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, AttrStyle, 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};
29 use syntax_pos::{FileName, Span};
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};
37 use tokenstream::{TokenStream, TokenTree, Delimited};
42 pub fn mark_used(attr: &Attribute) {
43 debug!("Marking {:?} as used.", attr);
44 GLOBALS.with(|globals| {
45 globals.used_attrs.lock().insert(attr.id);
49 pub fn is_used(attr: &Attribute) -> bool {
50 GLOBALS.with(|globals| {
51 globals.used_attrs.lock().contains(attr.id)
55 pub fn mark_known(attr: &Attribute) {
56 debug!("Marking {:?} as known.", attr);
57 GLOBALS.with(|globals| {
58 globals.known_attrs.lock().insert(attr.id);
62 pub fn is_known(attr: &Attribute) -> bool {
63 GLOBALS.with(|globals| {
64 globals.known_attrs.lock().contains(attr.id)
68 pub fn is_known_lint_tool(m_item: Ident) -> bool {
69 ["clippy"].contains(&m_item.as_str().as_ref())
73 /// Returns the MetaItem if self is a NestedMetaItemKind::MetaItem.
74 pub fn meta_item(&self) -> Option<&MetaItem> {
76 NestedMetaItemKind::MetaItem(ref item) => Some(item),
81 /// Returns the Lit if self is a NestedMetaItemKind::Literal.
82 pub fn literal(&self) -> Option<&Lit> {
84 NestedMetaItemKind::Literal(ref lit) => Some(lit),
89 /// Returns the Span for `self`.
90 pub fn span(&self) -> Span {
94 /// Returns true if this list item is a MetaItem with a name of `name`.
95 pub fn check_name(&self, name: &str) -> bool {
96 self.meta_item().map_or(false, |meta_item| meta_item.check_name(name))
99 /// Returns the name of the meta item, e.g. `foo` in `#[foo]`,
100 /// `#[foo="bar"]` and `#[foo(bar)]`, if self is a MetaItem
101 pub fn name(&self) -> Option<Name> {
102 self.meta_item().and_then(|meta_item| Some(meta_item.name()))
105 /// Gets the string value if self is a MetaItem and the MetaItem is a
106 /// MetaItemKind::NameValue variant containing a string, otherwise None.
107 pub fn value_str(&self) -> Option<Symbol> {
108 self.meta_item().and_then(|meta_item| meta_item.value_str())
111 /// Returns a name and single literal value tuple of the MetaItem.
112 pub fn name_value_literal(&self) -> Option<(Name, &Lit)> {
113 self.meta_item().and_then(
114 |meta_item| meta_item.meta_item_list().and_then(
116 if meta_item_list.len() == 1 {
117 let nested_item = &meta_item_list[0];
118 if nested_item.is_literal() {
119 Some((meta_item.name(), nested_item.literal().unwrap()))
129 /// Returns a MetaItem if self is a MetaItem with Kind Word.
130 pub fn word(&self) -> Option<&MetaItem> {
131 self.meta_item().and_then(|meta_item| if meta_item.is_word() {
138 /// Gets a list of inner meta items from a list MetaItem type.
139 pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]> {
140 self.meta_item().and_then(|meta_item| meta_item.meta_item_list())
143 /// Returns `true` if the variant is MetaItem.
144 pub fn is_meta_item(&self) -> bool {
145 self.meta_item().is_some()
148 /// Returns `true` if the variant is Literal.
149 pub fn is_literal(&self) -> bool {
150 self.literal().is_some()
153 /// Returns `true` if self is a MetaItem and the meta item is a word.
154 pub fn is_word(&self) -> bool {
155 self.word().is_some()
158 /// Returns `true` if self is a MetaItem and the meta item is a ValueString.
159 pub fn is_value_str(&self) -> bool {
160 self.value_str().is_some()
163 /// Returns `true` if self is a MetaItem and the meta item is a list.
164 pub fn is_meta_item_list(&self) -> bool {
165 self.meta_item_list().is_some()
169 fn name_from_path(path: &Path) -> Name {
170 path.segments.last().expect("empty path in attribute").ident.name
174 pub fn check_name(&self, name: &str) -> bool {
175 let matches = self.path == name;
182 /// Returns the **last** segment of the name of this attribute.
183 /// E.g. `foo` for `#[foo]`, `skip` for `#[rustfmt::skip]`.
184 pub fn name(&self) -> Name {
185 name_from_path(&self.path)
188 pub fn value_str(&self) -> Option<Symbol> {
189 self.meta().and_then(|meta| meta.value_str())
192 pub fn meta_item_list(&self) -> Option<Vec<NestedMetaItem>> {
194 Some(MetaItem { node: MetaItemKind::List(list), .. }) => Some(list),
199 pub fn is_word(&self) -> bool {
200 self.path.segments.len() == 1 && self.tokens.is_empty()
203 pub fn span(&self) -> Span {
207 pub fn is_meta_item_list(&self) -> bool {
208 self.meta_item_list().is_some()
211 /// Indicates if the attribute is a Value String.
212 pub fn is_value_str(&self) -> bool {
213 self.value_str().is_some()
218 pub fn name(&self) -> Name {
219 name_from_path(&self.ident)
222 pub fn value_str(&self) -> Option<Symbol> {
224 MetaItemKind::NameValue(ref v) => {
226 LitKind::Str(ref s, _) => Some(*s),
234 pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]> {
236 MetaItemKind::List(ref l) => Some(&l[..]),
241 pub fn is_word(&self) -> bool {
243 MetaItemKind::Word => true,
248 pub fn span(&self) -> Span { self.span }
250 pub fn check_name(&self, name: &str) -> bool {
254 pub fn is_value_str(&self) -> bool {
255 self.value_str().is_some()
258 pub fn is_meta_item_list(&self) -> bool {
259 self.meta_item_list().is_some()
262 pub fn is_scoped(&self) -> Option<Ident> {
263 if self.ident.segments.len() > 1 {
264 Some(self.ident.segments[0].ident)
272 /// Extract the MetaItem from inside this Attribute.
273 pub fn meta(&self) -> Option<MetaItem> {
274 let mut tokens = self.tokens.trees().peekable();
276 ident: self.path.clone(),
277 node: if let Some(node) = MetaItemKind::from_tokens(&mut tokens) {
278 if tokens.peek().is_some() {
289 pub fn parse<'a, T, F>(&self, sess: &'a ParseSess, mut f: F) -> PResult<'a, T>
290 where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>,
292 let mut parser = Parser::new(sess, self.tokens.clone(), None, false, false);
293 let result = f(&mut parser)?;
294 if parser.token != token::Eof {
295 parser.unexpected()?;
300 pub fn parse_list<'a, T, F>(&self, sess: &'a ParseSess, mut f: F) -> PResult<'a, Vec<T>>
301 where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>,
303 if self.tokens.is_empty() {
304 return Ok(Vec::new());
306 self.parse(sess, |parser| {
307 parser.expect(&token::OpenDelim(token::Paren))?;
308 let mut list = Vec::new();
309 while !parser.eat(&token::CloseDelim(token::Paren)) {
310 list.push(f(parser)?);
311 if !parser.eat(&token::Comma) {
312 parser.expect(&token::CloseDelim(token::Paren))?;
320 pub fn parse_meta<'a>(&self, sess: &'a ParseSess) -> PResult<'a, MetaItem> {
322 ident: self.path.clone(),
323 node: self.parse(sess, |parser| parser.parse_meta_item_kind())?,
328 /// Convert self to a normal #[doc="foo"] comment, if it is a
329 /// comment like `///` or `/** */`. (Returns self unchanged for
330 /// non-sugared doc attributes.)
331 pub fn with_desugared_doc<T, F>(&self, f: F) -> T where
332 F: FnOnce(&Attribute) -> T,
334 if self.is_sugared_doc {
335 let comment = self.value_str().unwrap();
336 let meta = mk_name_value_item_str(
337 Ident::from_str("doc"),
338 dummy_spanned(Symbol::intern(&strip_doc_comment_decoration(&comment.as_str()))));
339 let mut attr = if self.style == ast::AttrStyle::Outer {
340 mk_attr_outer(self.span, self.id, meta)
342 mk_attr_inner(self.span, self.id, meta)
344 attr.is_sugared_doc = true;
354 pub fn mk_name_value_item_str(ident: Ident, value: Spanned<Symbol>) -> MetaItem {
355 let value = respan(value.span, LitKind::Str(value.node, ast::StrStyle::Cooked));
356 mk_name_value_item(ident.span.to(value.span), ident, value)
359 pub fn mk_name_value_item(span: Span, ident: Ident, value: ast::Lit) -> MetaItem {
360 MetaItem { ident: Path::from_ident(ident), span, node: MetaItemKind::NameValue(value) }
363 pub fn mk_list_item(span: Span, ident: Ident, items: Vec<NestedMetaItem>) -> MetaItem {
364 MetaItem { ident: Path::from_ident(ident), span, node: MetaItemKind::List(items) }
367 pub fn mk_word_item(ident: Ident) -> MetaItem {
368 MetaItem { ident: Path::from_ident(ident), span: ident.span, node: MetaItemKind::Word }
371 pub fn mk_nested_word_item(ident: Ident) -> NestedMetaItem {
372 respan(ident.span, NestedMetaItemKind::MetaItem(mk_word_item(ident)))
375 pub fn mk_attr_id() -> AttrId {
376 use std::sync::atomic::AtomicUsize;
377 use std::sync::atomic::Ordering;
379 static NEXT_ATTR_ID: AtomicUsize = AtomicUsize::new(0);
381 let id = NEXT_ATTR_ID.fetch_add(1, Ordering::SeqCst);
382 assert!(id != ::std::usize::MAX);
386 /// Returns an inner attribute with the given value.
387 pub fn mk_attr_inner(span: Span, id: AttrId, item: MetaItem) -> Attribute {
388 mk_spanned_attr_inner(span, id, item)
391 /// Returns an inner attribute with the given value and span.
392 pub fn mk_spanned_attr_inner(sp: Span, id: AttrId, item: MetaItem) -> Attribute {
395 style: ast::AttrStyle::Inner,
397 tokens: item.node.tokens(item.span),
398 is_sugared_doc: false,
403 /// Returns an outer attribute with the given value.
404 pub fn mk_attr_outer(span: Span, id: AttrId, item: MetaItem) -> Attribute {
405 mk_spanned_attr_outer(span, id, item)
408 /// Returns an outer attribute with the given value and span.
409 pub fn mk_spanned_attr_outer(sp: Span, id: AttrId, item: MetaItem) -> Attribute {
412 style: ast::AttrStyle::Outer,
414 tokens: item.node.tokens(item.span),
415 is_sugared_doc: false,
420 pub fn mk_sugared_doc_attr(id: AttrId, text: Symbol, span: Span) -> Attribute {
421 let style = doc_comment_style(&text.as_str());
422 let lit = respan(span, LitKind::Str(text, ast::StrStyle::Cooked));
426 path: Path::from_ident(Ident::from_str("doc").with_span_pos(span)),
427 tokens: MetaItemKind::NameValue(lit).tokens(span),
428 is_sugared_doc: true,
433 pub fn list_contains_name(items: &[NestedMetaItem], name: &str) -> bool {
434 items.iter().any(|item| {
435 item.check_name(name)
439 pub fn contains_name(attrs: &[Attribute], name: &str) -> bool {
440 attrs.iter().any(|item| {
441 item.check_name(name)
445 pub fn find_by_name<'a>(attrs: &'a [Attribute], name: &str) -> Option<&'a Attribute> {
446 attrs.iter().find(|attr| attr.check_name(name))
449 pub fn first_attr_value_str_by_name(attrs: &[Attribute], name: &str) -> Option<Symbol> {
451 .find(|at| at.check_name(name))
452 .and_then(|at| at.value_str())
456 fn tokens(&self) -> TokenStream {
457 let mut idents = vec![];
458 let mut last_pos = BytePos(0 as u32);
459 for (i, segment) in self.ident.segments.iter().enumerate() {
460 let is_first = i == 0;
462 let mod_sep_span = Span::new(last_pos,
463 segment.ident.span.lo(),
464 segment.ident.span.ctxt());
465 idents.push(TokenTree::Token(mod_sep_span, Token::ModSep).into());
467 idents.push(TokenTree::Token(segment.ident.span,
468 Token::from_ast_ident(segment.ident)).into());
469 last_pos = segment.ident.span.hi();
471 idents.push(self.node.tokens(self.span));
472 TokenStream::concat(idents)
475 fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItem>
476 where I: Iterator<Item = TokenTree>,
478 // FIXME: Share code with `parse_path`.
479 let ident = match tokens.next() {
480 Some(TokenTree::Token(span, Token::Ident(ident, _))) => {
481 if let Some(TokenTree::Token(_, Token::ModSep)) = tokens.peek() {
482 let mut segments = vec![PathSegment::from_ident(ident.with_span_pos(span))];
485 if let Some(TokenTree::Token(span,
486 Token::Ident(ident, _))) = tokens.next() {
487 segments.push(PathSegment::from_ident(ident.with_span_pos(span)));
491 if let Some(TokenTree::Token(_, Token::ModSep)) = tokens.peek() {
497 let span = span.with_hi(segments.last().unwrap().ident.span.hi());
498 Path { span, segments }
500 Path::from_ident(ident.with_span_pos(span))
503 Some(TokenTree::Token(_, Token::Interpolated(ref nt))) => match nt.0 {
504 token::Nonterminal::NtIdent(ident, _) => Path::from_ident(ident),
505 token::Nonterminal::NtMeta(ref meta) => return Some(meta.clone()),
506 token::Nonterminal::NtPath(ref path) => path.clone(),
511 let list_closing_paren_pos = tokens.peek().map(|tt| tt.span().hi());
512 let node = MetaItemKind::from_tokens(tokens)?;
513 let hi = match node {
514 MetaItemKind::NameValue(ref lit) => lit.span.hi(),
515 MetaItemKind::List(..) => list_closing_paren_pos.unwrap_or(ident.span.hi()),
516 _ => ident.span.hi(),
518 let span = ident.span.with_hi(hi);
519 Some(MetaItem { ident, node, span })
524 pub fn tokens(&self, span: Span) -> TokenStream {
526 MetaItemKind::Word => TokenStream::empty(),
527 MetaItemKind::NameValue(ref lit) => {
528 TokenStream::concat(vec![TokenTree::Token(span, Token::Eq).into(), lit.tokens()])
530 MetaItemKind::List(ref list) => {
531 let mut tokens = Vec::new();
532 for (i, item) in list.iter().enumerate() {
534 tokens.push(TokenTree::Token(span, Token::Comma).into());
536 tokens.push(item.node.tokens());
538 TokenTree::Delimited(span, Delimited {
540 tts: TokenStream::concat(tokens).into(),
546 fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItemKind>
547 where I: Iterator<Item = TokenTree>,
549 let delimited = match tokens.peek().cloned() {
550 Some(TokenTree::Token(_, token::Eq)) => {
552 return if let Some(TokenTree::Token(span, token)) = tokens.next() {
553 LitKind::from_token(token)
554 .map(|lit| MetaItemKind::NameValue(Spanned { node: lit, span: span }))
559 Some(TokenTree::Delimited(_, ref delimited)) if delimited.delim == token::Paren => {
563 _ => return Some(MetaItemKind::Word),
566 let mut tokens = delimited.into_trees().peekable();
567 let mut result = Vec::new();
568 while let Some(..) = tokens.peek() {
569 let item = NestedMetaItemKind::from_tokens(&mut tokens)?;
570 result.push(respan(item.span(), item));
571 match tokens.next() {
572 None | Some(TokenTree::Token(_, Token::Comma)) => {}
576 Some(MetaItemKind::List(result))
580 impl NestedMetaItemKind {
581 fn span(&self) -> Span {
583 NestedMetaItemKind::MetaItem(ref item) => item.span,
584 NestedMetaItemKind::Literal(ref lit) => lit.span,
588 fn tokens(&self) -> TokenStream {
590 NestedMetaItemKind::MetaItem(ref item) => item.tokens(),
591 NestedMetaItemKind::Literal(ref lit) => lit.tokens(),
595 fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<NestedMetaItemKind>
596 where I: Iterator<Item = TokenTree>,
598 if let Some(TokenTree::Token(span, token)) = tokens.peek().cloned() {
599 if let Some(node) = LitKind::from_token(token) {
601 return Some(NestedMetaItemKind::Literal(respan(span, node)));
605 MetaItem::from_tokens(tokens).map(NestedMetaItemKind::MetaItem)
610 fn tokens(&self) -> TokenStream {
611 TokenTree::Token(self.span, self.node.token()).into()
616 fn token(&self) -> Token {
620 LitKind::Str(string, ast::StrStyle::Cooked) => {
621 let escaped = string.as_str().escape_default();
622 Token::Literal(token::Lit::Str_(Symbol::intern(&escaped)), None)
624 LitKind::Str(string, ast::StrStyle::Raw(n)) => {
625 Token::Literal(token::Lit::StrRaw(string, n), None)
627 LitKind::ByteStr(ref bytes) => {
628 let string = bytes.iter().cloned().flat_map(ascii::escape_default)
629 .map(Into::<char>::into).collect::<String>();
630 Token::Literal(token::Lit::ByteStr(Symbol::intern(&string)), None)
632 LitKind::Byte(byte) => {
633 let string: String = ascii::escape_default(byte).map(Into::<char>::into).collect();
634 Token::Literal(token::Lit::Byte(Symbol::intern(&string)), None)
636 LitKind::Char(ch) => {
637 let string: String = ch.escape_default().map(Into::<char>::into).collect();
638 Token::Literal(token::Lit::Char(Symbol::intern(&string)), None)
640 LitKind::Int(n, ty) => {
641 let suffix = match ty {
642 ast::LitIntType::Unsigned(ty) => Some(Symbol::intern(ty.ty_to_string())),
643 ast::LitIntType::Signed(ty) => Some(Symbol::intern(ty.ty_to_string())),
644 ast::LitIntType::Unsuffixed => None,
646 Token::Literal(token::Lit::Integer(Symbol::intern(&n.to_string())), suffix)
648 LitKind::Float(symbol, ty) => {
649 Token::Literal(token::Lit::Float(symbol), Some(Symbol::intern(ty.ty_to_string())))
651 LitKind::FloatUnsuffixed(symbol) => Token::Literal(token::Lit::Float(symbol), None),
652 LitKind::Bool(value) => Token::Ident(Ident::with_empty_ctxt(Symbol::intern(if value {
660 fn from_token(token: Token) -> Option<LitKind> {
662 Token::Ident(ident, false) if ident.name == "true" => Some(LitKind::Bool(true)),
663 Token::Ident(ident, false) if ident.name == "false" => Some(LitKind::Bool(false)),
664 Token::Interpolated(ref nt) => match nt.0 {
665 token::NtExpr(ref v) | token::NtLiteral(ref v) => match v.node {
666 ExprKind::Lit(ref lit) => Some(lit.node.clone()),
671 Token::Literal(lit, suf) => {
672 let (suffix_illegal, result) = parse::lit_token(lit, suf, None);
673 if suffix_illegal && suf.is_some() {
683 pub trait HasAttrs: Sized {
684 fn attrs(&self) -> &[ast::Attribute];
685 fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self;
688 impl<T: HasAttrs> HasAttrs for Spanned<T> {
689 fn attrs(&self) -> &[ast::Attribute] { self.node.attrs() }
690 fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self {
691 respan(self.span, self.node.map_attrs(f))
695 impl HasAttrs for Vec<Attribute> {
696 fn attrs(&self) -> &[Attribute] {
699 fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self {
704 impl HasAttrs for ThinVec<Attribute> {
705 fn attrs(&self) -> &[Attribute] {
708 fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self {
709 f(self.into()).into()
713 impl<T: HasAttrs + 'static> HasAttrs for P<T> {
714 fn attrs(&self) -> &[Attribute] {
717 fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self {
718 self.map(|t| t.map_attrs(f))
722 impl HasAttrs for StmtKind {
723 fn attrs(&self) -> &[Attribute] {
725 StmtKind::Local(ref local) => local.attrs(),
726 StmtKind::Item(..) => &[],
727 StmtKind::Expr(ref expr) | StmtKind::Semi(ref expr) => expr.attrs(),
728 StmtKind::Mac(ref mac) => {
729 let (_, _, ref attrs) = **mac;
735 fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(self, f: F) -> Self {
737 StmtKind::Local(local) => StmtKind::Local(local.map_attrs(f)),
738 StmtKind::Item(..) => self,
739 StmtKind::Expr(expr) => StmtKind::Expr(expr.map_attrs(f)),
740 StmtKind::Semi(expr) => StmtKind::Semi(expr.map_attrs(f)),
741 StmtKind::Mac(mac) => StmtKind::Mac(mac.map(|(mac, style, attrs)| {
742 (mac, style, attrs.map_attrs(f))
748 impl HasAttrs for Stmt {
749 fn attrs(&self) -> &[ast::Attribute] { self.node.attrs() }
750 fn map_attrs<F: FnOnce(Vec<ast::Attribute>) -> Vec<ast::Attribute>>(self, f: F) -> Self {
751 Stmt { id: self.id, node: self.node.map_attrs(f), span: self.span }
755 impl HasAttrs for GenericParam {
756 fn attrs(&self) -> &[ast::Attribute] {
760 fn map_attrs<F: FnOnce(Vec<Attribute>) -> Vec<Attribute>>(mut self, f: F) -> Self {
761 self.attrs = self.attrs.map_attrs(f);
766 macro_rules! derive_has_attrs {
767 ($($ty:path),*) => { $(
768 impl HasAttrs for $ty {
769 fn attrs(&self) -> &[Attribute] {
773 fn map_attrs<F>(mut self, f: F) -> Self
774 where F: FnOnce(Vec<Attribute>) -> Vec<Attribute>,
776 self.attrs = self.attrs.map_attrs(f);
784 Item, Expr, Local, ast::ForeignItem, ast::StructField, ast::ImplItem, ast::TraitItem, ast::Arm,
785 ast::Field, ast::FieldPat, ast::Variant_
788 pub fn inject(mut krate: ast::Crate, parse_sess: &ParseSess, attrs: &[String]) -> ast::Crate {
789 for raw_attr in attrs {
790 let mut parser = parse::new_parser_from_source_str(
792 FileName::CliCrateAttr,
796 let start_span = parser.span;
797 let (path, tokens) = panictry!(parser.parse_path_and_tokens());
798 let end_span = parser.span;
799 if parser.token != token::Eof {
800 parse_sess.span_diagnostic
801 .span_err(start_span.to(end_span), "invalid crate attribute");
805 krate.attrs.push(Attribute {
807 style: AttrStyle::Inner,
810 is_sugared_doc: false,
811 span: start_span.to(end_span),