1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // Format list-like macro invocations. These are invocations whose token trees
12 // can be interpreted as expressions and separated by commas.
13 // Note that these token trees do not actually have to be interpreted as
14 // expressions by the compiler. An example of an invocation we would reformat is
15 // foo!( x, y, z ). The token x may represent an identifier in the code, but we
16 // interpreted as an expression.
17 // Macro uses which are not-list like, such as bar!(key => val), will not be
19 // List-like invocations with parentheses will be formatted as function calls,
20 // and those with brackets will be formatted as array literals.
22 use std::collections::HashMap;
25 use syntax::{ast, ptr};
26 use syntax::codemap::{BytePos, Span};
27 use syntax::parse::new_parser_from_tts;
28 use syntax::parse::parser::Parser;
29 use syntax::parse::token::{BinOpToken, DelimToken, Token};
30 use syntax::print::pprust;
32 use syntax::tokenstream::{Cursor, ThinTokenStream, TokenStream, TokenTree};
33 use syntax::util::ThinVec;
35 use codemap::SpanUtils;
36 use comment::{contains_comment, remove_trailing_white_spaces, CharClasses, FindUncommented,
38 use expr::rewrite_array;
39 use lists::{itemize_list, write_list, ListFormatting};
41 use rewrite::{Rewrite, RewriteContext};
42 use shape::{Indent, Shape};
44 use utils::{format_visibility, mk_sp, wrap_str};
46 const FORCED_BRACKET_MACROS: &[&str] = &["vec!"];
48 // FIXME: use the enum from libsyntax?
49 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
56 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
57 pub enum MacroPosition {
65 fn opener(&self) -> &'static str {
67 MacroStyle::Parens => "(",
68 MacroStyle::Brackets => "[",
69 MacroStyle::Braces => "{",
76 Expr(ptr::P<ast::Expr>),
78 Pat(ptr::P<ast::Pat>),
79 // `parse_item` returns `Option<ptr::P<ast::Item>>`.
80 Item(Option<ptr::P<ast::Item>>),
83 impl Rewrite for ast::Item {
84 fn rewrite(&self, context: &RewriteContext, shape: Shape) -> Option<String> {
85 let mut visitor = ::visitor::FmtVisitor::from_context(context);
86 visitor.block_indent = shape.indent;
87 visitor.last_pos = self.span().lo();
88 visitor.visit_item(self);
93 impl Rewrite for MacroArg {
94 fn rewrite(&self, context: &RewriteContext, shape: Shape) -> Option<String> {
96 MacroArg::Expr(ref expr) => expr.rewrite(context, shape),
97 MacroArg::Ty(ref ty) => ty.rewrite(context, shape),
98 MacroArg::Pat(ref pat) => pat.rewrite(context, shape),
99 MacroArg::Item(ref item) => item.as_ref().and_then(|item| item.rewrite(context, shape)),
104 fn parse_macro_arg(parser: &mut Parser) -> Option<MacroArg> {
105 macro_rules! parse_macro_arg {
106 ($macro_arg: ident, $parser: ident) => {
107 let mut cloned_parser = (*parser).clone();
108 match cloned_parser.$parser() {
110 if parser.sess.span_diagnostic.has_errors() {
111 parser.sess.span_diagnostic.reset_err_count();
113 // Parsing succeeded.
114 *parser = cloned_parser;
115 return Some(MacroArg::$macro_arg(x.clone()));
120 parser.sess.span_diagnostic.reset_err_count();
126 parse_macro_arg!(Expr, parse_expr);
127 parse_macro_arg!(Ty, parse_ty);
128 parse_macro_arg!(Pat, parse_pat);
129 parse_macro_arg!(Item, parse_item);
134 /// Rewrite macro name without using pretty-printer if possible.
135 fn rewrite_macro_name(path: &ast::Path, extra_ident: Option<ast::Ident>) -> String {
136 let name = if path.segments.len() == 1 {
137 // Avoid using pretty-printer in the common case.
138 format!("{}!", path.segments[0].identifier)
143 Some(ident) if ident != symbol::keywords::Invalid.ident() => format!("{} {}", name, ident),
148 pub fn rewrite_macro(
150 extra_ident: Option<ast::Ident>,
151 context: &RewriteContext,
153 position: MacroPosition,
154 ) -> Option<String> {
155 let context = &mut context.clone();
156 context.inside_macro = true;
157 if context.config.use_try_shorthand() {
158 if let Some(expr) = convert_try_mac(mac, context) {
159 context.inside_macro = false;
160 return expr.rewrite(context, shape);
164 let original_style = macro_style(mac, context);
166 let macro_name = rewrite_macro_name(&mac.node.path, extra_ident);
168 let style = if FORCED_BRACKET_MACROS.contains(&¯o_name[..]) {
174 let ts: TokenStream = mac.node.stream();
175 let has_comment = contains_comment(context.snippet(mac.span));
176 if ts.is_empty() && !has_comment {
178 MacroStyle::Parens if position == MacroPosition::Item => {
179 Some(format!("{}();", macro_name))
181 MacroStyle::Parens => Some(format!("{}()", macro_name)),
182 MacroStyle::Brackets => Some(format!("{}[]", macro_name)),
183 MacroStyle::Braces => Some(format!("{}{{}}", macro_name)),
186 // Format well-known macros which cannot be parsed as a valid AST.
187 // TODO: Maybe add more macros?
188 if macro_name == "lazy_static!" && !has_comment {
189 if let success @ Some(..) = format_lazy_static(context, shape, &ts) {
194 let mut parser = new_parser_from_tts(context.parse_session, ts.trees().collect());
195 let mut arg_vec = Vec::new();
196 let mut vec_with_semi = false;
197 let mut trailing_comma = false;
199 if MacroStyle::Braces != style {
201 match parse_macro_arg(&mut parser) {
202 Some(arg) => arg_vec.push(arg),
203 None => return Some(context.snippet(mac.span).to_owned()),
210 // Try to parse `vec![expr; expr]`
211 if FORCED_BRACKET_MACROS.contains(&¯o_name[..]) {
213 if parser.token != Token::Eof {
214 match parse_macro_arg(&mut parser) {
218 if parser.token == Token::Eof && arg_vec.len() == 2 {
219 vec_with_semi = true;
223 None => return Some(context.snippet(mac.span).to_owned()),
227 return Some(context.snippet(mac.span).to_owned());
229 _ => return Some(context.snippet(mac.span).to_owned()),
234 if parser.token == Token::Eof {
235 trailing_comma = true;
242 MacroStyle::Parens => {
243 // Format macro invocation as function call, preserve the trailing
244 // comma because not all macros support them.
245 overflow::rewrite_with_parens(
248 &arg_vec.iter().map(|e| &*e).collect::<Vec<_>>()[..],
251 context.config.width_heuristics().fn_call_width,
253 Some(SeparatorTactic::Always)
255 Some(SeparatorTactic::Never)
257 ).map(|rw| match position {
258 MacroPosition::Item => format!("{};", rw),
262 MacroStyle::Brackets => {
263 let mac_shape = shape.offset_left(macro_name.len())?;
264 // Handle special case: `vec![expr; expr]`
266 let (lbr, rbr) = if context.config.spaces_within_parens_and_brackets() {
272 let total_overhead = lbr.len() + rbr.len() + 6;
273 let nested_shape = mac_shape.block_indent(context.config.tab_spaces());
274 let lhs = arg_vec[0].rewrite(context, nested_shape)?;
275 let rhs = arg_vec[1].rewrite(context, nested_shape)?;
276 if !lhs.contains('\n') && !rhs.contains('\n')
277 && lhs.len() + rhs.len() + total_overhead <= shape.width
279 Some(format!("{}{}{}; {}{}", macro_name, lbr, lhs, rhs, rbr))
285 nested_shape.indent.to_string_with_newline(context.config),
287 nested_shape.indent.to_string_with_newline(context.config),
289 shape.indent.to_string_with_newline(context.config),
294 // If we are rewriting `vec!` macro or other special macros,
295 // then we can rewrite this as an usual array literal.
296 // Otherwise, we must preserve the original existence of trailing comma.
297 if FORCED_BRACKET_MACROS.contains(¯o_name.as_str()) {
298 context.inside_macro = false;
299 trailing_comma = false;
301 // Convert `MacroArg` into `ast::Expr`, as `rewrite_array` only accepts the latter.
305 .span_after(mac.span, original_style.opener()),
306 mac.span.hi() - BytePos(1),
308 let arg_vec = &arg_vec.iter().map(|e| &*e).collect::<Vec<_>>()[..];
309 let rewrite = rewrite_array(arg_vec, sp, context, mac_shape, trailing_comma)?;
310 let comma = match position {
311 MacroPosition::Item => ";",
315 Some(format!("{}{}{}", macro_name, rewrite, comma))
318 MacroStyle::Braces => {
319 // Skip macro invocations with braces, for now.
320 indent_macro_snippet(context, context.snippet(mac.span), shape.indent)
325 pub fn rewrite_macro_def(
326 context: &RewriteContext,
331 vis: &ast::Visibility,
333 ) -> Option<String> {
334 let snippet = Some(remove_trailing_white_spaces(context.snippet(span)));
335 if snippet.as_ref().map_or(true, |s| s.ends_with(';')) {
339 let mut parser = MacroParser::new(def.stream().into_trees());
340 let parsed_def = match parser.parse() {
342 None => return snippet,
345 let mut result = if def.legacy {
346 String::from("macro_rules!")
348 format!("{}macro", format_visibility(vis))
352 result += &ident.name.as_str();
354 let multi_branch_style = def.legacy || parsed_def.branches.len() != 1;
356 let arm_shape = if multi_branch_style {
358 .block_indent(context.config.tab_spaces())
359 .with_max_width(context.config)
364 let branch_items = itemize_list(
365 context.snippet_provider,
366 parsed_def.branches.iter(),
369 |branch| branch.span.lo(),
370 |branch| branch.span.hi(),
371 |branch| branch.rewrite(context, arm_shape, multi_branch_style),
372 context.snippet_provider.span_after(span, "{"),
375 ).collect::<Vec<_>>();
377 let fmt = ListFormatting {
378 tactic: DefinitiveListTactic::Vertical,
379 separator: if def.legacy { ";" } else { "" },
380 trailing_separator: SeparatorTactic::Always,
381 separator_place: SeparatorPlace::Back,
383 ends_with_newline: true,
384 preserve_newline: true,
385 config: context.config,
388 if multi_branch_style {
390 result += &arm_shape.indent.to_string_with_newline(context.config);
393 result += write_list(&branch_items, &fmt)?.as_str();
395 if multi_branch_style {
396 result += &indent.to_string_with_newline(context.config);
403 // Replaces `$foo` with `zfoo`. We must check for name overlap to ensure we
404 // aren't causing problems.
405 // This should also work for escaped `$` variables, where we leave earlier `$`s.
406 fn replace_names(input: &str) -> Option<(String, HashMap<String, String>)> {
407 // Each substitution will require five or six extra bytes.
408 let mut result = String::with_capacity(input.len() + 64);
409 let mut substs = HashMap::new();
410 let mut dollar_count = 0;
411 let mut cur_name = String::new();
413 for (kind, c) in CharClasses::new(input.chars()) {
414 if kind != FullCodeCharKind::Normal {
418 } else if dollar_count == 0 {
420 } else if !c.is_alphanumeric() && !cur_name.is_empty() {
421 // Terminates a name following one or more dollars.
422 let mut new_name = String::new();
423 let mut old_name = String::new();
425 for _ in 0..(dollar_count - 1) {
430 new_name.push_str(&cur_name);
431 old_name.push_str(&cur_name);
433 result.push_str(&new_name);
434 substs.insert(old_name, new_name);
439 cur_name = String::new();
440 } else if c == '(' && cur_name.is_empty() {
441 // FIXME: Support macro def with repeat.
443 } else if c.is_alphanumeric() {
448 // FIXME: duplicate code
449 if !cur_name.is_empty() {
450 let mut new_name = String::new();
451 let mut old_name = String::new();
453 for _ in 0..(dollar_count - 1) {
458 new_name.push_str(&cur_name);
459 old_name.push_str(&cur_name);
461 result.push_str(&new_name);
462 substs.insert(old_name, new_name);
465 debug!("replace_names `{}` {:?}", result, substs);
467 Some((result, substs))
470 // This is a bit sketchy. The token rules probably need tweaking, but it works
471 // for some common cases. I hope the basic logic is sufficient. Note that the
472 // meaning of some tokens is a bit different here from usual Rust, e.g., `*`
473 // and `(`/`)` have special meaning.
475 // We always try and format on one line.
476 // FIXME: Use multi-line when every thing does not fit on one line.
477 fn format_macro_args(toks: ThinTokenStream, shape: Shape) -> Option<String> {
478 let mut result = String::with_capacity(128);
479 let mut insert_space = SpaceState::Never;
481 for tok in (toks.into(): TokenStream).trees() {
483 TokenTree::Token(_, t) => {
484 if !result.is_empty() && force_space_before(&t) {
485 insert_space = SpaceState::Always;
487 if force_no_space_before(&t) {
488 insert_space = SpaceState::Never;
490 match (insert_space, ident_like(&t)) {
491 (SpaceState::Always, _)
492 | (SpaceState::Punctuation, false)
493 | (SpaceState::Ident, true) => {
498 result.push_str(&pprust::token_to_string(&t));
499 insert_space = next_space(&t);
501 TokenTree::Delimited(_, d) => {
502 if let SpaceState::Always = insert_space {
505 let formatted = format_macro_args(d.tts, shape)?;
507 DelimToken::Paren => {
508 result.push_str(&format!("({})", formatted));
509 insert_space = SpaceState::Always;
511 DelimToken::Bracket => {
512 result.push_str(&format!("[{}]", formatted));
513 insert_space = SpaceState::Always;
515 DelimToken::Brace => {
516 result.push_str(&format!(" {{ {} }}", formatted));
517 insert_space = SpaceState::Always;
519 DelimToken::NoDelim => {
520 result.push_str(&format!("{}", formatted));
521 insert_space = SpaceState::Always;
528 if result.len() <= shape.width {
535 // We should insert a space if the next token is a:
536 #[derive(Copy, Clone)]
540 Ident, // Or ident/literal-like thing.
544 fn force_space_before(tok: &Token) -> bool {
563 | Token::Dollar => true,
564 Token::BinOp(bot) => bot != BinOpToken::Star,
569 fn force_no_space_before(tok: &Token) -> bool {
571 Token::Semi | Token::Comma | Token::Dot => true,
572 Token::BinOp(bot) => bot == BinOpToken::Star,
576 fn ident_like(tok: &Token) -> bool {
578 Token::Ident(_) | Token::Literal(..) | Token::Lifetime(_) => true,
583 fn next_space(tok: &Token) -> SpaceState {
596 | Token::BinOp(_) => SpaceState::Punctuation,
601 | Token::OpenDelim(_)
602 | Token::CloseDelim(_)
603 | Token::Whitespace => SpaceState::Never,
605 Token::Literal(..) | Token::Ident(_) | Token::Lifetime(_) => SpaceState::Ident,
607 _ => SpaceState::Always,
611 /// Tries to convert a macro use into a short hand try expression. Returns None
612 /// when the macro is not an instance of try! (or parsing the inner expression
614 pub fn convert_try_mac(mac: &ast::Mac, context: &RewriteContext) -> Option<ast::Expr> {
615 if &format!("{}", mac.node.path)[..] == "try" {
616 let ts: TokenStream = mac.node.tts.clone().into();
617 let mut parser = new_parser_from_tts(context.parse_session, ts.trees().collect());
620 id: ast::NodeId::new(0), // dummy value
621 node: ast::ExprKind::Try(parser.parse_expr().ok()?),
622 span: mac.span, // incorrect span, but shouldn't matter too much
623 attrs: ThinVec::new(),
630 fn macro_style(mac: &ast::Mac, context: &RewriteContext) -> MacroStyle {
631 let snippet = context.snippet(mac.span);
632 let paren_pos = snippet.find_uncommented("(").unwrap_or(usize::max_value());
633 let bracket_pos = snippet.find_uncommented("[").unwrap_or(usize::max_value());
634 let brace_pos = snippet.find_uncommented("{").unwrap_or(usize::max_value());
636 if paren_pos < bracket_pos && paren_pos < brace_pos {
638 } else if bracket_pos < brace_pos {
645 /// Indent each line according to the specified `indent`.
673 fn indent_macro_snippet(
674 context: &RewriteContext,
677 ) -> Option<String> {
678 let mut lines = macro_str.lines();
679 let first_line = lines.next().map(|s| s.trim_right())?;
680 let mut trimmed_lines = Vec::with_capacity(16);
682 let min_prefix_space_width = lines
684 let prefix_space_width = if is_empty_line(line) {
687 Some(get_prefix_space_width(context, line))
689 trimmed_lines.push((line.trim(), prefix_space_width));
695 String::from(first_line) + "\n"
698 .map(|&(line, prefix_space_width)| match prefix_space_width {
699 Some(original_indent_width) => {
700 let new_indent_width = indent.width()
701 + original_indent_width
702 .checked_sub(min_prefix_space_width)
704 let new_indent = Indent::from_width(context.config, new_indent_width);
705 format!("{}{}", new_indent.to_string(context.config), line.trim())
707 None => String::new(),
714 fn get_prefix_space_width(context: &RewriteContext, s: &str) -> usize {
719 '\t' => width += context.config.tab_spaces(),
726 fn is_empty_line(s: &str) -> bool {
727 s.is_empty() || s.chars().all(char::is_whitespace)
730 // A very simple parser that just parses a macros 2.0 definition into its branches.
731 // Currently we do not attempt to parse any further than that.
738 // (`(` ... `)` `=>` `{` ... `}`)*
739 fn parse(&mut self) -> Option<Macro> {
740 let mut branches = vec![];
741 while self.toks.look_ahead(1).is_some() {
742 branches.push(self.parse_branch()?);
745 Some(Macro { branches })
748 // `(` ... `)` `=>` `{` ... `}`
749 fn parse_branch(&mut self) -> Option<MacroBranch> {
750 let tok = self.toks.next()?;
751 let (lo, args_paren_kind) = match tok {
752 TokenTree::Token(..) => return None,
753 TokenTree::Delimited(sp, ref d) => (sp.lo(), d.delim),
755 let args = tok.joint().into();
756 match self.toks.next()? {
757 TokenTree::Token(_, Token::FatArrow) => {}
760 let (mut hi, body) = match self.toks.next()? {
761 TokenTree::Token(..) => return None,
762 TokenTree::Delimited(sp, _) => {
763 let data = sp.data();
766 Span::new(data.lo + BytePos(1), data.hi - BytePos(1), data.ctxt),
770 if let Some(TokenTree::Token(sp, Token::Semi)) = self.toks.look_ahead(0) {
783 // A parsed macros 2.0 macro definition.
785 branches: Vec<MacroBranch>,
788 // FIXME: it would be more efficient to use references to the token streams
789 // rather than clone them, if we can make the borrowing work out.
792 args_paren_kind: DelimToken,
793 args: ThinTokenStream,
800 context: &RewriteContext,
802 multi_branch_style: bool,
803 ) -> Option<String> {
804 // Only attempt to format function-like macros.
805 if self.args_paren_kind != DelimToken::Paren {
806 // FIXME(#1539): implement for non-sugared macros.
811 let mut result = format_macro_args(self.args.clone(), shape.sub_width(5)?)?;
813 if multi_branch_style {
817 // The macro body is the most interesting part. It might end up as various
818 // AST nodes, but also has special variables (e.g, `$foo`) which can't be
819 // parsed as regular Rust code (and note that these can be escaped using
820 // `$$`). We'll try and format like an AST node, but we'll substitute
821 // variables for new names with the same length first.
823 let old_body = context.snippet(self.body).trim();
824 let (body_str, substs) = replace_names(old_body)?;
826 let mut config = context.config.clone();
827 config.set().hide_parse_errors(true);
831 let has_block_body = old_body.starts_with('{');
833 let body_indent = if has_block_body {
836 // We'll hack the indent below, take this into account when formatting,
837 let body_indent = shape.indent.block_indent(&config);
838 let new_width = config.max_width() - body_indent.width();
839 config.set().max_width(new_width);
843 // First try to format as items, then as statements.
844 let new_body = match ::format_snippet(&body_str, &config) {
845 Some(new_body) => new_body,
846 None => match ::format_code_block(&body_str, &config) {
847 Some(new_body) => new_body,
851 let new_body = wrap_str(new_body, config.max_width(), shape)?;
853 // Indent the body since it is in a block.
854 let indent_str = body_indent.to_string(&config);
855 let mut new_body = new_body
858 .fold(String::new(), |mut s, l| {
865 // Undo our replacement of macro variables.
866 // FIXME: this could be *much* more efficient.
867 for (old, new) in &substs {
868 if old_body.find(new).is_some() {
869 debug!("rewrite_macro_def: bailing matching variable: `{}`", new);
872 new_body = new_body.replace(new, old);
876 result += new_body.trim();
877 } else if !new_body.is_empty() {
880 result += &shape.indent.to_string(&config);
889 /// Format `lazy_static!` from https://crates.io/crates/lazy_static.
891 /// # Expected syntax
895 /// [pub] static ref NAME_1: TYPE_1 = EXPR_1;
896 /// [pub] static ref NAME_2: TYPE_2 = EXPR_2;
898 /// [pub] static ref NAME_N: TYPE_N = EXPR_N;
901 fn format_lazy_static(context: &RewriteContext, shape: Shape, ts: &TokenStream) -> Option<String> {
902 let mut result = String::with_capacity(1024);
903 let mut parser = new_parser_from_tts(context.parse_session, ts.trees().collect());
904 let nested_shape = shape.block_indent(context.config.tab_spaces());
906 result.push_str("lazy_static! {");
907 result.push_str(&nested_shape.indent.to_string_with_newline(context.config));
909 macro parse_or($method:ident $(,)* $($arg:expr),* $(,)*) {
910 match parser.$method($($arg,)*) {
912 if parser.sess.span_diagnostic.has_errors() {
913 parser.sess.span_diagnostic.reset_err_count();
921 parser.sess.span_diagnostic.reset_err_count();
927 while parser.token != Token::Eof {
928 // Parse a `lazy_static!` item.
929 let vis = ::utils::format_visibility(&parse_or!(parse_visibility, false));
930 parser.eat_keyword(symbol::keywords::Static);
931 parser.eat_keyword(symbol::keywords::Ref);
932 let id = parse_or!(parse_ident);
933 parser.eat(&Token::Colon);
934 let ty = parse_or!(parse_ty);
935 parser.eat(&Token::Eq);
936 let expr = parse_or!(parse_expr);
937 parser.eat(&Token::Semi);
939 // Rewrite as a static item.
940 let mut stmt = String::with_capacity(128);
941 stmt.push_str(&format!(
942 "{}static ref {}: {} =",
945 ty.rewrite(context, nested_shape)?
947 result.push_str(&::expr::rewrite_assign_rhs(
951 nested_shape.sub_width(1)?,
954 if parser.token != Token::Eof {
955 result.push_str(&nested_shape.indent.to_string_with_newline(context.config));
959 result.push_str(&shape.indent.to_string_with_newline(context.config));
969 use syntax::parse::{parse_stream_from_source_str, ParseSess};
970 use syntax::codemap::{FileName, FilePathMapping};
972 fn format_macro_args_str(s: &str) -> String {
973 let mut result = String::new();
974 syntax::with_globals(|| {
975 let input = parse_stream_from_source_str(
976 FileName::Custom("stdin".to_owned()),
978 &ParseSess::new(FilePathMapping::empty()),
983 indent: Indent::empty(),
986 result = format_macro_args(input.into(), shape).unwrap();
992 fn test_format_macro_args() {
993 assert_eq!(format_macro_args_str(""), "".to_owned());
994 assert_eq!(format_macro_args_str("$ x : ident"), "$x: ident".to_owned());
996 format_macro_args_str("$ m1 : ident , $ m2 : ident , $ x : ident"),
997 "$m1: ident, $m2: ident, $x: ident".to_owned()
1000 format_macro_args_str("$($beginning:ident),*;$middle:ident;$($end:ident),*"),
1001 "$($beginning: ident),*; $middle: ident; $($end: ident),*".to_owned()
1004 format_macro_args_str(
1005 "$ name : ident ( $ ( $ dol : tt $ var : ident ) * ) $ ( $ body : tt ) *"
1007 "$name: ident($($dol: tt $var: ident)*) $($body: tt)*".to_owned()