1 use crate::base::ExtCtxt;
5 use rustc_ast::token::Nonterminal;
6 use rustc_ast::token::NtIdent;
7 use rustc_ast::tokenstream::{self, CanSynthesizeMissingTokens};
8 use rustc_ast::tokenstream::{DelimSpan, Spacing::*, TokenStream, TreeAndSpacing};
9 use rustc_ast_pretty::pprust;
10 use rustc_data_structures::sync::Lrc;
11 use rustc_errors::Diagnostic;
12 use rustc_lint_defs::builtin::PROC_MACRO_BACK_COMPAT;
13 use rustc_lint_defs::BuiltinLintDiagnostics;
14 use rustc_parse::lexer::nfc_normalize;
15 use rustc_parse::{nt_to_tokenstream, parse_stream_from_source_str};
16 use rustc_session::parse::ParseSess;
17 use rustc_span::hygiene::ExpnKind;
18 use rustc_span::symbol::{self, kw, sym, Symbol};
19 use rustc_span::{BytePos, FileName, MultiSpan, Pos, RealFileName, SourceFile, Span};
21 use pm::bridge::{server, TokenTree};
22 use pm::{Delimiter, Level, LineColumn, Spacing};
24 use std::{ascii, panic};
26 trait FromInternal<T> {
27 fn from_internal(x: T) -> Self;
31 fn to_internal(self) -> T;
34 impl FromInternal<token::DelimToken> for Delimiter {
35 fn from_internal(delim: token::DelimToken) -> Delimiter {
37 token::Paren => Delimiter::Parenthesis,
38 token::Brace => Delimiter::Brace,
39 token::Bracket => Delimiter::Bracket,
40 token::NoDelim => Delimiter::None,
45 impl ToInternal<token::DelimToken> for Delimiter {
46 fn to_internal(self) -> token::DelimToken {
48 Delimiter::Parenthesis => token::Paren,
49 Delimiter::Brace => token::Brace,
50 Delimiter::Bracket => token::Bracket,
51 Delimiter::None => token::NoDelim,
56 impl FromInternal<(TreeAndSpacing, &'_ mut Vec<Self>, &mut Rustc<'_>)>
57 for TokenTree<Group, Punct, Ident, Literal>
60 ((tree, spacing), stack, rustc): (TreeAndSpacing, &mut Vec<Self>, &mut Rustc<'_>),
62 use rustc_ast::token::*;
64 let joint = spacing == Joint;
65 let Token { kind, span } = match tree {
66 tokenstream::TokenTree::Delimited(span, delim, tts) => {
67 let delimiter = Delimiter::from_internal(delim);
68 return TokenTree::Group(Group { delimiter, stream: tts, span, flatten: false });
70 tokenstream::TokenTree::Token(token) => token,
74 ($ty:ident { $($field:ident $(: $value:expr)*),+ $(,)? }) => (
75 TokenTree::$ty(self::$ty {
76 $($field $(: $value)*,)+
80 ($ty:ident::$method:ident($($value:expr),*)) => (
81 TokenTree::$ty(self::$ty::$method($($value,)* span))
86 tt!(Punct::new($a, joint))
88 ($a:expr, $b:expr) => {{
89 stack.push(tt!(Punct::new($b, joint)));
90 tt!(Punct::new($a, true))
92 ($a:expr, $b:expr, $c:expr) => {{
93 stack.push(tt!(Punct::new($c, joint)));
94 stack.push(tt!(Punct::new($b, true)));
95 tt!(Punct::new($a, true))
103 EqEq => op!('=', '='),
107 AndAnd => op!('&', '&'),
108 OrOr => op!('|', '|'),
111 BinOp(Plus) => op!('+'),
112 BinOp(Minus) => op!('-'),
113 BinOp(Star) => op!('*'),
114 BinOp(Slash) => op!('/'),
115 BinOp(Percent) => op!('%'),
116 BinOp(Caret) => op!('^'),
117 BinOp(And) => op!('&'),
118 BinOp(Or) => op!('|'),
119 BinOp(Shl) => op!('<', '<'),
120 BinOp(Shr) => op!('>', '>'),
121 BinOpEq(Plus) => op!('+', '='),
122 BinOpEq(Minus) => op!('-', '='),
123 BinOpEq(Star) => op!('*', '='),
124 BinOpEq(Slash) => op!('/', '='),
125 BinOpEq(Percent) => op!('%', '='),
126 BinOpEq(Caret) => op!('^', '='),
127 BinOpEq(And) => op!('&', '='),
128 BinOpEq(Or) => op!('|', '='),
129 BinOpEq(Shl) => op!('<', '<', '='),
130 BinOpEq(Shr) => op!('>', '>', '='),
133 DotDot => op!('.', '.'),
134 DotDotDot => op!('.', '.', '.'),
135 DotDotEq => op!('.', '.', '='),
139 ModSep => op!(':', ':'),
140 RArrow => op!('-', '>'),
141 LArrow => op!('<', '-'),
142 FatArrow => op!('=', '>'),
145 Question => op!('?'),
146 SingleQuote => op!('\''),
148 Ident(name, false) if name == kw::DollarCrate => tt!(Ident::dollar_crate()),
149 Ident(name, is_raw) => tt!(Ident::new(rustc.sess, name, is_raw)),
151 let ident = symbol::Ident::new(name, span).without_first_quote();
152 stack.push(tt!(Ident::new(rustc.sess, ident.name, false)));
153 tt!(Punct::new('\'', true))
155 Literal(lit) => tt!(Literal { lit }),
156 DocComment(_, attr_style, data) => {
157 let mut escaped = String::new();
158 for ch in data.as_str().chars() {
159 escaped.extend(ch.escape_debug());
162 Ident(sym::doc, false),
164 TokenKind::lit(token::Str, Symbol::intern(&escaped), None),
167 .map(|kind| tokenstream::TokenTree::token(kind, span))
169 stack.push(TokenTree::Group(Group {
170 delimiter: Delimiter::Bracket,
172 span: DelimSpan::from_single(span),
175 if attr_style == ast::AttrStyle::Inner {
176 stack.push(tt!(Punct::new('!', false)));
178 tt!(Punct::new('#', false))
181 Interpolated(nt) => {
182 if let Some((name, is_raw)) = ident_name_compatibility_hack(&nt, span, rustc) {
183 TokenTree::Ident(Ident::new(rustc.sess, name.name, is_raw, name.span))
185 let stream = nt_to_tokenstream(&nt, rustc.sess, CanSynthesizeMissingTokens::No);
186 TokenTree::Group(Group {
187 delimiter: Delimiter::None,
189 span: DelimSpan::from_single(span),
190 flatten: crate::base::pretty_printing_compatibility_hack(&nt, rustc.sess),
195 OpenDelim(..) | CloseDelim(..) => unreachable!(),
196 Eof => unreachable!(),
201 impl ToInternal<TokenStream> for TokenTree<Group, Punct, Ident, Literal> {
202 fn to_internal(self) -> TokenStream {
203 use rustc_ast::token::*;
205 let (ch, joint, span) = match self {
206 TokenTree::Punct(Punct { ch, joint, span }) => (ch, joint, span),
207 TokenTree::Group(Group { delimiter, stream, span, .. }) => {
208 return tokenstream::TokenTree::Delimited(span, delimiter.to_internal(), stream)
211 TokenTree::Ident(self::Ident { sym, is_raw, span }) => {
212 return tokenstream::TokenTree::token(Ident(sym, is_raw), span).into();
214 TokenTree::Literal(self::Literal {
215 lit: token::Lit { kind: token::Integer, symbol, suffix },
217 }) if symbol.as_str().starts_with('-') => {
218 let minus = BinOp(BinOpToken::Minus);
219 let symbol = Symbol::intern(&symbol.as_str()[1..]);
220 let integer = TokenKind::lit(token::Integer, symbol, suffix);
221 let a = tokenstream::TokenTree::token(minus, span);
222 let b = tokenstream::TokenTree::token(integer, span);
223 return vec![a, b].into_iter().collect();
225 TokenTree::Literal(self::Literal {
226 lit: token::Lit { kind: token::Float, symbol, suffix },
228 }) if symbol.as_str().starts_with('-') => {
229 let minus = BinOp(BinOpToken::Minus);
230 let symbol = Symbol::intern(&symbol.as_str()[1..]);
231 let float = TokenKind::lit(token::Float, symbol, suffix);
232 let a = tokenstream::TokenTree::token(minus, span);
233 let b = tokenstream::TokenTree::token(float, span);
234 return vec![a, b].into_iter().collect();
236 TokenTree::Literal(self::Literal { lit, span }) => {
237 return tokenstream::TokenTree::token(Literal(lit), span).into();
241 let kind = match ch {
251 '%' => BinOp(Percent),
267 let tree = tokenstream::TokenTree::token(kind, span);
268 TokenStream::new(vec![(tree, if joint { Joint } else { Alone })])
272 impl ToInternal<rustc_errors::Level> for Level {
273 fn to_internal(self) -> rustc_errors::Level {
275 Level::Error => rustc_errors::Level::Error,
276 Level::Warning => rustc_errors::Level::Warning,
277 Level::Note => rustc_errors::Level::Note,
278 Level::Help => rustc_errors::Level::Help,
279 _ => unreachable!("unknown proc_macro::Level variant: {:?}", self),
284 pub struct FreeFunctions;
287 pub struct TokenStreamIter {
288 cursor: tokenstream::Cursor,
289 stack: Vec<TokenTree<Group, Punct, Ident, Literal>>,
294 delimiter: Delimiter,
297 /// A hack used to pass AST fragments to attribute and derive macros
298 /// as a single nonterminal token instead of a token stream.
299 /// FIXME: It needs to be removed, but there are some compatibility issues (see #73345).
303 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
306 // NB. not using `Spacing` here because it doesn't implement `Hash`.
312 fn new(ch: char, joint: bool, span: Span) -> Punct {
313 const LEGAL_CHARS: &[char] = &[
314 '=', '<', '>', '!', '~', '+', '-', '*', '/', '%', '^', '&', '|', '@', '.', ',', ';',
315 ':', '#', '$', '?', '\'',
317 if !LEGAL_CHARS.contains(&ch) {
318 panic!("unsupported character `{:?}`", ch)
320 Punct { ch, joint, span }
324 #[derive(Copy, Clone, PartialEq, Eq, Hash)]
332 fn new(sess: &ParseSess, sym: Symbol, is_raw: bool, span: Span) -> Ident {
333 let sym = nfc_normalize(&sym.as_str());
334 let string = sym.as_str();
335 if !rustc_lexer::is_ident(&string) {
336 panic!("`{:?}` is not a valid identifier", string)
338 if is_raw && !sym.can_be_raw() {
339 panic!("`{}` cannot be a raw identifier", string);
341 sess.symbol_gallery.insert(sym, span);
342 Ident { sym, is_raw, span }
344 fn dollar_crate(span: Span) -> Ident {
345 // `$crate` is accepted as an ident only if it comes from the compiler.
346 Ident { sym: kw::DollarCrate, is_raw: false, span }
350 // FIXME(eddyb) `Literal` should not expose internal `Debug` impls.
351 #[derive(Clone, Debug)]
357 pub(crate) struct Rustc<'a> {
366 pub fn new(cx: &'a ExtCtxt<'_>) -> Self {
367 let expn_data = cx.current_expansion.id.expn_data();
369 sess: &cx.sess.parse_sess,
370 def_site: cx.with_def_site_ctxt(expn_data.def_site),
371 call_site: cx.with_call_site_ctxt(expn_data.call_site),
372 mixed_site: cx.with_mixed_site_ctxt(expn_data.call_site),
373 span_debug: cx.ecfg.span_debug,
377 fn lit(&mut self, kind: token::LitKind, symbol: Symbol, suffix: Option<Symbol>) -> Literal {
378 Literal { lit: token::Lit::new(kind, symbol, suffix), span: server::Span::call_site(self) }
382 impl server::Types for Rustc<'_> {
383 type FreeFunctions = FreeFunctions;
384 type TokenStream = TokenStream;
385 type TokenStreamBuilder = tokenstream::TokenStreamBuilder;
386 type TokenStreamIter = TokenStreamIter;
390 type Literal = Literal;
391 type SourceFile = Lrc<SourceFile>;
392 type MultiSpan = Vec<Span>;
393 type Diagnostic = Diagnostic;
397 impl server::FreeFunctions for Rustc<'_> {
398 fn track_env_var(&mut self, var: &str, value: Option<&str>) {
399 self.sess.env_depinfo.borrow_mut().insert((Symbol::intern(var), value.map(Symbol::intern)));
403 impl server::TokenStream for Rustc<'_> {
404 fn new(&mut self) -> Self::TokenStream {
405 TokenStream::default()
407 fn is_empty(&mut self, stream: &Self::TokenStream) -> bool {
410 fn from_str(&mut self, src: &str) -> Self::TokenStream {
411 parse_stream_from_source_str(
412 FileName::proc_macro_source_code(src),
415 Some(self.call_site),
418 fn to_string(&mut self, stream: &Self::TokenStream) -> String {
419 pprust::tts_to_string(stream)
423 tree: TokenTree<Self::Group, Self::Punct, Self::Ident, Self::Literal>,
424 ) -> Self::TokenStream {
427 fn into_iter(&mut self, stream: Self::TokenStream) -> Self::TokenStreamIter {
428 TokenStreamIter { cursor: stream.trees(), stack: vec![] }
432 impl server::TokenStreamBuilder for Rustc<'_> {
433 fn new(&mut self) -> Self::TokenStreamBuilder {
434 tokenstream::TokenStreamBuilder::new()
436 fn push(&mut self, builder: &mut Self::TokenStreamBuilder, stream: Self::TokenStream) {
437 builder.push(stream);
439 fn build(&mut self, builder: Self::TokenStreamBuilder) -> Self::TokenStream {
444 impl server::TokenStreamIter for Rustc<'_> {
447 iter: &mut Self::TokenStreamIter,
448 ) -> Option<TokenTree<Self::Group, Self::Punct, Self::Ident, Self::Literal>> {
450 let tree = iter.stack.pop().or_else(|| {
451 let next = iter.cursor.next_with_spacing()?;
452 Some(TokenTree::from_internal((next, &mut iter.stack, self)))
454 // A hack used to pass AST fragments to attribute and derive macros
455 // as a single nonterminal token instead of a token stream.
456 // Such token needs to be "unwrapped" and not represented as a delimited group.
457 // FIXME: It needs to be removed, but there are some compatibility issues (see #73345).
458 if let TokenTree::Group(ref group) = tree {
460 iter.cursor.append(group.stream.clone());
469 impl server::Group for Rustc<'_> {
470 fn new(&mut self, delimiter: Delimiter, stream: Self::TokenStream) -> Self::Group {
474 span: DelimSpan::from_single(server::Span::call_site(self)),
478 fn delimiter(&mut self, group: &Self::Group) -> Delimiter {
481 fn stream(&mut self, group: &Self::Group) -> Self::TokenStream {
484 fn span(&mut self, group: &Self::Group) -> Self::Span {
487 fn span_open(&mut self, group: &Self::Group) -> Self::Span {
490 fn span_close(&mut self, group: &Self::Group) -> Self::Span {
493 fn set_span(&mut self, group: &mut Self::Group, span: Self::Span) {
494 group.span = DelimSpan::from_single(span);
498 impl server::Punct for Rustc<'_> {
499 fn new(&mut self, ch: char, spacing: Spacing) -> Self::Punct {
500 Punct::new(ch, spacing == Spacing::Joint, server::Span::call_site(self))
502 fn as_char(&mut self, punct: Self::Punct) -> char {
505 fn spacing(&mut self, punct: Self::Punct) -> Spacing {
506 if punct.joint { Spacing::Joint } else { Spacing::Alone }
508 fn span(&mut self, punct: Self::Punct) -> Self::Span {
511 fn with_span(&mut self, punct: Self::Punct, span: Self::Span) -> Self::Punct {
512 Punct { span, ..punct }
516 impl server::Ident for Rustc<'_> {
517 fn new(&mut self, string: &str, span: Self::Span, is_raw: bool) -> Self::Ident {
518 Ident::new(self.sess, Symbol::intern(string), is_raw, span)
520 fn span(&mut self, ident: Self::Ident) -> Self::Span {
523 fn with_span(&mut self, ident: Self::Ident, span: Self::Span) -> Self::Ident {
524 Ident { span, ..ident }
528 impl server::Literal for Rustc<'_> {
529 fn debug_kind(&mut self, literal: &Self::Literal) -> String {
530 format!("{:?}", literal.lit.kind)
532 fn symbol(&mut self, literal: &Self::Literal) -> String {
533 literal.lit.symbol.to_string()
535 fn suffix(&mut self, literal: &Self::Literal) -> Option<String> {
536 literal.lit.suffix.as_ref().map(Symbol::to_string)
538 fn integer(&mut self, n: &str) -> Self::Literal {
539 self.lit(token::Integer, Symbol::intern(n), None)
541 fn typed_integer(&mut self, n: &str, kind: &str) -> Self::Literal {
542 self.lit(token::Integer, Symbol::intern(n), Some(Symbol::intern(kind)))
544 fn float(&mut self, n: &str) -> Self::Literal {
545 self.lit(token::Float, Symbol::intern(n), None)
547 fn f32(&mut self, n: &str) -> Self::Literal {
548 self.lit(token::Float, Symbol::intern(n), Some(sym::f32))
550 fn f64(&mut self, n: &str) -> Self::Literal {
551 self.lit(token::Float, Symbol::intern(n), Some(sym::f64))
553 fn string(&mut self, string: &str) -> Self::Literal {
554 let mut escaped = String::new();
555 for ch in string.chars() {
556 escaped.extend(ch.escape_debug());
558 self.lit(token::Str, Symbol::intern(&escaped), None)
560 fn character(&mut self, ch: char) -> Self::Literal {
561 let mut escaped = String::new();
562 escaped.extend(ch.escape_unicode());
563 self.lit(token::Char, Symbol::intern(&escaped), None)
565 fn byte_string(&mut self, bytes: &[u8]) -> Self::Literal {
569 .flat_map(ascii::escape_default)
570 .map(Into::<char>::into)
571 .collect::<String>();
572 self.lit(token::ByteStr, Symbol::intern(&string), None)
574 fn span(&mut self, literal: &Self::Literal) -> Self::Span {
577 fn set_span(&mut self, literal: &mut Self::Literal, span: Self::Span) {
582 literal: &Self::Literal,
585 ) -> Option<Self::Span> {
586 let span = literal.span;
587 let length = span.hi().to_usize() - span.lo().to_usize();
589 let start = match start {
590 Bound::Included(lo) => lo,
591 Bound::Excluded(lo) => lo.checked_add(1)?,
592 Bound::Unbounded => 0,
595 let end = match end {
596 Bound::Included(hi) => hi.checked_add(1)?,
597 Bound::Excluded(hi) => hi,
598 Bound::Unbounded => length,
601 // Bounds check the values, preventing addition overflow and OOB spans.
602 if start > u32::MAX as usize
603 || end > u32::MAX as usize
604 || (u32::MAX - start as u32) < span.lo().to_u32()
605 || (u32::MAX - end as u32) < span.lo().to_u32()
612 let new_lo = span.lo() + BytePos::from_usize(start);
613 let new_hi = span.lo() + BytePos::from_usize(end);
614 Some(span.with_lo(new_lo).with_hi(new_hi))
618 impl server::SourceFile for Rustc<'_> {
619 fn eq(&mut self, file1: &Self::SourceFile, file2: &Self::SourceFile) -> bool {
620 Lrc::ptr_eq(file1, file2)
622 fn path(&mut self, file: &Self::SourceFile) -> String {
624 FileName::Real(ref name) => name
627 .expect("non-UTF8 file path in `proc_macro::SourceFile::path`")
629 _ => file.name.to_string(),
632 fn is_real(&mut self, file: &Self::SourceFile) -> bool {
637 impl server::MultiSpan for Rustc<'_> {
638 fn new(&mut self) -> Self::MultiSpan {
641 fn push(&mut self, spans: &mut Self::MultiSpan, span: Self::Span) {
646 impl server::Diagnostic for Rustc<'_> {
647 fn new(&mut self, level: Level, msg: &str, spans: Self::MultiSpan) -> Self::Diagnostic {
648 let mut diag = Diagnostic::new(level.to_internal(), msg);
649 diag.set_span(MultiSpan::from_spans(spans));
654 diag: &mut Self::Diagnostic,
657 spans: Self::MultiSpan,
659 diag.sub(level.to_internal(), msg, MultiSpan::from_spans(spans), None);
661 fn emit(&mut self, diag: Self::Diagnostic) {
662 self.sess.span_diagnostic.emit_diagnostic(&diag);
666 impl server::Span for Rustc<'_> {
667 fn debug(&mut self, span: Self::Span) -> String {
669 format!("{:?}", span)
671 format!("{:?} bytes({}..{})", span.ctxt(), span.lo().0, span.hi().0)
674 fn def_site(&mut self) -> Self::Span {
677 fn call_site(&mut self) -> Self::Span {
680 fn mixed_site(&mut self) -> Self::Span {
683 fn source_file(&mut self, span: Self::Span) -> Self::SourceFile {
684 self.sess.source_map().lookup_char_pos(span.lo()).file
686 fn parent(&mut self, span: Self::Span) -> Option<Self::Span> {
689 fn source(&mut self, span: Self::Span) -> Self::Span {
690 span.source_callsite()
692 fn start(&mut self, span: Self::Span) -> LineColumn {
693 let loc = self.sess.source_map().lookup_char_pos(span.lo());
694 LineColumn { line: loc.line, column: loc.col.to_usize() }
696 fn end(&mut self, span: Self::Span) -> LineColumn {
697 let loc = self.sess.source_map().lookup_char_pos(span.hi());
698 LineColumn { line: loc.line, column: loc.col.to_usize() }
700 fn join(&mut self, first: Self::Span, second: Self::Span) -> Option<Self::Span> {
701 let self_loc = self.sess.source_map().lookup_char_pos(first.lo());
702 let other_loc = self.sess.source_map().lookup_char_pos(second.lo());
704 if self_loc.file.name != other_loc.file.name {
708 Some(first.to(second))
710 fn resolved_at(&mut self, span: Self::Span, at: Self::Span) -> Self::Span {
711 span.with_ctxt(at.ctxt())
713 fn source_text(&mut self, span: Self::Span) -> Option<String> {
714 self.sess.source_map().span_to_snippet(span).ok()
718 // See issue #74616 for details
719 fn ident_name_compatibility_hack(
722 rustc: &mut Rustc<'_>,
723 ) -> Option<(rustc_span::symbol::Ident, bool)> {
724 if let NtIdent(ident, is_raw) = nt {
725 if let ExpnKind::Macro(_, macro_name) = orig_span.ctxt().outer_expn_data().kind {
726 let source_map = rustc.sess.source_map();
727 let filename = source_map.span_to_filename(orig_span);
728 if let FileName::Real(RealFileName::Named(path)) = filename {
729 let matches_prefix = |prefix, filename| {
730 // Check for a path that ends with 'prefix*/src/<filename>'
731 let mut iter = path.components().rev();
732 iter.next().and_then(|p| p.as_os_str().to_str()) == Some(filename)
733 && iter.next().and_then(|p| p.as_os_str().to_str()) == Some("src")
736 .and_then(|p| p.as_os_str().to_str())
737 .map_or(false, |p| p.starts_with(prefix))
740 let time_macros_impl =
741 macro_name == sym::impl_macros && matches_prefix("time-macros-impl", "lib.rs");
742 let js_sys = macro_name == sym::arrays && matches_prefix("js-sys", "lib.rs");
743 if time_macros_impl || js_sys {
744 let snippet = source_map.span_to_snippet(orig_span);
745 if snippet.as_deref() == Ok("$name") {
746 if time_macros_impl {
747 rustc.sess.buffer_lint_with_diagnostic(
748 &PROC_MACRO_BACK_COMPAT,
751 "using an old version of `time-macros-impl`",
752 BuiltinLintDiagnostics::ProcMacroBackCompat(
753 "the `time-macros-impl` crate will stop compiling in futures version of Rust. \
754 Please update to the latest version of the `time` crate to avoid breakage".to_string())
756 return Some((*ident, *is_raw));
759 if let Some(c) = path
761 .flat_map(|c| c.as_os_str().to_str())
762 .find(|c| c.starts_with("js-sys"))
764 let mut version = c.trim_start_matches("js-sys-").split(".");
765 if version.next() == Some("0")
766 && version.next() == Some("3")
769 .and_then(|c| c.parse::<u32>().ok())
770 .map_or(false, |v| v < 40)
772 rustc.sess.buffer_lint_with_diagnostic(
773 &PROC_MACRO_BACK_COMPAT,
776 "using an old version of `js-sys`",
777 BuiltinLintDiagnostics::ProcMacroBackCompat(
778 "older versions of the `js-sys` crate will stop compiling in future versions of Rust; \
779 please update to `js-sys` v0.3.40 or above".to_string())
781 return Some((*ident, *is_raw));
788 if macro_name == sym::tuple_from_req && matches_prefix("actix-web", "extract.rs") {
789 let snippet = source_map.span_to_snippet(orig_span);
790 if snippet.as_deref() == Ok("$T") {
791 if let FileName::Real(RealFileName::Named(macro_path)) =
792 source_map.span_to_filename(rustc.def_site)
794 if macro_path.to_string_lossy().contains("pin-project-internal-0.") {
795 rustc.sess.buffer_lint_with_diagnostic(
796 &PROC_MACRO_BACK_COMPAT,
799 "using an old version of `actix-web`",
800 BuiltinLintDiagnostics::ProcMacroBackCompat(
801 "the version of `actix-web` you are using might stop compiling in future versions of Rust; \
802 please update to the latest version of the `actix-web` crate to avoid breakage".to_string())
804 return Some((*ident, *is_raw));