rust/crates/mbe/src/syntax_bridge.rs

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//! FIXME: write short doc here
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use parser::{FragmentKind, ParseError, TreeSink};
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use rustc_hash::FxHashMap;
use syntax::{
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ast::{self, make::tokens::doc_comment},
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tokenize, AstToken, Parse, SmolStr, SyntaxKind,
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SyntaxKind::*,
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SyntaxNode, SyntaxToken, SyntaxTreeBuilder, TextRange, TextSize, Token as RawToken, T,
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};
use tt::buffer::{Cursor, TokenBuffer};
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use crate::subtree_source::SubtreeTokenSource;
use crate::ExpandError;
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#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum TokenTextRange {
Token(TextRange),
Delimiter(TextRange, TextRange),
}
impl TokenTextRange {
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pub fn by_kind(self, kind: SyntaxKind) -> Option<TextRange> {
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match self {
TokenTextRange::Token(it) => Some(it),
TokenTextRange::Delimiter(open, close) => match kind {
T!['{'] | T!['('] | T!['['] => Some(open),
T!['}'] | T![')'] | T![']'] => Some(close),
_ => None,
},
}
}
}
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/// Maps `tt::TokenId` to the relative range of the original token.
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#[derive(Debug, PartialEq, Eq, Clone, Default)]
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pub struct TokenMap {
/// Maps `tt::TokenId` to the *relative* source range.
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entries: Vec<(tt::TokenId, TokenTextRange)>,
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}
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/// Convert the syntax tree (what user has written) to a `TokenTree` (what macro
/// will consume).
pub fn ast_to_token_tree(ast: &impl ast::AstNode) -> Option<(tt::Subtree, TokenMap)> {
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syntax_node_to_token_tree(ast.syntax())
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}
/// Convert the syntax node to a `TokenTree` (what macro
/// will consume).
pub fn syntax_node_to_token_tree(node: &SyntaxNode) -> Option<(tt::Subtree, TokenMap)> {
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let global_offset = node.text_range().start();
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let mut c = Convertor::new(node, global_offset);
let subtree = c.go()?;
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Some((subtree, c.id_alloc.map))
}
// The following items are what `rustc` macro can be parsed into :
// link: https://github.com/rust-lang/rust/blob/9ebf47851a357faa4cd97f4b1dc7835f6376e639/src/libsyntax/ext/expand.rs#L141
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// * Expr(P<ast::Expr>) -> token_tree_to_expr
// * Pat(P<ast::Pat>) -> token_tree_to_pat
// * Ty(P<ast::Ty>) -> token_tree_to_ty
// * Stmts(SmallVec<[ast::Stmt; 1]>) -> token_tree_to_stmts
// * Items(SmallVec<[P<ast::Item>; 1]>) -> token_tree_to_items
//
// * TraitItems(SmallVec<[ast::TraitItem; 1]>)
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// * AssocItems(SmallVec<[ast::AssocItem; 1]>)
// * ForeignItems(SmallVec<[ast::ForeignItem; 1]>
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pub fn token_tree_to_syntax_node(
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tt: &tt::Subtree,
fragment_kind: FragmentKind,
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) -> Result<(Parse<SyntaxNode>, TokenMap), ExpandError> {
let tmp;
let tokens = match tt {
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tt::Subtree { delimiter: None, token_trees } => token_trees.as_slice(),
_ => {
tmp = [tt.clone().into()];
&tmp[..]
}
};
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let buffer = TokenBuffer::new(&tokens);
let mut token_source = SubtreeTokenSource::new(&buffer);
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let mut tree_sink = TtTreeSink::new(buffer.begin());
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parser::parse_fragment(&mut token_source, &mut tree_sink, fragment_kind);
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if tree_sink.roots.len() != 1 {
return Err(ExpandError::ConversionError);
}
//FIXME: would be cool to report errors
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let (parse, range_map) = tree_sink.finish();
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Ok((parse, range_map))
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}
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/// Convert a string to a `TokenTree`
pub fn parse_to_token_tree(text: &str) -> Option<(tt::Subtree, TokenMap)> {
let (tokens, errors) = tokenize(text);
if !errors.is_empty() {
return None;
}
let mut conv = RawConvertor {
text,
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offset: TextSize::default(),
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inner: tokens.iter(),
id_alloc: TokenIdAlloc {
map: Default::default(),
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global_offset: TextSize::default(),
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next_id: 0,
},
};
let subtree = conv.go()?;
Some((subtree, conv.id_alloc.map))
}
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impl TokenMap {
pub fn token_by_range(&self, relative_range: TextRange) -> Option<tt::TokenId> {
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let &(token_id, _) = self.entries.iter().find(|(_, range)| match range {
TokenTextRange::Token(it) => *it == relative_range,
TokenTextRange::Delimiter(open, close) => {
*open == relative_range || *close == relative_range
}
})?;
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Some(token_id)
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}
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pub fn range_by_token(&self, token_id: tt::TokenId) -> Option<TokenTextRange> {
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let &(_, range) = self.entries.iter().find(|(tid, _)| *tid == token_id)?;
Some(range)
}
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fn insert(&mut self, token_id: tt::TokenId, relative_range: TextRange) {
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self.entries.push((token_id, TokenTextRange::Token(relative_range)));
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}
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fn insert_delim(
&mut self,
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token_id: tt::TokenId,
open_relative_range: TextRange,
close_relative_range: TextRange,
) -> usize {
let res = self.entries.len();
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self.entries
.push((token_id, TokenTextRange::Delimiter(open_relative_range, close_relative_range)));
res
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}
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fn update_close_delim(&mut self, idx: usize, close_relative_range: TextRange) {
let (_, token_text_range) = &mut self.entries[idx];
if let TokenTextRange::Delimiter(dim, _) = token_text_range {
*token_text_range = TokenTextRange::Delimiter(*dim, close_relative_range);
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}
}
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fn remove_delim(&mut self, idx: usize) {
// FIXME: This could be accidently quadratic
self.entries.remove(idx);
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}
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}
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/// Returns the textual content of a doc comment block as a quoted string
/// That is, strips leading `///` (or `/**`, etc)
/// and strips the ending `*/`
/// And then quote the string, which is needed to convert to `tt::Literal`
fn doc_comment_text(comment: &ast::Comment) -> SmolStr {
let prefix_len = comment.prefix().len();
let mut text = &comment.text()[prefix_len..];
// Remove ending "*/"
if comment.kind().shape == ast::CommentShape::Block {
text = &text[0..text.len() - 2];
}
// Quote the string
// Note that `tt::Literal` expect an escaped string
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let text = format!("{:?}", text.escape_default().to_string());
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text.into()
}
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fn convert_doc_comment(token: &syntax::SyntaxToken) -> Option<Vec<tt::TokenTree>> {
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let comment = ast::Comment::cast(token.clone())?;
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let doc = comment.kind().doc?;
// Make `doc="\" Comments\""
let mut meta_tkns = Vec::new();
meta_tkns.push(mk_ident("doc"));
meta_tkns.push(mk_punct('='));
meta_tkns.push(mk_doc_literal(&comment));
// Make `#![]`
let mut token_trees = Vec::new();
token_trees.push(mk_punct('#'));
if let ast::CommentPlacement::Inner = doc {
token_trees.push(mk_punct('!'));
}
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token_trees.push(tt::TokenTree::from(tt::Subtree {
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delimiter: Some(tt::Delimiter {
kind: tt::DelimiterKind::Bracket,
id: tt::TokenId::unspecified(),
}),
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token_trees: meta_tkns,
}));
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return Some(token_trees);
// Helper functions
fn mk_ident(s: &str) -> tt::TokenTree {
tt::TokenTree::from(tt::Leaf::from(tt::Ident {
text: s.into(),
id: tt::TokenId::unspecified(),
}))
}
fn mk_punct(c: char) -> tt::TokenTree {
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tt::TokenTree::from(tt::Leaf::from(tt::Punct {
char: c,
spacing: tt::Spacing::Alone,
id: tt::TokenId::unspecified(),
}))
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}
fn mk_doc_literal(comment: &ast::Comment) -> tt::TokenTree {
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let lit = tt::Literal { text: doc_comment_text(comment), id: tt::TokenId::unspecified() };
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tt::TokenTree::from(tt::Leaf::from(lit))
}
}
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struct TokenIdAlloc {
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map: TokenMap,
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global_offset: TextSize,
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next_id: u32,
}
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impl TokenIdAlloc {
fn alloc(&mut self, absolute_range: TextRange) -> tt::TokenId {
let relative_range = absolute_range - self.global_offset;
let token_id = tt::TokenId(self.next_id);
self.next_id += 1;
self.map.insert(token_id, relative_range);
token_id
}
fn open_delim(&mut self, open_abs_range: TextRange) -> (tt::TokenId, usize) {
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let token_id = tt::TokenId(self.next_id);
self.next_id += 1;
let idx = self.map.insert_delim(
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token_id,
open_abs_range - self.global_offset,
open_abs_range - self.global_offset,
);
(token_id, idx)
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}
fn close_delim(&mut self, idx: usize, close_abs_range: Option<TextRange>) {
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match close_abs_range {
None => {
self.map.remove_delim(idx);
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}
Some(close) => {
self.map.update_close_delim(idx, close - self.global_offset);
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}
}
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}
}
/// A Raw Token (straightly from lexer) convertor
struct RawConvertor<'a> {
text: &'a str,
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offset: TextSize,
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id_alloc: TokenIdAlloc,
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inner: std::slice::Iter<'a, RawToken>,
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}
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trait SrcToken: std::fmt::Debug {
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fn kind(&self) -> SyntaxKind;
fn to_char(&self) -> Option<char>;
fn to_text(&self) -> SmolStr;
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}
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trait TokenConvertor {
type Token: SrcToken;
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fn go(&mut self) -> Option<tt::Subtree> {
let mut subtree = tt::Subtree::default();
subtree.delimiter = None;
while self.peek().is_some() {
self.collect_leaf(&mut subtree.token_trees);
}
if subtree.token_trees.is_empty() {
return None;
}
if subtree.token_trees.len() == 1 {
if let tt::TokenTree::Subtree(first) = &subtree.token_trees[0] {
return Some(first.clone());
}
}
Some(subtree)
}
fn collect_leaf(&mut self, result: &mut Vec<tt::TokenTree>) {
let (token, range) = match self.bump() {
None => return,
Some(it) => it,
};
let k: SyntaxKind = token.kind();
if k == COMMENT {
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if let Some(tokens) = self.convert_doc_comment(&token) {
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result.extend(tokens);
}
return;
}
result.push(if k.is_punct() {
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assert_eq!(range.len(), TextSize::of('.'));
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let delim = match k {
T!['('] => Some((tt::DelimiterKind::Parenthesis, T![')'])),
T!['{'] => Some((tt::DelimiterKind::Brace, T!['}'])),
T!['['] => Some((tt::DelimiterKind::Bracket, T![']'])),
_ => None,
};
if let Some((kind, closed)) = delim {
let mut subtree = tt::Subtree::default();
let (id, idx) = self.id_alloc().open_delim(range);
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subtree.delimiter = Some(tt::Delimiter { kind, id });
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while self.peek().map(|it| it.kind() != closed).unwrap_or(false) {
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self.collect_leaf(&mut subtree.token_trees);
}
let last_range = match self.bump() {
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None => {
// For error resilience, we insert an char punct for the opening delim here
self.id_alloc().close_delim(idx, None);
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let leaf: tt::Leaf = tt::Punct {
id: self.id_alloc().alloc(range),
char: token.to_char().unwrap(),
spacing: tt::Spacing::Alone,
}
.into();
result.push(leaf.into());
result.extend(subtree.token_trees);
return;
}
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Some(it) => it.1,
};
self.id_alloc().close_delim(idx, Some(last_range));
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subtree.into()
} else {
let spacing = match self.peek() {
Some(next)
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if next.kind().is_trivia()
|| next.kind() == T!['[']
|| next.kind() == T!['{']
|| next.kind() == T!['('] =>
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{
tt::Spacing::Alone
}
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Some(next) if next.kind().is_punct() => tt::Spacing::Joint,
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_ => tt::Spacing::Alone,
};
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let char = match token.to_char() {
Some(c) => c,
None => {
panic!("Token from lexer must be single char: token = {:#?}", token);
}
};
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tt::Leaf::from(tt::Punct { char, spacing, id: self.id_alloc().alloc(range) }).into()
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}
} else {
macro_rules! make_leaf {
($i:ident) => {
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tt::$i { id: self.id_alloc().alloc(range), text: token.to_text() }.into()
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};
}
let leaf: tt::Leaf = match k {
T![true] | T![false] => make_leaf!(Ident),
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IDENT => make_leaf!(Ident),
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k if k.is_keyword() => make_leaf!(Ident),
k if k.is_literal() => make_leaf!(Literal),
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LIFETIME => {
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let char_unit = TextSize::of('\'');
let r = TextRange::at(range.start(), char_unit);
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let apostrophe = tt::Leaf::from(tt::Punct {
char: '\'',
spacing: tt::Spacing::Joint,
id: self.id_alloc().alloc(r),
});
result.push(apostrophe.into());
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let r = TextRange::at(range.start() + char_unit, range.len() - char_unit);
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let ident = tt::Leaf::from(tt::Ident {
text: SmolStr::new(&token.to_text()[1..]),
id: self.id_alloc().alloc(r),
});
result.push(ident.into());
return;
}
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_ => return,
};
leaf.into()
});
}
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fn convert_doc_comment(&self, token: &Self::Token) -> Option<Vec<tt::TokenTree>>;
fn bump(&mut self) -> Option<(Self::Token, TextRange)>;
fn peek(&self) -> Option<Self::Token>;
fn id_alloc(&mut self) -> &mut TokenIdAlloc;
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}
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impl<'a> SrcToken for (RawToken, &'a str) {
fn kind(&self) -> SyntaxKind {
self.0.kind
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}
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fn to_char(&self) -> Option<char> {
self.1.chars().next()
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}
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fn to_text(&self) -> SmolStr {
self.1.into()
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}
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}
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impl RawConvertor<'_> {}
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impl<'a> TokenConvertor for RawConvertor<'a> {
type Token = (RawToken, &'a str);
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fn convert_doc_comment(&self, token: &Self::Token) -> Option<Vec<tt::TokenTree>> {
convert_doc_comment(&doc_comment(token.1))
}
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fn bump(&mut self) -> Option<(Self::Token, TextRange)> {
let token = self.inner.next()?;
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let range = TextRange::at(self.offset, token.len);
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self.offset += token.len;
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Some(((*token, &self.text[range]), range))
}
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fn peek(&self) -> Option<Self::Token> {
let token = self.inner.as_slice().get(0).cloned();
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token.map(|it| {
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let range = TextRange::at(self.offset, it.len);
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(it, &self.text[range])
})
}
fn id_alloc(&mut self) -> &mut TokenIdAlloc {
&mut self.id_alloc
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}
}
struct Convertor {
id_alloc: TokenIdAlloc,
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current: Option<SyntaxToken>,
range: TextRange,
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punct_offset: Option<(SyntaxToken, TextSize)>,
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}
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impl Convertor {
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fn new(node: &SyntaxNode, global_offset: TextSize) -> Convertor {
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Convertor {
id_alloc: { TokenIdAlloc { map: TokenMap::default(), global_offset, next_id: 0 } },
current: node.first_token(),
range: node.text_range(),
punct_offset: None,
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}
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}
}
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#[derive(Debug)]
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enum SynToken {
Ordiniary(SyntaxToken),
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Punch(SyntaxToken, TextSize),
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}
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impl SynToken {
fn token(&self) -> &SyntaxToken {
match self {
SynToken::Ordiniary(it) => it,
SynToken::Punch(it, _) => it,
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}
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}
}
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impl SrcToken for SynToken {
fn kind(&self) -> SyntaxKind {
self.token().kind()
}
fn to_char(&self) -> Option<char> {
match self {
SynToken::Ordiniary(_) => None,
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SynToken::Punch(it, i) => it.text().chars().nth((*i).into()),
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}
}
fn to_text(&self) -> SmolStr {
self.token().text().clone()
}
}
impl TokenConvertor for Convertor {
type Token = SynToken;
fn convert_doc_comment(&self, token: &Self::Token) -> Option<Vec<tt::TokenTree>> {
convert_doc_comment(token.token())
}
fn bump(&mut self) -> Option<(Self::Token, TextRange)> {
if let Some((punct, offset)) = self.punct_offset.clone() {
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if usize::from(offset) + 1 < punct.text().len() {
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let offset = offset + TextSize::of('.');
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let range = punct.text_range();
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self.punct_offset = Some((punct.clone(), offset));
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let range = TextRange::at(range.start() + offset, TextSize::of('.'));
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return Some((SynToken::Punch(punct, offset), range));
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}
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}
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let curr = self.current.clone()?;
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if !&self.range.contains_range(curr.text_range()) {
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return None;
}
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self.current = curr.next_token();
let token = if curr.kind().is_punct() {
let range = curr.text_range();
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let range = TextRange::at(range.start(), TextSize::of('.'));
self.punct_offset = Some((curr.clone(), 0.into()));
(SynToken::Punch(curr, 0.into()), range)
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} else {
self.punct_offset = None;
let range = curr.text_range();
(SynToken::Ordiniary(curr), range)
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};
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Some(token)
}
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fn peek(&self) -> Option<Self::Token> {
if let Some((punct, mut offset)) = self.punct_offset.clone() {
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offset = offset + TextSize::of('.');
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if usize::from(offset) < punct.text().len() {
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return Some(SynToken::Punch(punct, offset));
}
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}
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let curr = self.current.clone()?;
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if !self.range.contains_range(curr.text_range()) {
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return None;
}
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let token = if curr.kind().is_punct() {
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SynToken::Punch(curr, 0.into())
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} else {
SynToken::Ordiniary(curr)
};
Some(token)
}
fn id_alloc(&mut self) -> &mut TokenIdAlloc {
&mut self.id_alloc
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}
}
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struct TtTreeSink<'a> {
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buf: String,
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cursor: Cursor<'a>,
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open_delims: FxHashMap<tt::TokenId, TextSize>,
text_pos: TextSize,
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inner: SyntaxTreeBuilder,
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token_map: TokenMap,
// Number of roots
// Use for detect ill-form tree which is not single root
roots: smallvec::SmallVec<[usize; 1]>,
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}
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impl<'a> TtTreeSink<'a> {
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fn new(cursor: Cursor<'a>) -> Self {
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TtTreeSink {
buf: String::new(),
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cursor,
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open_delims: FxHashMap::default(),
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text_pos: 0.into(),
inner: SyntaxTreeBuilder::default(),
roots: smallvec::SmallVec::new(),
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token_map: TokenMap::default(),
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}
}
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fn finish(self) -> (Parse<SyntaxNode>, TokenMap) {
(self.inner.finish(), self.token_map)
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}
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}
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fn delim_to_str(d: Option<tt::DelimiterKind>, closing: bool) -> SmolStr {
let texts = match d {
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Some(tt::DelimiterKind::Parenthesis) => "()",
Some(tt::DelimiterKind::Brace) => "{}",
Some(tt::DelimiterKind::Bracket) => "[]",
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None => return "".into(),
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};
let idx = closing as usize;
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let text = &texts[idx..texts.len() - (1 - idx)];
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text.into()
}
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impl<'a> TreeSink for TtTreeSink<'a> {
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fn token(&mut self, kind: SyntaxKind, mut n_tokens: u8) {
if kind == L_DOLLAR || kind == R_DOLLAR {
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self.cursor = self.cursor.bump_subtree();
return;
}
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if kind == LIFETIME {
n_tokens = 2;
}
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let mut last = self.cursor;
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for _ in 0..n_tokens {
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if self.cursor.eof() {
break;
}
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last = self.cursor;
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let text: SmolStr = match self.cursor.token_tree() {
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Some(tt::TokenTree::Leaf(leaf)) => {
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// Mark the range if needed
let (text, id) = match leaf {
tt::Leaf::Ident(ident) => (ident.text.clone(), ident.id),
tt::Leaf::Punct(punct) => {
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assert!(punct.char.is_ascii());
let char = &(punct.char as u8);
let text = std::str::from_utf8(std::slice::from_ref(char)).unwrap();
(SmolStr::new_inline(text), punct.id)
}
tt::Leaf::Literal(lit) => (lit.text.clone(), lit.id),
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};
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let range = TextRange::at(self.text_pos, TextSize::of(text.as_str()));
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self.token_map.insert(id, range);
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self.cursor = self.cursor.bump();
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text
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}
Some(tt::TokenTree::Subtree(subtree)) => {
self.cursor = self.cursor.subtree().unwrap();
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if let Some(id) = subtree.delimiter.map(|it| it.id) {
self.open_delims.insert(id, self.text_pos);
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}
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delim_to_str(subtree.delimiter_kind(), false)
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}
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None => {
if let Some(parent) = self.cursor.end() {
self.cursor = self.cursor.bump();
if let Some(id) = parent.delimiter.map(|it| it.id) {
if let Some(open_delim) = self.open_delims.get(&id) {
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let open_range = TextRange::at(*open_delim, TextSize::of('('));
let close_range = TextRange::at(self.text_pos, TextSize::of('('));
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self.token_map.insert_delim(id, open_range, close_range);
}
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}
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delim_to_str(parent.delimiter_kind(), true)
} else {
continue;
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}
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}
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};
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self.buf += &text;
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self.text_pos += TextSize::of(text.as_str());
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}
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let text = SmolStr::new(self.buf.as_str());
self.buf.clear();
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self.inner.token(kind, text);
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// Add whitespace between adjoint puncts
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let next = last.bump();
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if let (
Some(tt::TokenTree::Leaf(tt::Leaf::Punct(curr))),
Some(tt::TokenTree::Leaf(tt::Leaf::Punct(_))),
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) = (last.token_tree(), next.token_tree())
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{
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// Note: We always assume the semi-colon would be the last token in
// other parts of RA such that we don't add whitespace here.
if curr.spacing == tt::Spacing::Alone && curr.char != ';' {
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self.inner.token(WHITESPACE, " ".into());
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self.text_pos += TextSize::of(' ');
}
}
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}
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fn start_node(&mut self, kind: SyntaxKind) {
self.inner.start_node(kind);
match self.roots.last_mut() {
None | Some(0) => self.roots.push(1),
Some(ref mut n) => **n += 1,
};
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}
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fn finish_node(&mut self) {
self.inner.finish_node();
*self.roots.last_mut().unwrap() -= 1;
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}
fn error(&mut self, error: ParseError) {
self.inner.error(error, self.text_pos)
}
}
#[cfg(test)]
mod tests {
use super::*;
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use crate::tests::parse_macro;
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use parser::TokenSource;
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use syntax::{
algo::{insert_children, InsertPosition},
ast::AstNode,
};
#[test]
fn convert_tt_token_source() {
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let expansion = parse_macro(
r#"
macro_rules! literals {
($i:ident) => {
{
let a = 'c';
let c = 1000;
let f = 12E+99_f64;
let s = "rust1";
}
}
}
"#,
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)
.expand_tt("literals!(foo);");
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let tts = &[expansion.into()];
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let buffer = tt::buffer::TokenBuffer::new(tts);
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let mut tt_src = SubtreeTokenSource::new(&buffer);
let mut tokens = vec![];
while tt_src.current().kind != EOF {
tokens.push((tt_src.current().kind, tt_src.text()));
tt_src.bump();
}
// [${]
// [let] [a] [=] ['c'] [;]
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assert_eq!(tokens[2 + 3].1, "'c'");
assert_eq!(tokens[2 + 3].0, CHAR);
// [let] [c] [=] [1000] [;]
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assert_eq!(tokens[2 + 5 + 3].1, "1000");
assert_eq!(tokens[2 + 5 + 3].0, INT_NUMBER);
// [let] [f] [=] [12E+99_f64] [;]
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assert_eq!(tokens[2 + 10 + 3].1, "12E+99_f64");
assert_eq!(tokens[2 + 10 + 3].0, FLOAT_NUMBER);
// [let] [s] [=] ["rust1"] [;]
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assert_eq!(tokens[2 + 15 + 3].1, "\"rust1\"");
assert_eq!(tokens[2 + 15 + 3].0, STRING);
}
#[test]
fn stmts_token_trees_to_expr_is_err() {
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let expansion = parse_macro(
r#"
macro_rules! stmts {
() => {
let a = 0;
let b = 0;
let c = 0;
let d = 0;
}
}
"#,
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)
.expand_tt("stmts!();");
assert!(token_tree_to_syntax_node(&expansion, FragmentKind::Expr).is_err());
}
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#[test]
fn test_token_tree_last_child_is_white_space() {
let source_file = ast::SourceFile::parse("f!({} );").ok().unwrap();
let macro_call = source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap();
let token_tree = macro_call.token_tree().unwrap();
// Token Tree now is :
// TokenTree
// - T!['(']
// - TokenTree
// - T!['{']
// - T!['}']
// - WHITE_SPACE
// - T![')']
let rbrace =
token_tree.syntax().descendants_with_tokens().find(|it| it.kind() == T!['}']).unwrap();
let space = token_tree
.syntax()
.descendants_with_tokens()
.find(|it| it.kind() == SyntaxKind::WHITESPACE)
.unwrap();
// reorder th white space, such that the white is inside the inner token-tree.
let token_tree = insert_children(
&rbrace.parent().unwrap(),
InsertPosition::Last,
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std::iter::once(space),
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);
// Token Tree now is :
// TokenTree
// - T!['{']
// - T!['}']
// - WHITE_SPACE
let token_tree = ast::TokenTree::cast(token_tree).unwrap();
let tt = ast_to_token_tree(&token_tree).unwrap().0;
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assert_eq!(tt.delimiter_kind(), Some(tt::DelimiterKind::Brace));
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}
#[test]
fn test_token_tree_multi_char_punct() {
let source_file = ast::SourceFile::parse("struct Foo { a: x::Y }").ok().unwrap();
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let struct_def = source_file.syntax().descendants().find_map(ast::Struct::cast).unwrap();
let tt = ast_to_token_tree(&struct_def).unwrap().0;
token_tree_to_syntax_node(&tt, FragmentKind::Item).unwrap();
}
}