1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Functions dealing with attributes and meta items
15 pub use self::builtin::{
16 cfg_matches, contains_feature_attr, eval_condition, find_crate_name, find_deprecation,
17 find_repr_attrs, find_stability, find_unwind_attr, Deprecation, InlineAttr, IntType, ReprAttr,
18 RustcConstUnstable, RustcDeprecation, Stability, StabilityLevel, UnwindAttr,
20 pub use self::IntType::*;
21 pub use self::ReprAttr::*;
22 pub use self::StabilityLevel::*;
25 use ast::{AttrId, Attribute, Name, Ident, Path, PathSegment};
26 use ast::{MetaItem, MetaItemKind, NestedMetaItem, NestedMetaItemKind};
27 use ast::{Lit, LitKind, Expr, ExprKind, Item, Local, Stmt, StmtKind, GenericParam};
28 use codemap::{BytePos, Spanned, respan, dummy_spanned};
30 use parse::lexer::comments::{doc_comment_style, strip_doc_comment_decoration};
31 use parse::parser::Parser;
32 use parse::{self, ParseSess, PResult};
33 use parse::token::{self, Token};
36 use tokenstream::{TokenStream, TokenTree, Delimited};
42 pub fn mark_used(attr: &Attribute) {
43 debug!("Marking {:?} as used.", attr);
44 let AttrId(id) = attr.id;
45 GLOBALS.with(|globals| {
46 let mut slot = globals.used_attrs.lock();
47 let idx = (id / 64) as usize;
49 if slot.len() <= idx {
50 slot.resize(idx + 1, 0);
52 slot[idx] |= 1 << shift;
56 pub fn is_used(attr: &Attribute) -> bool {
57 let AttrId(id) = attr.id;
58 GLOBALS.with(|globals| {
59 let slot = globals.used_attrs.lock();
60 let idx = (id / 64) as usize;
62 slot.get(idx).map(|bits| bits & (1 << shift) != 0)
67 pub fn mark_known(attr: &Attribute) {
68 debug!("Marking {:?} as known.", attr);
69 let AttrId(id) = attr.id;
70 GLOBALS.with(|globals| {
71 let mut slot = globals.known_attrs.lock();
72 let idx = (id / 64) as usize;
74 if slot.len() <= idx {
75 slot.resize(idx + 1, 0);
77 slot[idx] |= 1 << shift;
81 pub fn is_known(attr: &Attribute) -> bool {
82 let AttrId(id) = attr.id;
83 GLOBALS.with(|globals| {
84 let slot = globals.known_attrs.lock();
85 let idx = (id / 64) as usize;
87 slot.get(idx).map(|bits| bits & (1 << shift) != 0)
92 const RUST_KNOWN_TOOL: &[&str] = &["clippy", "rustfmt"];
93 const RUST_KNOWN_LINT_TOOL: &[&str] = &["clippy"];
95 pub fn is_known_tool(attr: &Attribute) -> bool {
97 attr.path.segments.iter().next().expect("empty path in attribute").ident.name;
98 RUST_KNOWN_TOOL.contains(&tool_name.as_str().as_ref())
101 pub fn is_known_lint_tool(m_item: &MetaItem) -> bool {
103 m_item.ident.segments.iter().next().expect("empty path in meta item").ident.name;
104 RUST_KNOWN_LINT_TOOL.contains(&tool_name.as_str().as_ref())
107 impl NestedMetaItem {
108 /// Returns the MetaItem if self is a NestedMetaItemKind::MetaItem.
109 pub fn meta_item(&self) -> Option<&MetaItem> {
111 NestedMetaItemKind::MetaItem(ref item) => Some(item),
116 /// Returns the Lit if self is a NestedMetaItemKind::Literal.
117 pub fn literal(&self) -> Option<&Lit> {
119 NestedMetaItemKind::Literal(ref lit) => Some(lit),
124 /// Returns the Span for `self`.
125 pub fn span(&self) -> Span {
129 /// Returns true if this list item is a MetaItem with a name of `name`.
130 pub fn check_name(&self, name: &str) -> bool {
131 self.meta_item().map_or(false, |meta_item| meta_item.check_name(name))
134 /// Returns the name of the meta item, e.g. `foo` in `#[foo]`,
135 /// `#[foo="bar"]` and `#[foo(bar)]`, if self is a MetaItem
136 pub fn name(&self) -> Option<Name> {
137 self.meta_item().and_then(|meta_item| Some(meta_item.name()))
140 /// Gets the string value if self is a MetaItem and the MetaItem is a
141 /// MetaItemKind::NameValue variant containing a string, otherwise None.
142 pub fn value_str(&self) -> Option<Symbol> {
143 self.meta_item().and_then(|meta_item| meta_item.value_str())
146 /// Returns a name and single literal value tuple of the MetaItem.
147 pub fn name_value_literal(&self) -> Option<(Name, &Lit)> {
148 self.meta_item().and_then(
149 |meta_item| meta_item.meta_item_list().and_then(
151 if meta_item_list.len() == 1 {
152 let nested_item = &meta_item_list[0];
153 if nested_item.is_literal() {
154 Some((meta_item.name(), nested_item.literal().unwrap()))
164 /// Returns a MetaItem if self is a MetaItem with Kind Word.
165 pub fn word(&self) -> Option<&MetaItem> {
166 self.meta_item().and_then(|meta_item| if meta_item.is_word() {
173 /// Gets a list of inner meta items from a list MetaItem type.
174 pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]> {
175 self.meta_item().and_then(|meta_item| meta_item.meta_item_list())
178 /// Returns `true` if the variant is MetaItem.
179 pub fn is_meta_item(&self) -> bool {
180 self.meta_item().is_some()
183 /// Returns `true` if the variant is Literal.
184 pub fn is_literal(&self) -> bool {
185 self.literal().is_some()
188 /// Returns `true` if self is a MetaItem and the meta item is a word.
189 pub fn is_word(&self) -> bool {
190 self.word().is_some()
193 /// Returns `true` if self is a MetaItem and the meta item is a ValueString.
194 pub fn is_value_str(&self) -> bool {
195 self.value_str().is_some()
198 /// Returns `true` if self is a MetaItem and the meta item is a list.
199 pub fn is_meta_item_list(&self) -> bool {
200 self.meta_item_list().is_some()
204 fn name_from_path(path: &Path) -> Name {
205 path.segments.last().expect("empty path in attribute").ident.name
209 pub fn check_name(&self, name: &str) -> bool {
210 let matches = self.path == name;
217 /// Returns the **last** segment of the name of this attribute.
218 /// E.g. `foo` for `#[foo]`, `skip` for `#[rustfmt::skip]`.
219 pub fn name(&self) -> Name {
220 name_from_path(&self.path)
223 pub fn value_str(&self) -> Option<Symbol> {
224 self.meta().and_then(|meta| meta.value_str())
227 pub fn meta_item_list(&self) -> Option<Vec<NestedMetaItem>> {
229 Some(MetaItem { node: MetaItemKind::List(list), .. }) => Some(list),
234 pub fn is_word(&self) -> bool {
235 self.path.segments.len() == 1 && self.tokens.is_empty()
238 pub fn span(&self) -> Span {
242 pub fn is_meta_item_list(&self) -> bool {
243 self.meta_item_list().is_some()
246 /// Indicates if the attribute is a Value String.
247 pub fn is_value_str(&self) -> bool {
248 self.value_str().is_some()
251 pub fn is_scoped(&self) -> bool {
252 self.path.segments.len() > 1
257 pub fn name(&self) -> Name {
258 name_from_path(&self.ident)
261 pub fn value_str(&self) -> Option<Symbol> {
263 MetaItemKind::NameValue(ref v) => {
265 LitKind::Str(ref s, _) => Some(*s),
273 pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]> {
275 MetaItemKind::List(ref l) => Some(&l[..]),
280 pub fn is_word(&self) -> bool {
282 MetaItemKind::Word => true,
287 pub fn span(&self) -> Span { self.span }
289 pub fn check_name(&self, name: &str) -> bool {
293 pub fn is_value_str(&self) -> bool {
294 self.value_str().is_some()
297 pub fn is_meta_item_list(&self) -> bool {
298 self.meta_item_list().is_some()
301 pub fn is_scoped(&self) -> bool {
302 self.ident.segments.len() > 1
307 /// Extract the MetaItem from inside this Attribute.
308 pub fn meta(&self) -> Option<MetaItem> {
309 let mut tokens = self.tokens.trees().peekable();
311 ident: self.path.clone(),
312 node: if let Some(node) = MetaItemKind::from_tokens(&mut tokens) {
313 if tokens.peek().is_some() {
324 pub fn parse<'a, T, F>(&self, sess: &'a ParseSess, mut f: F) -> PResult<'a, T>
325 where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>,
327 let mut parser = Parser::new(sess, self.tokens.clone(), None, false, false);
328 let result = f(&mut parser)?;
329 if parser.token != token::Eof {
330 parser.unexpected()?;
335 pub fn parse_list<'a, T, F>(&self, sess: &'a ParseSess, mut f: F) -> PResult<'a, Vec<T>>
336 where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>,
338 if self.tokens.is_empty() {
339 return Ok(Vec::new());
341 self.parse(sess, |parser| {
342 parser.expect(&token::OpenDelim(token::Paren))?;
343 let mut list = Vec::new();
344 while !parser.eat(&token::CloseDelim(token::Paren)) {
345 list.push(f(parser)?);
346 if !parser.eat(&token::Comma) {
347 parser.expect(&token::CloseDelim(token::Paren))?;
355 pub fn parse_meta<'a>(&self, sess: &'a ParseSess) -> PResult<'a, MetaItem> {
357 ident: self.path.clone(),
358 node: self.parse(sess, |parser| parser.parse_meta_item_kind())?,
363 /// Convert self to a normal #[doc="foo"] comment, if it is a
364 /// comment like `///` or `/** */`. (Returns self unchanged for
365 /// non-sugared doc attributes.)
366 pub fn with_desugared_doc<T, F>(&self, f: F) -> T where
367 F: FnOnce(&Attribute) -> T,
369 if self.is_sugared_doc {
370 let comment = self.value_str().unwrap();
371 let meta = mk_name_value_item_str(
372 Ident::from_str("doc"),
373 dummy_spanned(Symbol::intern(&strip_doc_comment_decoration(&comment.as_str()))));
374 let mut attr = if self.style == ast::AttrStyle::Outer {
375 mk_attr_outer(self.span, self.id, meta)
377 mk_attr_inner(self.span, self.id, meta)
379 attr.is_sugared_doc = true;
389 pub fn mk_name_value_item_str(ident: Ident, value: Spanned<Symbol>) -> MetaItem {
390 let value = respan(value.span, LitKind::Str(value.node, ast::StrStyle::Cooked));
391 mk_name_value_item(ident.span.to(value.span), ident, value)
394 pub fn mk_name_value_item(span: Span, ident: Ident, value: ast::Lit) -> MetaItem {
395 MetaItem { ident: Path::from_ident(ident), span, node: MetaItemKind::NameValue(value) }
398 pub fn mk_list_item(span: Span, ident: Ident, items: Vec<NestedMetaItem>) -> MetaItem {
399 MetaItem { ident: Path::from_ident(ident), span, node: MetaItemKind::List(items) }
402 pub fn mk_word_item(ident: Ident) -> MetaItem {
403 MetaItem { ident: Path::from_ident(ident), span: ident.span, node: MetaItemKind::Word }
406 pub fn mk_nested_word_item(ident: Ident) -> NestedMetaItem {
407 respan(ident.span, NestedMetaItemKind::MetaItem(mk_word_item(ident)))
410 pub fn mk_attr_id() -> AttrId {
411 use std::sync::atomic::AtomicUsize;
412 use std::sync::atomic::Ordering;
414 static NEXT_ATTR_ID: AtomicUsize = AtomicUsize::new(0);
416 let id = NEXT_ATTR_ID.fetch_add(1, Ordering::SeqCst);
417 assert!(id != ::std::usize::MAX);
421 /// Returns an inner attribute with the given value.
422 pub fn mk_attr_inner(span: Span, id: AttrId, item: MetaItem) -> Attribute {
423 mk_spanned_attr_inner(span, id, item)
426 /// Returns an inner attribute with the given value and span.
427 pub fn mk_spanned_attr_inner(sp: Span, id: AttrId, item: MetaItem) -> Attribute {
430 style: ast::AttrStyle::Inner,
432 tokens: item.node.tokens(item.span),
433 is_sugared_doc: false,
438 /// Returns an outer attribute with the given value.
439 pub fn mk_attr_outer(span: Span, id: AttrId, item: MetaItem) -> Attribute {
440 mk_spanned_attr_outer(span, id, item)
443 /// Returns an outer attribute with the given value and span.
444 pub fn mk_spanned_attr_outer(sp: Span, id: AttrId, item: MetaItem) -> Attribute {
447 style: ast::AttrStyle::Outer,
449 tokens: item.node.tokens(item.span),
450 is_sugared_doc: false,
455 pub fn mk_sugared_doc_attr(id: AttrId, text: Symbol, span: Span) -> Attribute {
456 let style = doc_comment_style(&text.as_str());
457 let lit = respan(span, LitKind::Str(text, ast::StrStyle::Cooked));
461 path: Path::from_ident(Ident::from_str("doc").with_span_pos(span)),
462 tokens: MetaItemKind::NameValue(lit).tokens(span),
463 is_sugared_doc: true,
468 pub fn list_contains_name(items: &[NestedMetaItem], name: &str) -> bool {
469 items.iter().any(|item| {
470 item.check_name(name)
474 pub fn contains_name(attrs: &[Attribute], name: &str) -> bool {
475 attrs.iter().any(|item| {
476 item.check_name(name)
480 pub fn find_by_name<'a>(attrs: &'a [Attribute], name: &str) -> Option<&'a Attribute> {
481 attrs.iter().find(|attr| attr.check_name(name))
484 pub fn first_attr_value_str_by_name(attrs: &[Attribute], name: &str) -> Option<Symbol> {
486 .find(|at| at.check_name(name))
487 .and_then(|at| at.value_str())
491 fn tokens(&self) -> TokenStream {
492 let mut idents = vec![];
493 let mut last_pos = BytePos(0 as u32);
494 for (i, segment) in self.ident.segments.iter().enumerate() {
495 let is_first = i == 0;
497 let mod_sep_span = Span::new(last_pos,
498 segment.ident.span.lo(),
499 segment.ident.span.ctxt());
500 idents.push(TokenTree::Token(mod_sep_span, Token::ModSep).into());
502 idents.push(TokenTree::Token(segment.ident.span,
503 Token::from_ast_ident(segment.ident)).into());
504 last_pos = segment.ident.span.hi();
506 idents.push(self.node.tokens(self.span));
507 TokenStream::concat(idents)
510 fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItem>
511 where I: Iterator<Item = TokenTree>,
513 // FIXME: Share code with `parse_path`.
514 let ident = match tokens.next() {
515 Some(TokenTree::Token(span, Token::Ident(ident, _))) => {
516 if let Some(TokenTree::Token(_, Token::ModSep)) = tokens.peek() {
517 let mut segments = vec![PathSegment::from_ident(ident.with_span_pos(span))];
520 if let Some(TokenTree::Token(span,
521 Token::Ident(ident, _))) = tokens.next() {
522 segments.push(PathSegment::from_ident(ident.with_span_pos(span)));
526 if let Some(TokenTree::Token(_, Token::ModSep)) = tokens.peek() {
532 let span = span.with_hi(segments.last().unwrap().ident.span.hi());
533 Path { span, segments }
535 Path::from_ident(ident.with_span_pos(span))
538 Some(TokenTree::Token(_, Token::Interpolated(ref nt))) => match nt.0 {
539 token::Nonterminal::NtIdent(ident, _) => Path::from_ident(ident),
540 token::Nonterminal::NtMeta(ref meta) => return Some(meta.clone()),
541 token::Nonterminal::NtPath(ref path) => path.clone(),
546 let list_closing_paren_pos = tokens.peek().map(|tt| tt.span().hi());
547 let node = MetaItemKind::from_tokens(tokens)?;
548 let hi = match node {
549 MetaItemKind::NameValue(ref lit) => lit.span.hi(),
550 MetaItemKind::List(..) => list_closing_paren_pos.unwrap_or(ident.span.hi()),
551 _ => ident.span.hi(),
553 let span = ident.span.with_hi(hi);
554 Some(MetaItem { ident, node, span })
559 pub fn tokens(&self, span: Span) -> TokenStream {
561 MetaItemKind::Word => TokenStream::empty(),
562 MetaItemKind::NameValue(ref lit) => {
563 TokenStream::concat(vec![TokenTree::Token(span, Token::Eq).into(), lit.tokens()])
565 MetaItemKind::List(ref list) => {
566 let mut tokens = Vec::new();
567 for (i, item) in list.iter().enumerate() {
569 tokens.push(TokenTree::Token(span, Token::Comma).into());
571 tokens.push(item.node.tokens());
573 TokenTree::Delimited(span, Delimited {
575 tts: TokenStream::concat(tokens).into(),
581 fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItemKind>
582 where I: Iterator<Item = TokenTree>,
584 let delimited = match tokens.peek().cloned() {
585 Some(TokenTree::Token(_, token::Eq)) => {
587 return if let Some(TokenTree::Token(span, token)) = tokens.next() {
588 LitKind::from_token(token)
589 .map(|lit| MetaItemKind::NameValue(Spanned { node: lit, span: span }))
594 Some(TokenTree::Delimited(_, ref delimited)) if delimited.delim == token::Paren => {
598 _ => return Some(MetaItemKind::Word),
601 let mut tokens = delimited.into_trees().peekable();
602 let mut result = Vec::new();
603 while let Some(..) = tokens.peek() {
604 let item = NestedMetaItemKind::from_tokens(&mut tokens)?;
605 result.push(respan(item.span(), item));
606 match tokens.next() {
607 None | Some(TokenTree::Token(_, Token::Comma)) => {}
611 Some(MetaItemKind::List(result))
615 impl NestedMetaItemKind {
616 fn span(&self) -> Span {
618 NestedMetaItemKind::MetaItem(ref item) => item.span,
619 NestedMetaItemKind::Literal(ref lit) => lit.span,
623 fn tokens(&self) -> TokenStream {
625 NestedMetaItemKind::MetaItem(ref item) => item.tokens(),
626 NestedMetaItemKind::Literal(ref lit) => lit.tokens(),
630 fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<NestedMetaItemKind>
631 where I: Iterator<Item = TokenTree>,
633 if let Some(TokenTree::Token(span, token)) = tokens.peek().cloned() {
634 if let Some(node) = LitKind::from_token(token) {
636 return Some(NestedMetaItemKind::Literal(respan(span, node)));
640 MetaItem::from_tokens(tokens).map(NestedMetaItemKind::MetaItem)
645 fn tokens(&self) -> TokenStream {
646 TokenTree::Token(self.span, self.node.token()).into()
651 fn token(&self) -> Token {
655 LitKind::Str(string, ast::StrStyle::Cooked) => {
656 let escaped = string.as_str().escape_default();
657 Token::Literal(token::Lit::Str_(Symbol::intern(&escaped)), None)
659 LitKind::Str(string, ast::StrStyle::Raw(n)) => {
660 Token::Literal(token::Lit::StrRaw(string, n), None)
662 LitKind::ByteStr(ref bytes) => {
663 let string = bytes.iter().cloned().flat_map(ascii::escape_default)
664 .map(Into::<char>::into).collect::<String>();
665 Token::Literal(token::Lit::ByteStr(Symbol::intern(&string)), None)
667 LitKind::Byte(byte) => {
668 let string: String = ascii::escape_default(byte).map(Into::<char>::into).collect();
669 Token::Literal(token::Lit::Byte(Symbol::intern(&string)), None)
671 LitKind::Char(ch) => {
672 let string: String = ch.escape_default().map(Into::<char>::into).collect();
673 Token::Literal(token::Lit::Char(Symbol::intern(&string)), None)
675 LitKind::Int(n, ty) => {
676 let suffix = match ty {
677 ast::LitIntType::Unsigned(ty) => Some(Symbol::intern(ty.ty_to_string())),
678 ast::LitIntType::Signed(ty) => Some(Symbol::intern(ty.ty_to_string())),
679 ast::LitIntType::Unsuffixed => None,
681 Token::Literal(token::Lit::Integer(Symbol::intern(&n.to_string())), suffix)
683 LitKind::Float(symbol, ty) => {
684 Token::Literal(token::Lit::Float(symbol), Some(Symbol::intern(ty.ty_to_string())))
686 LitKind::FloatUnsuffixed(symbol) => Token::Literal(token::Lit::Float(symbol), None),
687 LitKind::Bool(value) => Token::Ident(Ident::with_empty_ctxt(Symbol::intern(if value {
695 fn from_token(token: Token) -> Option<LitKind> {
697 Token::Ident(ident, false) if ident.name == "true" => Some(LitKind::Bool(true)),
698 Token::Ident(ident, false) if ident.name == "false" => Some(LitKind::Bool(false)),
699 Token::Interpolated(ref nt) => match nt.0 {
700 token::NtExpr(ref v) | token::NtLiteral(ref v) => match v.node {
701 ExprKind::Lit(ref lit) => Some(lit.node.clone()),
706 Token::Literal(lit, suf) => {
707 let (suffix_illegal, result) = parse::lit_token(lit, suf, None);
708 if suffix_illegal && suf.is_some() {
718 pub trait HasAttrs: Sized {
719 fn attrs(&self) -> &[ast::Attribute];
720 fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self;
723 impl<T: HasAttrs> HasAttrs for Spanned<T> {
724 fn attrs(&self) -> &[ast::Attribute] { self.node.attrs() }
725 fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self {
726 respan(self.span, self.node.map_attrs(f))
730 impl HasAttrs for Vec<Attribute> {
731 fn attrs(&self) -> &[Attribute] {
734 fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self {
739 impl HasAttrs for ThinVec<Attribute> {
740 fn attrs(&self) -> &[Attribute] {
743 fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self {
744 f(self.into()).into()
748 impl<T: HasAttrs + 'static> HasAttrs for P<T> {
749 fn attrs(&self) -> &[Attribute] {
752 fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self {
753 self.map(|t| t.map_attrs(f))
757 impl HasAttrs for StmtKind {
758 fn attrs(&self) -> &[Attribute] {
760 StmtKind::Local(ref local) => local.attrs(),
761 StmtKind::Item(..) => &[],
762 StmtKind::Expr(ref expr) | StmtKind::Semi(ref expr) => expr.attrs(),
763 StmtKind::Mac(ref mac) => {
764 let (_, _, ref attrs) = **mac;
770 fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self {
772 StmtKind::Local(local) => StmtKind::Local(local.map_attrs(f)),
773 StmtKind::Item(..) => self,
774 StmtKind::Expr(expr) => StmtKind::Expr(expr.map_attrs(f)),
775 StmtKind::Semi(expr) => StmtKind::Semi(expr.map_attrs(f)),
776 StmtKind::Mac(mac) => StmtKind::Mac(mac.map(|(mac, style, attrs)| {
777 (mac, style, attrs.map_attrs(f))
783 impl HasAttrs for Stmt {
784 fn attrs(&self) -> &[ast::Attribute] { self.node.attrs() }
785 fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self {
786 Stmt { id: self.id, node: self.node.map_attrs(f), span: self.span }
790 impl HasAttrs for GenericParam {
791 fn attrs(&self) -> &[ast::Attribute] {
795 fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(mut self, f: F) -> Self {
796 self.attrs = self.attrs.map_attrs(f);
801 macro_rules! derive_has_attrs {
802 ($($ty:path),*) => { $(
803 impl HasAttrs for $ty {
804 fn attrs(&self) -> &[Attribute] {
808 fn map_attrs<F>(mut self, f: F) -> Self
809 where F: FnOnce(Vec<Attribute>) -> Vec<Attribute>,
811 self.attrs = self.attrs.map_attrs(f);
819 Item, Expr, Local, ast::ForeignItem, ast::StructField, ast::ImplItem, ast::TraitItem, ast::Arm,
820 ast::Field, ast::FieldPat, ast::Variant_