Deleted vendor folder

1 files changed, 0 insertions, 996 deletions

diff --git a/vendor/proc-macro2/src/parse.rs b/vendor/proc-macro2/src/parse.rs
deleted file mode 100644
index 07239bc..0000000
--- a/vendor/proc-macro2/src/parse.rs
+++ /dev/null
@@ -1,996 +0,0 @@
-use crate::fallback::{
-    self, is_ident_continue, is_ident_start, Group, LexError, Literal, Span, TokenStream,
-    TokenStreamBuilder,
-};
-use crate::{Delimiter, Punct, Spacing, TokenTree};
-use core::char;
-use core::str::{Bytes, CharIndices, Chars};
-
-#[derive(Copy, Clone, Eq, PartialEq)]
-pub(crate) struct Cursor<'a> {
-    pub rest: &'a str,
-    #[cfg(span_locations)]
-    pub off: u32,
-}
-
-impl<'a> Cursor<'a> {
-    pub fn advance(&self, bytes: usize) -> Cursor<'a> {
-        let (_front, rest) = self.rest.split_at(bytes);
-        Cursor {
-            rest,
-            #[cfg(span_locations)]
-            off: self.off + _front.chars().count() as u32,
-        }
-    }
-
-    pub fn starts_with(&self, s: &str) -> bool {
-        self.rest.starts_with(s)
-    }
-
-    pub fn starts_with_char(&self, ch: char) -> bool {
-        self.rest.starts_with(ch)
-    }
-
-    pub fn starts_with_fn<Pattern>(&self, f: Pattern) -> bool
-    where
-        Pattern: FnMut(char) -> bool,
-    {
-        self.rest.starts_with(f)
-    }
-
-    pub fn is_empty(&self) -> bool {
-        self.rest.is_empty()
-    }
-
-    fn len(&self) -> usize {
-        self.rest.len()
-    }
-
-    fn as_bytes(&self) -> &'a [u8] {
-        self.rest.as_bytes()
-    }
-
-    fn bytes(&self) -> Bytes<'a> {
-        self.rest.bytes()
-    }
-
-    fn chars(&self) -> Chars<'a> {
-        self.rest.chars()
-    }
-
-    fn char_indices(&self) -> CharIndices<'a> {
-        self.rest.char_indices()
-    }
-
-    fn parse(&self, tag: &str) -> Result<Cursor<'a>, Reject> {
-        if self.starts_with(tag) {
-            Ok(self.advance(tag.len()))
-        } else {
-            Err(Reject)
-        }
-    }
-}
-
-pub(crate) struct Reject;
-type PResult<'a, O> = Result<(Cursor<'a>, O), Reject>;
-
-fn skip_whitespace(input: Cursor) -> Cursor {
-    let mut s = input;
-
-    while !s.is_empty() {
-        let byte = s.as_bytes()[0];
-        if byte == b'/' {
-            if s.starts_with("//")
-                && (!s.starts_with("///") || s.starts_with("////"))
-                && !s.starts_with("//!")
-            {
-                let (cursor, _) = take_until_newline_or_eof(s);
-                s = cursor;
-                continue;
-            } else if s.starts_with("/**/") {
-                s = s.advance(4);
-                continue;
-            } else if s.starts_with("/*")
-                && (!s.starts_with("/**") || s.starts_with("/***"))
-                && !s.starts_with("/*!")
-            {
-                match block_comment(s) {
-                    Ok((rest, _)) => {
-                        s = rest;
-                        continue;
-                    }
-                    Err(Reject) => return s,
-                }
-            }
-        }
-        match byte {
-            b' ' | 0x09..=0x0d => {
-                s = s.advance(1);
-                continue;
-            }
-            b if b.is_ascii() => {}
-            _ => {
-                let ch = s.chars().next().unwrap();
-                if is_whitespace(ch) {
-                    s = s.advance(ch.len_utf8());
-                    continue;
-                }
-            }
-        }
-        return s;
-    }
-    s
-}
-
-fn block_comment(input: Cursor) -> PResult<&str> {
-    if !input.starts_with("/*") {
-        return Err(Reject);
-    }
-
-    let mut depth = 0usize;
-    let bytes = input.as_bytes();
-    let mut i = 0usize;
-    let upper = bytes.len() - 1;
-
-    while i < upper {
-        if bytes[i] == b'/' && bytes[i + 1] == b'*' {
-            depth += 1;
-            i += 1; // eat '*'
-        } else if bytes[i] == b'*' && bytes[i + 1] == b'/' {
-            depth -= 1;
-            if depth == 0 {
-                return Ok((input.advance(i + 2), &input.rest[..i + 2]));
-            }
-            i += 1; // eat '/'
-        }
-        i += 1;
-    }
-
-    Err(Reject)
-}
-
-fn is_whitespace(ch: char) -> bool {
-    // Rust treats left-to-right mark and right-to-left mark as whitespace
-    ch.is_whitespace() || ch == '\u{200e}' || ch == '\u{200f}'
-}
-
-fn word_break(input: Cursor) -> Result<Cursor, Reject> {
-    match input.chars().next() {
-        Some(ch) if is_ident_continue(ch) => Err(Reject),
-        Some(_) | None => Ok(input),
-    }
-}
-
-// Rustc's representation of a macro expansion error in expression position or
-// type position.
-const ERROR: &str = "(/*ERROR*/)";
-
-pub(crate) fn token_stream(mut input: Cursor) -> Result<TokenStream, LexError> {
-    let mut trees = TokenStreamBuilder::new();
-    let mut stack = Vec::new();
-
-    loop {
-        input = skip_whitespace(input);
-
-        if let Ok((rest, ())) = doc_comment(input, &mut trees) {
-            input = rest;
-            continue;
-        }
-
-        #[cfg(span_locations)]
-        let lo = input.off;
-
-        let first = match input.bytes().next() {
-            Some(first) => first,
-            None => match stack.last() {
-                None => return Ok(trees.build()),
-                #[cfg(span_locations)]
-                Some((lo, _frame)) => {
-                    return Err(LexError {
-                        span: Span { lo: *lo, hi: *lo },
-                    })
-                }
-                #[cfg(not(span_locations))]
-                Some(_frame) => return Err(LexError { span: Span {} }),
-            },
-        };
-
-        if let Some(open_delimiter) = match first {
-            b'(' if !input.starts_with(ERROR) => Some(Delimiter::Parenthesis),
-            b'[' => Some(Delimiter::Bracket),
-            b'{' => Some(Delimiter::Brace),
-            _ => None,
-        } {
-            input = input.advance(1);
-            let frame = (open_delimiter, trees);
-            #[cfg(span_locations)]
-            let frame = (lo, frame);
-            stack.push(frame);
-            trees = TokenStreamBuilder::new();
-        } else if let Some(close_delimiter) = match first {
-            b')' => Some(Delimiter::Parenthesis),
-            b']' => Some(Delimiter::Bracket),
-            b'}' => Some(Delimiter::Brace),
-            _ => None,
-        } {
-            let frame = match stack.pop() {
-                Some(frame) => frame,
-                None => return Err(lex_error(input)),
-            };
-            #[cfg(span_locations)]
-            let (lo, frame) = frame;
-            let (open_delimiter, outer) = frame;
-            if open_delimiter != close_delimiter {
-                return Err(lex_error(input));
-            }
-            input = input.advance(1);
-            let mut g = Group::new(open_delimiter, trees.build());
-            g.set_span(Span {
-                #[cfg(span_locations)]
-                lo,
-                #[cfg(span_locations)]
-                hi: input.off,
-            });
-            trees = outer;
-            trees.push_token_from_parser(TokenTree::Group(crate::Group::_new_fallback(g)));
-        } else {
-            let (rest, mut tt) = match leaf_token(input) {
-                Ok((rest, tt)) => (rest, tt),
-                Err(Reject) => return Err(lex_error(input)),
-            };
-            tt.set_span(crate::Span::_new_fallback(Span {
-                #[cfg(span_locations)]
-                lo,
-                #[cfg(span_locations)]
-                hi: rest.off,
-            }));
-            trees.push_token_from_parser(tt);
-            input = rest;
-        }
-    }
-}
-
-fn lex_error(cursor: Cursor) -> LexError {
-    #[cfg(not(span_locations))]
-    let _ = cursor;
-    LexError {
-        span: Span {
-            #[cfg(span_locations)]
-            lo: cursor.off,
-            #[cfg(span_locations)]
-            hi: cursor.off,
-        },
-    }
-}
-
-fn leaf_token(input: Cursor) -> PResult<TokenTree> {
-    if let Ok((input, l)) = literal(input) {
-        // must be parsed before ident
-        Ok((input, TokenTree::Literal(crate::Literal::_new_fallback(l))))
-    } else if let Ok((input, p)) = punct(input) {
-        Ok((input, TokenTree::Punct(p)))
-    } else if let Ok((input, i)) = ident(input) {
-        Ok((input, TokenTree::Ident(i)))
-    } else if input.starts_with(ERROR) {
-        let rest = input.advance(ERROR.len());
-        let repr = crate::Literal::_new_fallback(Literal::_new(ERROR.to_owned()));
-        Ok((rest, TokenTree::Literal(repr)))
-    } else {
-        Err(Reject)
-    }
-}
-
-fn ident(input: Cursor) -> PResult<crate::Ident> {
-    if [
-        "r\"", "r#\"", "r##", "b\"", "b\'", "br\"", "br#", "c\"", "cr\"", "cr#",
-    ]
-    .iter()
-    .any(|prefix| input.starts_with(prefix))
-    {
-        Err(Reject)
-    } else {
-        ident_any(input)
-    }
-}
-
-fn ident_any(input: Cursor) -> PResult<crate::Ident> {
-    let raw = input.starts_with("r#");
-    let rest = input.advance((raw as usize) << 1);
-
-    let (rest, sym) = ident_not_raw(rest)?;
-
-    if !raw {
-        let ident = crate::Ident::_new(crate::imp::Ident::new_unchecked(
-            sym,
-            fallback::Span::call_site(),
-        ));
-        return Ok((rest, ident));
-    }
-
-    match sym {
-        "_" | "super" | "self" | "Self" | "crate" => return Err(Reject),
-        _ => {}
-    }
-
-    let ident = crate::Ident::_new(crate::imp::Ident::new_raw_unchecked(
-        sym,
-        fallback::Span::call_site(),
-    ));
-    Ok((rest, ident))
-}
-
-fn ident_not_raw(input: Cursor) -> PResult<&str> {
-    let mut chars = input.char_indices();
-
-    match chars.next() {
-        Some((_, ch)) if is_ident_start(ch) => {}
-        _ => return Err(Reject),
-    }
-
-    let mut end = input.len();
-    for (i, ch) in chars {
-        if !is_ident_continue(ch) {
-            end = i;
-            break;
-        }
-    }
-
-    Ok((input.advance(end), &input.rest[..end]))
-}
-
-pub(crate) fn literal(input: Cursor) -> PResult<Literal> {
-    let rest = literal_nocapture(input)?;
-    let end = input.len() - rest.len();
-    Ok((rest, Literal::_new(input.rest[..end].to_string())))
-}
-
-fn literal_nocapture(input: Cursor) -> Result<Cursor, Reject> {
-    if let Ok(ok) = string(input) {
-        Ok(ok)
-    } else if let Ok(ok) = byte_string(input) {
-        Ok(ok)
-    } else if let Ok(ok) = c_string(input) {
-        Ok(ok)
-    } else if let Ok(ok) = byte(input) {
-        Ok(ok)
-    } else if let Ok(ok) = character(input) {
-        Ok(ok)
-    } else if let Ok(ok) = float(input) {
-        Ok(ok)
-    } else if let Ok(ok) = int(input) {
-        Ok(ok)
-    } else {
-        Err(Reject)
-    }
-}
-
-fn literal_suffix(input: Cursor) -> Cursor {
-    match ident_not_raw(input) {
-        Ok((input, _)) => input,
-        Err(Reject) => input,
-    }
-}
-
-fn string(input: Cursor) -> Result<Cursor, Reject> {
-    if let Ok(input) = input.parse("\"") {
-        cooked_string(input)
-    } else if let Ok(input) = input.parse("r") {
-        raw_string(input)
-    } else {
-        Err(Reject)
-    }
-}
-
-fn cooked_string(mut input: Cursor) -> Result<Cursor, Reject> {
-    let mut chars = input.char_indices();
-
-    while let Some((i, ch)) = chars.next() {
-        match ch {
-            '"' => {
-                let input = input.advance(i + 1);
-                return Ok(literal_suffix(input));
-            }
-            '\r' => match chars.next() {
-                Some((_, '\n')) => {}
-                _ => break,
-            },
-            '\\' => match chars.next() {
-                Some((_, 'x')) => {
-                    backslash_x_char(&mut chars)?;
-                }
-                Some((_, 'n' | 'r' | 't' | '\\' | '\'' | '"' | '0')) => {}
-                Some((_, 'u')) => {
-                    backslash_u(&mut chars)?;
-                }
-                Some((newline, ch @ ('\n' | '\r'))) => {
-                    input = input.advance(newline + 1);
-                    trailing_backslash(&mut input, ch as u8)?;
-                    chars = input.char_indices();
-                }
-                _ => break,
-            },
-            _ch => {}
-        }
-    }
-    Err(Reject)
-}
-
-fn raw_string(input: Cursor) -> Result<Cursor, Reject> {
-    let (input, delimiter) = delimiter_of_raw_string(input)?;
-    let mut bytes = input.bytes().enumerate();
-    while let Some((i, byte)) = bytes.next() {
-        match byte {
-            b'"' if input.rest[i + 1..].starts_with(delimiter) => {
-                let rest = input.advance(i + 1 + delimiter.len());
-                return Ok(literal_suffix(rest));
-            }
-            b'\r' => match bytes.next() {
-                Some((_, b'\n')) => {}
-                _ => break,
-            },
-            _ => {}
-        }
-    }
-    Err(Reject)
-}
-
-fn byte_string(input: Cursor) -> Result<Cursor, Reject> {
-    if let Ok(input) = input.parse("b\"") {
-        cooked_byte_string(input)
-    } else if let Ok(input) = input.parse("br") {
-        raw_byte_string(input)
-    } else {
-        Err(Reject)
-    }
-}
-
-fn cooked_byte_string(mut input: Cursor) -> Result<Cursor, Reject> {
-    let mut bytes = input.bytes().enumerate();
-    while let Some((offset, b)) = bytes.next() {
-        match b {
-            b'"' => {
-                let input = input.advance(offset + 1);
-                return Ok(literal_suffix(input));
-            }
-            b'\r' => match bytes.next() {
-                Some((_, b'\n')) => {}
-                _ => break,
-            },
-            b'\\' => match bytes.next() {
-                Some((_, b'x')) => {
-                    backslash_x_byte(&mut bytes)?;
-                }
-                Some((_, b'n' | b'r' | b't' | b'\\' | b'0' | b'\'' | b'"')) => {}
-                Some((newline, b @ (b'\n' | b'\r'))) => {
-                    input = input.advance(newline + 1);
-                    trailing_backslash(&mut input, b)?;
-                    bytes = input.bytes().enumerate();
-                }
-                _ => break,
-            },
-            b if b.is_ascii() => {}
-            _ => break,
-        }
-    }
-    Err(Reject)
-}
-
-fn delimiter_of_raw_string(input: Cursor) -> PResult<&str> {
-    for (i, byte) in input.bytes().enumerate() {
-        match byte {
-            b'"' => {
-                if i > 255 {
-                    // https://github.com/rust-lang/rust/pull/95251
-                    return Err(Reject);
-                }
-                return Ok((input.advance(i + 1), &input.rest[..i]));
-            }
-            b'#' => {}
-            _ => break,
-        }
-    }
-    Err(Reject)
-}
-
-fn raw_byte_string(input: Cursor) -> Result<Cursor, Reject> {
-    let (input, delimiter) = delimiter_of_raw_string(input)?;
-    let mut bytes = input.bytes().enumerate();
-    while let Some((i, byte)) = bytes.next() {
-        match byte {
-            b'"' if input.rest[i + 1..].starts_with(delimiter) => {
-                let rest = input.advance(i + 1 + delimiter.len());
-                return Ok(literal_suffix(rest));
-            }
-            b'\r' => match bytes.next() {
-                Some((_, b'\n')) => {}
-                _ => break,
-            },
-            other => {
-                if !other.is_ascii() {
-                    break;
-                }
-            }
-        }
-    }
-    Err(Reject)
-}
-
-fn c_string(input: Cursor) -> Result<Cursor, Reject> {
-    if let Ok(input) = input.parse("c\"") {
-        cooked_c_string(input)
-    } else if let Ok(input) = input.parse("cr") {
-        raw_c_string(input)
-    } else {
-        Err(Reject)
-    }
-}
-
-fn raw_c_string(input: Cursor) -> Result<Cursor, Reject> {
-    let (input, delimiter) = delimiter_of_raw_string(input)?;
-    let mut bytes = input.bytes().enumerate();
-    while let Some((i, byte)) = bytes.next() {
-        match byte {
-            b'"' if input.rest[i + 1..].starts_with(delimiter) => {
-                let rest = input.advance(i + 1 + delimiter.len());
-                return Ok(literal_suffix(rest));
-            }
-            b'\r' => match bytes.next() {
-                Some((_, b'\n')) => {}
-                _ => break,
-            },
-            b'\0' => break,
-            _ => {}
-        }
-    }
-    Err(Reject)
-}
-
-fn cooked_c_string(mut input: Cursor) -> Result<Cursor, Reject> {
-    let mut chars = input.char_indices();
-
-    while let Some((i, ch)) = chars.next() {
-        match ch {
-            '"' => {
-                let input = input.advance(i + 1);
-                return Ok(literal_suffix(input));
-            }
-            '\r' => match chars.next() {
-                Some((_, '\n')) => {}
-                _ => break,
-            },
-            '\\' => match chars.next() {
-                Some((_, 'x')) => {
-                    backslash_x_nonzero(&mut chars)?;
-                }
-                Some((_, 'n' | 'r' | 't' | '\\' | '\'' | '"')) => {}
-                Some((_, 'u')) => {
-                    if backslash_u(&mut chars)? == '\0' {
-                        break;
-                    }
-                }
-                Some((newline, ch @ ('\n' | '\r'))) => {
-                    input = input.advance(newline + 1);
-                    trailing_backslash(&mut input, ch as u8)?;
-                    chars = input.char_indices();
-                }
-                _ => break,
-            },
-            '\0' => break,
-            _ch => {}
-        }
-    }
-    Err(Reject)
-}
-
-fn byte(input: Cursor) -> Result<Cursor, Reject> {
-    let input = input.parse("b'")?;
-    let mut bytes = input.bytes().enumerate();
-    let ok = match bytes.next().map(|(_, b)| b) {
-        Some(b'\\') => match bytes.next().map(|(_, b)| b) {
-            Some(b'x') => backslash_x_byte(&mut bytes).is_ok(),
-            Some(b'n' | b'r' | b't' | b'\\' | b'0' | b'\'' | b'"') => true,
-            _ => false,
-        },
-        b => b.is_some(),
-    };
-    if !ok {
-        return Err(Reject);
-    }
-    let (offset, _) = bytes.next().ok_or(Reject)?;
-    if !input.chars().as_str().is_char_boundary(offset) {
-        return Err(Reject);
-    }
-    let input = input.advance(offset).parse("'")?;
-    Ok(literal_suffix(input))
-}
-
-fn character(input: Cursor) -> Result<Cursor, Reject> {
-    let input = input.parse("'")?;
-    let mut chars = input.char_indices();
-    let ok = match chars.next().map(|(_, ch)| ch) {
-        Some('\\') => match chars.next().map(|(_, ch)| ch) {
-            Some('x') => backslash_x_char(&mut chars).is_ok(),
-            Some('u') => backslash_u(&mut chars).is_ok(),
-            Some('n' | 'r' | 't' | '\\' | '0' | '\'' | '"') => true,
-            _ => false,
-        },
-        ch => ch.is_some(),
-    };
-    if !ok {
-        return Err(Reject);
-    }
-    let (idx, _) = chars.next().ok_or(Reject)?;
-    let input = input.advance(idx).parse("'")?;
-    Ok(literal_suffix(input))
-}
-
-macro_rules! next_ch {
-    ($chars:ident @ $pat:pat) => {
-        match $chars.next() {
-            Some((_, ch)) => match ch {
-                $pat => ch,
-                _ => return Err(Reject),
-            },
-            None => return Err(Reject),
-        }
-    };
-}
-
-fn backslash_x_char<I>(chars: &mut I) -> Result<(), Reject>
-where
-    I: Iterator<Item = (usize, char)>,
-{
-    next_ch!(chars @ '0'..='7');
-    next_ch!(chars @ '0'..='9' | 'a'..='f' | 'A'..='F');
-    Ok(())
-}
-
-fn backslash_x_byte<I>(chars: &mut I) -> Result<(), Reject>
-where
-    I: Iterator<Item = (usize, u8)>,
-{
-    next_ch!(chars @ b'0'..=b'9' | b'a'..=b'f' | b'A'..=b'F');
-    next_ch!(chars @ b'0'..=b'9' | b'a'..=b'f' | b'A'..=b'F');
-    Ok(())
-}
-
-fn backslash_x_nonzero<I>(chars: &mut I) -> Result<(), Reject>
-where
-    I: Iterator<Item = (usize, char)>,
-{
-    let first = next_ch!(chars @ '0'..='9' | 'a'..='f' | 'A'..='F');
-    let second = next_ch!(chars @ '0'..='9' | 'a'..='f' | 'A'..='F');
-    if first == '0' && second == '0' {
-        Err(Reject)
-    } else {
-        Ok(())
-    }
-}
-
-fn backslash_u<I>(chars: &mut I) -> Result<char, Reject>
-where
-    I: Iterator<Item = (usize, char)>,
-{
-    next_ch!(chars @ '{');
-    let mut value = 0;
-    let mut len = 0;
-    for (_, ch) in chars {
-        let digit = match ch {
-            '0'..='9' => ch as u8 - b'0',
-            'a'..='f' => 10 + ch as u8 - b'a',
-            'A'..='F' => 10 + ch as u8 - b'A',
-            '_' if len > 0 => continue,
-            '}' if len > 0 => return char::from_u32(value).ok_or(Reject),
-            _ => break,
-        };
-        if len == 6 {
-            break;
-        }
-        value *= 0x10;
-        value += u32::from(digit);
-        len += 1;
-    }
-    Err(Reject)
-}
-
-fn trailing_backslash(input: &mut Cursor, mut last: u8) -> Result<(), Reject> {
-    let mut whitespace = input.bytes().enumerate();
-    loop {
-        if last == b'\r' && whitespace.next().map_or(true, |(_, b)| b != b'\n') {
-            return Err(Reject);
-        }
-        match whitespace.next() {
-            Some((_, b @ (b' ' | b'\t' | b'\n' | b'\r'))) => {
-                last = b;
-            }
-            Some((offset, _)) => {
-                *input = input.advance(offset);
-                return Ok(());
-            }
-            None => return Err(Reject),
-        }
-    }
-}
-
-fn float(input: Cursor) -> Result<Cursor, Reject> {
-    let mut rest = float_digits(input)?;
-    if let Some(ch) = rest.chars().next() {
-        if is_ident_start(ch) {
-            rest = ident_not_raw(rest)?.0;
-        }
-    }
-    word_break(rest)
-}
-
-fn float_digits(input: Cursor) -> Result<Cursor, Reject> {
-    let mut chars = input.chars().peekable();
-    match chars.next() {
-        Some(ch) if '0' <= ch && ch <= '9' => {}
-        _ => return Err(Reject),
-    }
-
-    let mut len = 1;
-    let mut has_dot = false;
-    let mut has_exp = false;
-    while let Some(&ch) = chars.peek() {
-        match ch {
-            '0'..='9' | '_' => {
-                chars.next();
-                len += 1;
-            }
-            '.' => {
-                if has_dot {
-                    break;
-                }
-                chars.next();
-                if chars
-                    .peek()
-                    .map_or(false, |&ch| ch == '.' || is_ident_start(ch))
-                {
-                    return Err(Reject);
-                }
-                len += 1;
-                has_dot = true;
-            }
-            'e' | 'E' => {
-                chars.next();
-                len += 1;
-                has_exp = true;
-                break;
-            }
-            _ => break,
-        }
-    }
-
-    if !(has_dot || has_exp) {
-        return Err(Reject);
-    }
-
-    if has_exp {
-        let token_before_exp = if has_dot {
-            Ok(input.advance(len - 1))
-        } else {
-            Err(Reject)
-        };
-        let mut has_sign = false;
-        let mut has_exp_value = false;
-        while let Some(&ch) = chars.peek() {
-            match ch {
-                '+' | '-' => {
-                    if has_exp_value {
-                        break;
-                    }
-                    if has_sign {
-                        return token_before_exp;
-                    }
-                    chars.next();
-                    len += 1;
-                    has_sign = true;
-                }
-                '0'..='9' => {
-                    chars.next();
-                    len += 1;
-                    has_exp_value = true;
-                }
-                '_' => {
-                    chars.next();
-                    len += 1;
-                }
-                _ => break,
-            }
-        }
-        if !has_exp_value {
-            return token_before_exp;
-        }
-    }
-
-    Ok(input.advance(len))
-}
-
-fn int(input: Cursor) -> Result<Cursor, Reject> {
-    let mut rest = digits(input)?;
-    if let Some(ch) = rest.chars().next() {
-        if is_ident_start(ch) {
-            rest = ident_not_raw(rest)?.0;
-        }
-    }
-    word_break(rest)
-}
-
-fn digits(mut input: Cursor) -> Result<Cursor, Reject> {
-    let base = if input.starts_with("0x") {
-        input = input.advance(2);
-        16
-    } else if input.starts_with("0o") {
-        input = input.advance(2);
-        8
-    } else if input.starts_with("0b") {
-        input = input.advance(2);
-        2
-    } else {
-        10
-    };
-
-    let mut len = 0;
-    let mut empty = true;
-    for b in input.bytes() {
-        match b {
-            b'0'..=b'9' => {
-                let digit = (b - b'0') as u64;
-                if digit >= base {
-                    return Err(Reject);
-                }
-            }
-            b'a'..=b'f' => {
-                let digit = 10 + (b - b'a') as u64;
-                if digit >= base {
-                    break;
-                }
-            }
-            b'A'..=b'F' => {
-                let digit = 10 + (b - b'A') as u64;
-                if digit >= base {
-                    break;
-                }
-            }
-            b'_' => {
-                if empty && base == 10 {
-                    return Err(Reject);
-                }
-                len += 1;
-                continue;
-            }
-            _ => break,
-        };
-        len += 1;
-        empty = false;
-    }
-    if empty {
-        Err(Reject)
-    } else {
-        Ok(input.advance(len))
-    }
-}
-
-fn punct(input: Cursor) -> PResult<Punct> {
-    let (rest, ch) = punct_char(input)?;
-    if ch == '\'' {
-        if ident_any(rest)?.0.starts_with_char('\'') {
-            Err(Reject)
-        } else {
-            Ok((rest, Punct::new('\'', Spacing::Joint)))
-        }
-    } else {
-        let kind = match punct_char(rest) {
-            Ok(_) => Spacing::Joint,
-            Err(Reject) => Spacing::Alone,
-        };
-        Ok((rest, Punct::new(ch, kind)))
-    }
-}
-
-fn punct_char(input: Cursor) -> PResult<char> {
-    if input.starts_with("//") || input.starts_with("/*") {
-        // Do not accept `/` of a comment as a punct.
-        return Err(Reject);
-    }
-
-    let mut chars = input.chars();
-    let first = match chars.next() {
-        Some(ch) => ch,
-        None => {
-            return Err(Reject);
-        }
-    };
-    let recognized = "~!@#$%^&*-=+|;:,<.>/?'";
-    if recognized.contains(first) {
-        Ok((input.advance(first.len_utf8()), first))
-    } else {
-        Err(Reject)
-    }
-}
-
-fn doc_comment<'a>(input: Cursor<'a>, trees: &mut TokenStreamBuilder) -> PResult<'a, ()> {
-    #[cfg(span_locations)]
-    let lo = input.off;
-    let (rest, (comment, inner)) = doc_comment_contents(input)?;
-    let fallback_span = Span {
-        #[cfg(span_locations)]
-        lo,
-        #[cfg(span_locations)]
-        hi: rest.off,
-    };
-    let span = crate::Span::_new_fallback(fallback_span);
-
-    let mut scan_for_bare_cr = comment;
-    while let Some(cr) = scan_for_bare_cr.find('\r') {
-        let rest = &scan_for_bare_cr[cr + 1..];
-        if !rest.starts_with('\n') {
-            return Err(Reject);
-        }
-        scan_for_bare_cr = rest;
-    }
-
-    let mut pound = Punct::new('#', Spacing::Alone);
-    pound.set_span(span);
-    trees.push_token_from_parser(TokenTree::Punct(pound));
-
-    if inner {
-        let mut bang = Punct::new('!', Spacing::Alone);
-        bang.set_span(span);
-        trees.push_token_from_parser(TokenTree::Punct(bang));
-    }
-
-    let doc_ident = crate::Ident::_new(crate::imp::Ident::new_unchecked("doc", fallback_span));
-    let mut equal = Punct::new('=', Spacing::Alone);
-    equal.set_span(span);
-    let mut literal = crate::Literal::string(comment);
-    literal.set_span(span);
-    let mut bracketed = TokenStreamBuilder::with_capacity(3);
-    bracketed.push_token_from_parser(TokenTree::Ident(doc_ident));
-    bracketed.push_token_from_parser(TokenTree::Punct(equal));
-    bracketed.push_token_from_parser(TokenTree::Literal(literal));
-    let group = Group::new(Delimiter::Bracket, bracketed.build());
-    let mut group = crate::Group::_new_fallback(group);
-    group.set_span(span);
-    trees.push_token_from_parser(TokenTree::Group(group));
-
-    Ok((rest, ()))
-}
-
-fn doc_comment_contents(input: Cursor) -> PResult<(&str, bool)> {
-    if input.starts_with("//!") {
-        let input = input.advance(3);
-        let (input, s) = take_until_newline_or_eof(input);
-        Ok((input, (s, true)))
-    } else if input.starts_with("/*!") {
-        let (input, s) = block_comment(input)?;
-        Ok((input, (&s[3..s.len() - 2], true)))
-    } else if input.starts_with("///") {
-        let input = input.advance(3);
-        if input.starts_with_char('/') {
-            return Err(Reject);
-        }
-        let (input, s) = take_until_newline_or_eof(input);
-        Ok((input, (s, false)))
-    } else if input.starts_with("/**") && !input.rest[3..].starts_with('*') {
-        let (input, s) = block_comment(input)?;
-        Ok((input, (&s[3..s.len() - 2], false)))
-    } else {
-        Err(Reject)
-    }
-}
-
-fn take_until_newline_or_eof(input: Cursor) -> (Cursor, &str) {
-    let chars = input.char_indices();
-
-    for (i, ch) in chars {
-        if ch == '\n' {
-            return (input.advance(i), &input.rest[..i]);
-        } else if ch == '\r' && input.rest[i + 1..].starts_with('\n') {
-            return (input.advance(i + 1), &input.rest[..i]);
-        }
-    }
-
-    (input.advance(input.len()), input.rest)
-}