1 //! Functions dealing with attributes and meta items
6 cfg_matches, contains_feature_attr, eval_condition, find_crate_name, find_deprecation,
7 find_repr_attrs, find_stability, find_unwind_attr, Deprecation, InlineAttr, OptimizeAttr,
8 IntType, ReprAttr, RustcDeprecation, Stability, StabilityLevel, UnwindAttr,
12 pub use StabilityLevel::*;
15 use crate::ast::{AttrId, Attribute, AttrStyle, Name, Ident, Path, PathSegment};
16 use crate::ast::{MetaItem, MetaItemKind, NestedMetaItem};
17 use crate::ast::{Lit, LitKind, Expr, ExprKind, Item, Local, Stmt, StmtKind, GenericParam};
18 use crate::mut_visit::visit_clobber;
19 use crate::source_map::{BytePos, Spanned, respan, dummy_spanned};
20 use crate::parse::lexer::comments::{doc_comment_style, strip_doc_comment_decoration};
21 use crate::parse::parser::Parser;
22 use crate::parse::{self, ParseSess, PResult};
23 use crate::parse::token::{self, Token};
25 use crate::symbol::Symbol;
27 use crate::tokenstream::{TokenStream, TokenTree, DelimSpan};
31 use syntax_pos::{FileName, Span};
34 use std::ops::DerefMut;
36 pub fn mark_used(attr: &Attribute) {
37 debug!("Marking {:?} as used.", attr);
38 GLOBALS.with(|globals| {
39 globals.used_attrs.lock().insert(attr.id);
43 pub fn is_used(attr: &Attribute) -> bool {
44 GLOBALS.with(|globals| {
45 globals.used_attrs.lock().contains(attr.id)
49 pub fn mark_known(attr: &Attribute) {
50 debug!("Marking {:?} as known.", attr);
51 GLOBALS.with(|globals| {
52 globals.known_attrs.lock().insert(attr.id);
56 pub fn is_known(attr: &Attribute) -> bool {
57 GLOBALS.with(|globals| {
58 globals.known_attrs.lock().contains(attr.id)
62 pub fn is_known_lint_tool(m_item: Ident) -> bool {
63 ["clippy"].contains(&m_item.as_str().as_ref())
67 /// Returns the MetaItem if self is a NestedMetaItem::MetaItem.
68 pub fn meta_item(&self) -> Option<&MetaItem> {
70 NestedMetaItem::MetaItem(ref item) => Some(item),
75 /// Returns the Lit if self is a NestedMetaItem::Literal.
76 pub fn literal(&self) -> Option<&Lit> {
78 NestedMetaItem::Literal(ref lit) => Some(lit),
83 /// Returns `true` if this list item is a MetaItem with a name of `name`.
84 pub fn check_name(&self, name: &str) -> bool {
85 self.meta_item().map_or(false, |meta_item| meta_item.check_name(name))
88 /// For a single-segment meta-item returns its name, otherwise returns `None`.
89 pub fn ident(&self) -> Option<Ident> {
90 self.meta_item().and_then(|meta_item| meta_item.ident())
92 pub fn ident_str(&self) -> Option<&str> {
93 self.ident().map(|name| name.as_str().get())
96 /// Gets the string value if self is a MetaItem and the MetaItem is a
97 /// MetaItemKind::NameValue variant containing a string, otherwise None.
98 pub fn value_str(&self) -> Option<Symbol> {
99 self.meta_item().and_then(|meta_item| meta_item.value_str())
102 /// Returns a name and single literal value tuple of the MetaItem.
103 pub fn name_value_literal(&self) -> Option<(Name, &Lit)> {
104 self.meta_item().and_then(
105 |meta_item| meta_item.meta_item_list().and_then(
107 if meta_item_list.len() == 1 {
108 if let Some(ident) = meta_item.ident() {
109 if let Some(lit) = meta_item_list[0].literal() {
110 return Some((ident.name, lit));
118 /// Gets a list of inner meta items from a list MetaItem type.
119 pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]> {
120 self.meta_item().and_then(|meta_item| meta_item.meta_item_list())
123 /// Returns `true` if the variant is MetaItem.
124 pub fn is_meta_item(&self) -> bool {
125 self.meta_item().is_some()
128 /// Returns `true` if the variant is Literal.
129 pub fn is_literal(&self) -> bool {
130 self.literal().is_some()
133 /// Returns `true` if self is a MetaItem and the meta item is a word.
134 pub fn is_word(&self) -> bool {
135 self.meta_item().map_or(false, |meta_item| meta_item.is_word())
138 /// Returns `true` if self is a MetaItem and the meta item is a ValueString.
139 pub fn is_value_str(&self) -> bool {
140 self.value_str().is_some()
143 /// Returns `true` if self is a MetaItem and the meta item is a list.
144 pub fn is_meta_item_list(&self) -> bool {
145 self.meta_item_list().is_some()
150 /// Returns `true` if the attribute's path matches the argument. If it matches, then the
151 /// attribute is marked as used.
153 /// To check the attribute name without marking it used, use the `path` field directly.
154 pub fn check_name(&self, name: &str) -> bool {
155 let matches = self.path == name;
162 /// For a single-segment attribute returns its name, otherwise returns `None`.
163 pub fn ident(&self) -> Option<Ident> {
164 if self.path.segments.len() == 1 {
165 Some(self.path.segments[0].ident)
170 pub fn ident_str(&self) -> Option<&str> {
171 self.ident().map(|name| name.as_str().get())
174 pub fn value_str(&self) -> Option<Symbol> {
175 self.meta().and_then(|meta| meta.value_str())
178 pub fn meta_item_list(&self) -> Option<Vec<NestedMetaItem>> {
180 Some(MetaItem { node: MetaItemKind::List(list), .. }) => Some(list),
185 pub fn is_word(&self) -> bool {
186 self.tokens.is_empty()
189 pub fn is_meta_item_list(&self) -> bool {
190 self.meta_item_list().is_some()
193 /// Indicates if the attribute is a Value String.
194 pub fn is_value_str(&self) -> bool {
195 self.value_str().is_some()
200 /// For a single-segment meta-item returns its name, otherwise returns `None`.
201 pub fn ident(&self) -> Option<Ident> {
202 if self.path.segments.len() == 1 {
203 Some(self.path.segments[0].ident)
208 pub fn ident_str(&self) -> Option<&str> {
209 self.ident().map(|name| name.as_str().get())
212 // #[attribute(name = "value")]
214 pub fn name_value_literal(&self) -> Option<&Lit> {
216 MetaItemKind::NameValue(v) => Some(v),
221 pub fn value_str(&self) -> Option<Symbol> {
223 MetaItemKind::NameValue(ref v) => {
225 LitKind::Str(ref s, _) => Some(*s),
233 pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]> {
235 MetaItemKind::List(ref l) => Some(&l[..]),
240 pub fn is_word(&self) -> bool {
242 MetaItemKind::Word => true,
247 pub fn check_name(&self, name: &str) -> bool {
251 pub fn is_value_str(&self) -> bool {
252 self.value_str().is_some()
255 pub fn is_meta_item_list(&self) -> bool {
256 self.meta_item_list().is_some()
261 /// Extracts the MetaItem from inside this Attribute.
262 pub fn meta(&self) -> Option<MetaItem> {
263 let mut tokens = self.tokens.trees().peekable();
265 path: self.path.clone(),
266 node: if let Some(node) = MetaItemKind::from_tokens(&mut tokens) {
267 if tokens.peek().is_some() {
278 pub fn parse<'a, T, F>(&self, sess: &'a ParseSess, mut f: F) -> PResult<'a, T>
279 where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>,
281 let mut parser = Parser::new(sess, self.tokens.clone(), None, false, false);
282 let result = f(&mut parser)?;
283 if parser.token != token::Eof {
284 parser.unexpected()?;
289 pub fn parse_list<'a, T, F>(&self, sess: &'a ParseSess, mut f: F) -> PResult<'a, Vec<T>>
290 where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>,
292 if self.tokens.is_empty() {
293 return Ok(Vec::new());
295 self.parse(sess, |parser| {
296 parser.expect(&token::OpenDelim(token::Paren))?;
297 let mut list = Vec::new();
298 while !parser.eat(&token::CloseDelim(token::Paren)) {
299 list.push(f(parser)?);
300 if !parser.eat(&token::Comma) {
301 parser.expect(&token::CloseDelim(token::Paren))?;
309 pub fn parse_meta<'a>(&self, sess: &'a ParseSess) -> PResult<'a, MetaItem> {
311 path: self.path.clone(),
312 node: self.parse(sess, |parser| parser.parse_meta_item_kind())?,
317 /// Converts self to a normal #[doc="foo"] comment, if it is a
318 /// comment like `///` or `/** */`. (Returns self unchanged for
319 /// non-sugared doc attributes.)
320 pub fn with_desugared_doc<T, F>(&self, f: F) -> T where
321 F: FnOnce(&Attribute) -> T,
323 if self.is_sugared_doc {
324 let comment = self.value_str().unwrap();
325 let meta = mk_name_value_item_str(
326 Ident::from_str("doc"),
327 dummy_spanned(Symbol::intern(&strip_doc_comment_decoration(&comment.as_str()))));
328 let mut attr = if self.style == ast::AttrStyle::Outer {
329 mk_attr_outer(self.span, self.id, meta)
331 mk_attr_inner(self.span, self.id, meta)
333 attr.is_sugared_doc = true;
343 pub fn mk_name_value_item_str(ident: Ident, value: Spanned<Symbol>) -> MetaItem {
344 let value = respan(value.span, LitKind::Str(value.node, ast::StrStyle::Cooked));
345 mk_name_value_item(ident.span.to(value.span), ident, value)
348 pub fn mk_name_value_item(span: Span, ident: Ident, value: ast::Lit) -> MetaItem {
349 MetaItem { path: Path::from_ident(ident), span, node: MetaItemKind::NameValue(value) }
352 pub fn mk_list_item(span: Span, ident: Ident, items: Vec<NestedMetaItem>) -> MetaItem {
353 MetaItem { path: Path::from_ident(ident), span, node: MetaItemKind::List(items) }
356 pub fn mk_word_item(ident: Ident) -> MetaItem {
357 MetaItem { path: Path::from_ident(ident), span: ident.span, node: MetaItemKind::Word }
360 pub fn mk_nested_word_item(ident: Ident) -> NestedMetaItem {
361 NestedMetaItem::MetaItem(mk_word_item(ident))
364 pub fn mk_attr_id() -> AttrId {
365 use std::sync::atomic::AtomicUsize;
366 use std::sync::atomic::Ordering;
368 static NEXT_ATTR_ID: AtomicUsize = AtomicUsize::new(0);
370 let id = NEXT_ATTR_ID.fetch_add(1, Ordering::SeqCst);
371 assert!(id != ::std::usize::MAX);
375 /// Returns an inner attribute with the given value.
376 pub fn mk_attr_inner(span: Span, id: AttrId, item: MetaItem) -> Attribute {
377 mk_spanned_attr_inner(span, id, item)
380 /// Returns an inner attribute with the given value and span.
381 pub fn mk_spanned_attr_inner(sp: Span, id: AttrId, item: MetaItem) -> Attribute {
384 style: ast::AttrStyle::Inner,
386 tokens: item.node.tokens(item.span),
387 is_sugared_doc: false,
392 /// Returns an outer attribute with the given value.
393 pub fn mk_attr_outer(span: Span, id: AttrId, item: MetaItem) -> Attribute {
394 mk_spanned_attr_outer(span, id, item)
397 /// Returns an outer attribute with the given value and span.
398 pub fn mk_spanned_attr_outer(sp: Span, id: AttrId, item: MetaItem) -> Attribute {
401 style: ast::AttrStyle::Outer,
403 tokens: item.node.tokens(item.span),
404 is_sugared_doc: false,
409 pub fn mk_sugared_doc_attr(id: AttrId, text: Symbol, span: Span) -> Attribute {
410 let style = doc_comment_style(&text.as_str());
411 let lit = respan(span, LitKind::Str(text, ast::StrStyle::Cooked));
415 path: Path::from_ident(Ident::from_str("doc").with_span_pos(span)),
416 tokens: MetaItemKind::NameValue(lit).tokens(span),
417 is_sugared_doc: true,
422 pub fn list_contains_name(items: &[NestedMetaItem], name: &str) -> bool {
423 items.iter().any(|item| {
424 item.check_name(name)
428 pub fn contains_name(attrs: &[Attribute], name: &str) -> bool {
429 attrs.iter().any(|item| {
430 item.check_name(name)
434 pub fn find_by_name<'a>(attrs: &'a [Attribute], name: &str) -> Option<&'a Attribute> {
435 attrs.iter().find(|attr| attr.check_name(name))
438 pub fn filter_by_name<'a>(attrs: &'a [Attribute], name: &'a str)
439 -> impl Iterator<Item = &'a Attribute> {
440 attrs.iter().filter(move |attr| attr.check_name(name))
443 pub fn first_attr_value_str_by_name(attrs: &[Attribute], name: &str) -> Option<Symbol> {
445 .find(|at| at.check_name(name))
446 .and_then(|at| at.value_str())
450 fn tokens(&self) -> TokenStream {
451 let mut idents = vec![];
452 let mut last_pos = BytePos(0 as u32);
453 for (i, segment) in self.path.segments.iter().enumerate() {
454 let is_first = i == 0;
456 let mod_sep_span = Span::new(last_pos,
457 segment.ident.span.lo(),
458 segment.ident.span.ctxt());
459 idents.push(TokenTree::Token(mod_sep_span, Token::ModSep).into());
461 idents.push(TokenTree::Token(segment.ident.span,
462 Token::from_ast_ident(segment.ident)).into());
463 last_pos = segment.ident.span.hi();
465 self.node.tokens(self.span).append_to_tree_and_joint_vec(&mut idents);
466 TokenStream::new(idents)
469 fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItem>
470 where I: Iterator<Item = TokenTree>,
472 // FIXME: Share code with `parse_path`.
473 let path = match tokens.next() {
474 Some(TokenTree::Token(span, token @ Token::Ident(..))) |
475 Some(TokenTree::Token(span, token @ Token::ModSep)) => 'arm: {
476 let mut segments = if let Token::Ident(ident, _) = token {
477 if let Some(TokenTree::Token(_, Token::ModSep)) = tokens.peek() {
479 vec![PathSegment::from_ident(ident.with_span_pos(span))]
481 break 'arm Path::from_ident(ident.with_span_pos(span));
484 vec![PathSegment::path_root(span)]
487 if let Some(TokenTree::Token(span,
488 Token::Ident(ident, _))) = tokens.next() {
489 segments.push(PathSegment::from_ident(ident.with_span_pos(span)));
493 if let Some(TokenTree::Token(_, Token::ModSep)) = tokens.peek() {
499 let span = span.with_hi(segments.last().unwrap().ident.span.hi());
500 Path { span, segments }
502 Some(TokenTree::Token(_, Token::Interpolated(nt))) => match *nt {
503 token::Nonterminal::NtIdent(ident, _) => Path::from_ident(ident),
504 token::Nonterminal::NtMeta(ref meta) => return Some(meta.clone()),
505 token::Nonterminal::NtPath(ref path) => path.clone(),
510 let list_closing_paren_pos = tokens.peek().map(|tt| tt.span().hi());
511 let node = MetaItemKind::from_tokens(tokens)?;
512 let hi = match node {
513 MetaItemKind::NameValue(ref lit) => lit.span.hi(),
514 MetaItemKind::List(..) => list_closing_paren_pos.unwrap_or(path.span.hi()),
517 let span = path.span.with_hi(hi);
518 Some(MetaItem { path, node, span })
523 pub fn tokens(&self, span: Span) -> TokenStream {
525 MetaItemKind::Word => TokenStream::empty(),
526 MetaItemKind::NameValue(ref lit) => {
527 let mut vec = vec![TokenTree::Token(span, Token::Eq).into()];
528 lit.tokens().append_to_tree_and_joint_vec(&mut vec);
529 TokenStream::new(vec)
531 MetaItemKind::List(ref list) => {
532 let mut tokens = Vec::new();
533 for (i, item) in list.iter().enumerate() {
535 tokens.push(TokenTree::Token(span, Token::Comma).into());
537 item.tokens().append_to_tree_and_joint_vec(&mut tokens);
539 TokenTree::Delimited(
540 DelimSpan::from_single(span),
542 TokenStream::new(tokens).into(),
548 fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItemKind>
549 where I: Iterator<Item = TokenTree>,
551 let delimited = match tokens.peek().cloned() {
552 Some(TokenTree::Token(_, token::Eq)) => {
554 return if let Some(TokenTree::Token(span, token)) = tokens.next() {
555 LitKind::from_token(token)
556 .map(|lit| MetaItemKind::NameValue(Spanned { node: lit, span: span }))
561 Some(TokenTree::Delimited(_, delim, ref tts)) if delim == token::Paren => {
565 _ => return Some(MetaItemKind::Word),
568 let mut tokens = delimited.into_trees().peekable();
569 let mut result = Vec::new();
570 while let Some(..) = tokens.peek() {
571 let item = NestedMetaItem::from_tokens(&mut tokens)?;
573 match tokens.next() {
574 None | Some(TokenTree::Token(_, Token::Comma)) => {}
578 Some(MetaItemKind::List(result))
582 impl NestedMetaItem {
583 pub fn span(&self) -> Span {
585 NestedMetaItem::MetaItem(ref item) => item.span,
586 NestedMetaItem::Literal(ref lit) => lit.span,
590 fn tokens(&self) -> TokenStream {
592 NestedMetaItem::MetaItem(ref item) => item.tokens(),
593 NestedMetaItem::Literal(ref lit) => lit.tokens(),
597 fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<NestedMetaItem>
598 where I: Iterator<Item = TokenTree>,
600 if let Some(TokenTree::Token(span, token)) = tokens.peek().cloned() {
601 if let Some(node) = LitKind::from_token(token) {
603 return Some(NestedMetaItem::Literal(respan(span, node)));
607 MetaItem::from_tokens(tokens).map(NestedMetaItem::MetaItem)
612 crate fn tokens(&self) -> TokenStream {
613 TokenTree::Token(self.span, self.node.token()).into()
618 fn token(&self) -> Token {
622 LitKind::Str(string, ast::StrStyle::Cooked) => {
623 let escaped = string.as_str().escape_default().to_string();
624 Token::Literal(token::Lit::Str_(Symbol::intern(&escaped)), None)
626 LitKind::Str(string, ast::StrStyle::Raw(n)) => {
627 Token::Literal(token::Lit::StrRaw(string, n), None)
629 LitKind::ByteStr(ref bytes) => {
630 let string = bytes.iter().cloned().flat_map(ascii::escape_default)
631 .map(Into::<char>::into).collect::<String>();
632 Token::Literal(token::Lit::ByteStr(Symbol::intern(&string)), None)
634 LitKind::Byte(byte) => {
635 let string: String = ascii::escape_default(byte).map(Into::<char>::into).collect();
636 Token::Literal(token::Lit::Byte(Symbol::intern(&string)), None)
638 LitKind::Char(ch) => {
639 let string: String = ch.escape_default().map(Into::<char>::into).collect();
640 Token::Literal(token::Lit::Char(Symbol::intern(&string)), None)
642 LitKind::Int(n, ty) => {
643 let suffix = match ty {
644 ast::LitIntType::Unsigned(ty) => Some(Symbol::intern(ty.ty_to_string())),
645 ast::LitIntType::Signed(ty) => Some(Symbol::intern(ty.ty_to_string())),
646 ast::LitIntType::Unsuffixed => None,
648 Token::Literal(token::Lit::Integer(Symbol::intern(&n.to_string())), suffix)
650 LitKind::Float(symbol, ty) => {
651 Token::Literal(token::Lit::Float(symbol), Some(Symbol::intern(ty.ty_to_string())))
653 LitKind::FloatUnsuffixed(symbol) => Token::Literal(token::Lit::Float(symbol), None),
654 LitKind::Bool(value) => Token::Ident(Ident::with_empty_ctxt(Symbol::intern(if value {
659 LitKind::Err(val) => Token::Literal(token::Lit::Err(val), None),
663 fn from_token(token: Token) -> Option<LitKind> {
665 Token::Ident(ident, false) if ident.name == "true" => Some(LitKind::Bool(true)),
666 Token::Ident(ident, false) if ident.name == "false" => Some(LitKind::Bool(false)),
667 Token::Interpolated(nt) => match *nt {
668 token::NtExpr(ref v) | token::NtLiteral(ref v) => match v.node {
669 ExprKind::Lit(ref lit) => Some(lit.node.clone()),
674 Token::Literal(lit, suf) => {
675 let (suffix_illegal, result) = parse::lit_token(lit, suf, None);
676 if suffix_illegal && suf.is_some() {
686 pub trait HasAttrs: Sized {
687 fn attrs(&self) -> &[ast::Attribute];
688 fn visit_attrs<F: FnOnce(&mut Vec<ast::Attribute>)>(&mut self, f: F);
691 impl<T: HasAttrs> HasAttrs for Spanned<T> {
692 fn attrs(&self) -> &[ast::Attribute] { self.node.attrs() }
693 fn visit_attrs<F: FnOnce(&mut Vec<ast::Attribute>)>(&mut self, f: F) {
694 self.node.visit_attrs(f);
698 impl HasAttrs for Vec<Attribute> {
699 fn attrs(&self) -> &[Attribute] {
702 fn visit_attrs<F: FnOnce(&mut Vec<Attribute>)>(&mut self, f: F) {
707 impl HasAttrs for ThinVec<Attribute> {
708 fn attrs(&self) -> &[Attribute] {
711 fn visit_attrs<F: FnOnce(&mut Vec<Attribute>)>(&mut self, f: F) {
712 visit_clobber(self, |this| {
713 let mut vec = this.into();
720 impl<T: HasAttrs + 'static> HasAttrs for P<T> {
721 fn attrs(&self) -> &[Attribute] {
724 fn visit_attrs<F: FnOnce(&mut Vec<Attribute>)>(&mut self, f: F) {
725 (**self).visit_attrs(f);
729 impl HasAttrs for StmtKind {
730 fn attrs(&self) -> &[Attribute] {
732 StmtKind::Local(ref local) => local.attrs(),
733 StmtKind::Item(..) => &[],
734 StmtKind::Expr(ref expr) | StmtKind::Semi(ref expr) => expr.attrs(),
735 StmtKind::Mac(ref mac) => {
736 let (_, _, ref attrs) = **mac;
742 fn visit_attrs<F: FnOnce(&mut Vec<Attribute>)>(&mut self, f: F) {
744 StmtKind::Local(local) => local.visit_attrs(f),
745 StmtKind::Item(..) => {}
746 StmtKind::Expr(expr) => expr.visit_attrs(f),
747 StmtKind::Semi(expr) => expr.visit_attrs(f),
748 StmtKind::Mac(mac) => {
749 let (_mac, _style, attrs) = mac.deref_mut();
750 attrs.visit_attrs(f);
756 impl HasAttrs for Stmt {
757 fn attrs(&self) -> &[ast::Attribute] {
761 fn visit_attrs<F: FnOnce(&mut Vec<ast::Attribute>)>(&mut self, f: F) {
762 self.node.visit_attrs(f);
766 impl HasAttrs for GenericParam {
767 fn attrs(&self) -> &[ast::Attribute] {
771 fn visit_attrs<F: FnOnce(&mut Vec<Attribute>)>(&mut self, f: F) {
772 self.attrs.visit_attrs(f);
776 macro_rules! derive_has_attrs {
777 ($($ty:path),*) => { $(
778 impl HasAttrs for $ty {
779 fn attrs(&self) -> &[Attribute] {
783 fn visit_attrs<F: FnOnce(&mut Vec<Attribute>)>(&mut self, f: F) {
784 self.attrs.visit_attrs(f);
791 Item, Expr, Local, ast::ForeignItem, ast::StructField, ast::ImplItem, ast::TraitItem, ast::Arm,
792 ast::Field, ast::FieldPat, ast::Variant_
795 pub fn inject(mut krate: ast::Crate, parse_sess: &ParseSess, attrs: &[String]) -> ast::Crate {
796 for raw_attr in attrs {
797 let mut parser = parse::new_parser_from_source_str(
799 FileName::cli_crate_attr_source_code(&raw_attr),
803 let start_span = parser.span;
804 let (path, tokens) = panictry!(parser.parse_meta_item_unrestricted());
805 let end_span = parser.span;
806 if parser.token != token::Eof {
807 parse_sess.span_diagnostic
808 .span_err(start_span.to(end_span), "invalid crate attribute");
812 krate.attrs.push(Attribute {
814 style: AttrStyle::Inner,
817 is_sugared_doc: false,
818 span: start_span.to(end_span),