print_path(path, false, 0);
             }
-            ast::TyKind::Path(Some(ref qself), ref path) => self.print_qpath(path, qself, false),
-            ast::TyKind::TraitObject(ref bounds, syntax) => {
-                if syntax == ast::TraitObjectSyntax::Dyn {
+            ast::TyKind::Path(Some(qself), path) => self.print_qpath(path, qself, false),
+            ast::TyKind::TraitObject(bounds, syntax) => {
+                if *syntax == ast::TraitObjectSyntax::Dyn {
                     self.word_nbsp("dyn");
                 }
                 self.print_type_bounds(bounds);
             }
-            ast::TyKind::ImplTrait(_, ref bounds) => {
+            ast::TyKind::ImplTrait(_, bounds) => {
                 self.word_nbsp("impl");
                 self.print_type_bounds(bounds);
             }
-            ast::TyKind::Array(ref ty, ref length) => {
+            ast::TyKind::Array(ty, length) => {
                 self.word("[");
                 self.print_type(ty);
                 self.word("; ");
                 self.print_expr(&length.value);
                 self.word("]");
             }
-            ast::TyKind::Typeof(ref e) => {
+            ast::TyKind::Typeof(e) => {
                 self.word("typeof(");
                 self.print_expr(&e.value);
                 self.word(")");
@@ -1084,7 +1086,7 @@ impl<'a> State<'a> {
             ast::TyKind::ImplicitSelf => {
                 self.word("Self");
             }
-            ast::TyKind::MacCall(ref m) => {
+            ast::TyKind::MacCall(m) => {
                 self.print_mac(m);
             }
             ast::TyKind::CVarArgs => {
@@ -1113,8 +1115,8 @@ impl<'a> State<'a> {
 
     pub(crate) fn print_stmt(&mut self, st: &ast::Stmt) {
         self.maybe_print_comment(st.span.lo());
-        match st.kind {
-            ast::StmtKind::Local(ref loc) => {
+        match &st.kind {
+            ast::StmtKind::Local(loc) => {
                 self.print_outer_attributes(&loc.attrs);
                 self.space_if_not_bol();
                 self.ibox(INDENT_UNIT);
@@ -1137,15 +1139,15 @@ impl<'a> State<'a> {
                 self.word(";");
                 self.end(); // `let` ibox
             }
-            ast::StmtKind::Item(ref item) => self.print_item(item),
-            ast::StmtKind::Expr(ref expr) => {
+            ast::StmtKind::Item(item) => self.print_item(item),
+            ast::StmtKind::Expr(expr) => {
                 self.space_if_not_bol();
                 self.print_expr_outer_attr_style(expr, false);
                 if classify::expr_requires_semi_to_be_stmt(expr) {
                     self.word(";");
                 }
             }
-            ast::StmtKind::Semi(ref expr) => {
+            ast::StmtKind::Semi(expr) => {
                 self.space_if_not_bol();
                 self.print_expr_outer_attr_style(expr, false);
                 self.word(";");
@@ -1154,7 +1156,7 @@ impl<'a> State<'a> {
                 self.space_if_not_bol();
                 self.word(";");
             }
-            ast::StmtKind::MacCall(ref mac) => {
+            ast::StmtKind::MacCall(mac) => {
                 self.space_if_not_bol();
                 self.print_outer_attributes(&mac.attrs);
                 self.print_mac(&mac.mac);
@@ -1195,8 +1197,8 @@ impl<'a> State<'a> {
         let has_attrs = self.print_inner_attributes(attrs);
 
         for (i, st) in blk.stmts.iter().enumerate() {
-            match st.kind {
-                ast::StmtKind::Expr(ref expr) if i == blk.stmts.len() - 1 => {
+            match &st.kind {
+                ast::StmtKind::Expr(expr) if i == blk.stmts.len() - 1 => {
                     self.maybe_print_comment(st.span.lo());
                     self.space_if_not_bol();
                     self.print_expr_outer_attr_style(expr, false);
@@ -1226,8 +1228,8 @@ impl<'a> State<'a> {
             Some(MacHeader::Path(&m.path)),
             true,
             None,
-            m.args.delim(),
-            &m.args.inner_tokens(),
+            m.args.delim.to_token(),
+            &m.args.tokens.clone(),
             true,
             m.span(),
         );
@@ -1252,7 +1254,7 @@ impl<'a> State<'a> {
 
         self.popen();
         self.commasep(Consistent, &args, |s, arg| match arg {
-            AsmArg::Template(template) => s.print_string(&template, ast::StrStyle::Cooked),
+            AsmArg::Template(template) => s.print_string(template, ast::StrStyle::Cooked),
             AsmArg::Operand(op) => {
                 let print_reg_or_class = |s: &mut Self, r: &InlineAsmRegOrRegClass| match r {
                     InlineAsmRegOrRegClass::Reg(r) => s.print_symbol(*r, ast::StrStyle::Cooked),
@@ -1364,7 +1366,7 @@ impl<'a> State<'a> {
 
     pub(crate) fn print_local_decl(&mut self, loc: &ast::Local) {
         self.print_pat(&loc.pat);
-        if let Some(ref ty) = loc.ty {
+        if let Some(ty) = &loc.ty {
             self.word_space(":");
             self.print_type(ty);
         }
@@ -1388,7 +1390,7 @@ impl<'a> State<'a> {
         for item_segment in &path.segments[qself.position..] {
             self.word("::");
             self.print_ident(item_segment.ident);
-            if let Some(ref args) = item_segment.args {
+            if let Some(args) = &item_segment.args {
                 self.print_generic_args(args, colons_before_params)
             }
         }
@@ -1399,42 +1401,42 @@ impl<'a> State<'a> {
         self.ann.pre(self, AnnNode::Pat(pat));
         /* Pat isn't normalized, but the beauty of it
         is that it doesn't matter */
-        match pat.kind {
+        match &pat.kind {
             PatKind::Wild => self.word("_"),
-            PatKind::Ident(BindingAnnotation(by_ref, mutbl), ident, ref sub) => {
-                if by_ref == ByRef::Yes {
+            PatKind::Ident(BindingAnnotation(by_ref, mutbl), ident, sub) => {
+                if *by_ref == ByRef::Yes {
                     self.word_nbsp("ref");
                 }
-                if mutbl == Mutability::Mut {
+                if mutbl.is_mut() {
                     self.word_nbsp("mut");
                 }
-                self.print_ident(ident);
-                if let Some(ref p) = *sub {
+                self.print_ident(*ident);
+                if let Some(p) = sub {
                     self.space();
                     self.word_space("@");
                     self.print_pat(p);
                 }
             }
-            PatKind::TupleStruct(ref qself, ref path, ref elts) => {
+            PatKind::TupleStruct(qself, path, elts) => {
                 if let Some(qself) = qself {
                     self.print_qpath(path, qself, true);
                 } else {
                     self.print_path(path, true, 0);
                 }
                 self.popen();
-                self.commasep(Inconsistent, &elts, |s, p| s.print_pat(p));
+                self.commasep(Inconsistent, elts, |s, p| s.print_pat(p));
                 self.pclose();
             }
-            PatKind::Or(ref pats) => {
-                self.strsep("|", true, Inconsistent, &pats, |s, p| s.print_pat(p));
+            PatKind::Or(pats) => {
+                self.strsep("|", true, Inconsistent, pats, |s, p| s.print_pat(p));
             }
-            PatKind::Path(None, ref path) => {
+            PatKind::Path(None, path) => {
                 self.print_path(path, true, 0);
             }
-            PatKind::Path(Some(ref qself), ref path) => {
+            PatKind::Path(Some(qself), path) => {
                 self.print_qpath(path, qself, false);
             }
-            PatKind::Struct(ref qself, ref path, ref fields, etc) => {
+            PatKind::Struct(qself, path, fields, etc) => {
                 if let Some(qself) = qself {
                     self.print_qpath(path, qself, true);
                 } else {
@@ -1448,7 +1450,7 @@ impl<'a> State<'a> {
                 }
                 self.commasep_cmnt(
                     Consistent,
-                    &fields,
+                    fields,
                     |s, f| {
                         s.cbox(INDENT_UNIT);
                         if !f.is_shorthand {
@@ -1460,7 +1462,7 @@ impl<'a> State<'a> {
                     },
                     |f| f.pat.span,
                 );
-                if etc {
+                if *etc {
                     if !fields.is_empty() {
                         self.word_space(",");
                     }
@@ -1471,21 +1473,21 @@ impl<'a> State<'a> {
                 }
                 self.word("}");
             }
-            PatKind::Tuple(ref elts) => {
+            PatKind::Tuple(elts) => {
                 self.popen();
-                self.commasep(Inconsistent, &elts, |s, p| s.print_pat(p));
+                self.commasep(Inconsistent, elts, |s, p| s.print_pat(p));
                 if elts.len() == 1 {
                     self.word(",");
                 }
                 self.pclose();
             }
-            PatKind::Box(ref inner) => {
+            PatKind::Box(inner) => {
                 self.word("box ");
                 self.print_pat(inner);
             }
-            PatKind::Ref(ref inner, mutbl) => {
+            PatKind::Ref(inner, mutbl) => {
                 self.word("&");
-                if mutbl == Mutability::Mut {
+                if mutbl.is_mut() {
                     self.word("mut ");
                 }
                 if let PatKind::Ident(ast::BindingAnnotation::MUT, ..) = inner.kind {
@@ -1496,12 +1498,12 @@ impl<'a> State<'a> {
                     self.print_pat(inner);
                 }
             }
-            PatKind::Lit(ref e) => self.print_expr(&**e),
-            PatKind::Range(ref begin, ref end, Spanned { node: ref end_kind, .. }) => {
+            PatKind::Lit(e) => self.print_expr(e),
+            PatKind::Range(begin, end, Spanned { node: end_kind, .. }) => {
                 if let Some(e) = begin {
                     self.print_expr(e);
                 }
-                match *end_kind {
+                match end_kind {
                     RangeEnd::Included(RangeSyntax::DotDotDot) => self.word("..."),
                     RangeEnd::Included(RangeSyntax::DotDotEq) => self.word("..="),
                     RangeEnd::Excluded => self.word(".."),
@@ -1510,36 +1512,36 @@ impl<'a> State<'a> {
                     self.print_expr(e);
                 }
             }
-            PatKind::Slice(ref elts) => {
+            PatKind::Slice(elts) => {
                 self.word("[");
-                self.commasep(Inconsistent, &elts, |s, p| s.print_pat(p));
+                self.commasep(Inconsistent, elts, |s, p| s.print_pat(p));
                 self.word("]");
             }
             PatKind::Rest => self.word(".."),
-            PatKind::Paren(ref inner) => {
+            PatKind::Paren(inner) => {
                 self.popen();
                 self.print_pat(inner);
                 self.pclose();
             }
-            PatKind::MacCall(ref m) => self.print_mac(m),
+            PatKind::MacCall(m) => self.print_mac(m),
         }
         self.ann.post(self, AnnNode::Pat(pat))
     }
 
     fn print_explicit_self(&mut self, explicit_self: &ast::ExplicitSelf) {
-        match explicit_self.node {
+        match &explicit_self.node {
             SelfKind::Value(m) => {
-                self.print_mutability(m, false);
+                self.print_mutability(*m, false);
                 self.word("self")
             }
-            SelfKind::Region(ref lt, m) => {
+            SelfKind::Region(lt, m) => {
                 self.word("&");
                 self.print_opt_lifetime(lt);
-                self.print_mutability(m, false);
+                self.print_mutability(*m, false);
                 self.word("self")
             }
-            SelfKind::Explicit(ref typ, m) => {
-                self.print_mutability(m, false);
+            SelfKind::Explicit(typ, m) => {
+                self.print_mutability(*m, false);
                 self.word("self");
                 self.word_space(":");
                 self.print_type(typ)
@@ -1598,10 +1600,10 @@ impl<'a> State<'a> {
 
         self.word("<");
 
-        self.commasep(Inconsistent, &generic_params, |s, param| {
+        self.commasep(Inconsistent, generic_params, |s, param| {
             s.print_outer_attributes_inline(&param.attrs);
 
-            match param.kind {
+            match &param.kind {
                 ast::GenericParamKind::Lifetime => {
                     let lt = ast::Lifetime { id: param.id, ident: param.ident };
                     s.print_lifetime(lt);
@@ -1610,19 +1612,19 @@ impl<'a> State<'a> {
                         s.print_lifetime_bounds(&param.bounds)
                     }
                 }
-                ast::GenericParamKind::Type { ref default } => {
+                ast::GenericParamKind::Type { default } => {
                     s.print_ident(param.ident);
                     if !param.bounds.is_empty() {
                         s.word_nbsp(":");
                         s.print_type_bounds(&param.bounds);
                     }
-                    if let Some(ref default) = default {
+                    if let Some(default) = default {
                         s.space();
                         s.word_space("=");
                         s.print_type(default)
                     }
                 }
-                ast::GenericParamKind::Const { ref ty, kw_span: _, ref default } => {
+                ast::GenericParamKind::Const { ty, default, .. } => {
                     s.word_space("const");
                     s.print_ident(param.ident);
                     s.space();
@@ -1632,7 +1634,7 @@ impl<'a> State<'a> {
                         s.word_nbsp(":");
                         s.print_type_bounds(&param.bounds);
                     }
-                    if let Some(ref default) = default {
+                    if let Some(default) = default {
                         s.space();
                         s.word_space("=");
                         s.print_expr(&default.value);
@@ -1714,9 +1716,9 @@ impl<'a> State<'a> {
             where_clause: ast::WhereClause {
                 has_where_token: false,
                 predicates: Vec::new(),
-                span: rustc_span::DUMMY_SP,
+                span: DUMMY_SP,
             },
-            span: rustc_span::DUMMY_SP,
+            span: DUMMY_SP,
         };
         let header = ast::FnHeader { unsafety, ext, ..ast::FnHeader::default() };
         self.print_fn(decl, header, name, &generics);
@@ -1735,7 +1737,7 @@ impl<'a> State<'a> {
             }
             ast::Extern::Explicit(abi, _) => {
                 self.word_nbsp("extern");
-                self.print_literal(&abi.as_lit());
+                self.print_token_literal(abi.as_token_lit(), abi.span);
                 self.nbsp();
             }
         }