Rollup merge of #62258 - petrochenkov:idclean, r=Centril
syntax: Unsupport `foo! bar { ... }` macros in the parser
Their support in expansion was removed in https://github.com/rust-lang/rust/pull/61606.
Also un-reserve `macro_rules` as a macro name, there's no ambiguity between `macro_rules` definitions and macro calls (it also wasn't reserved correctly).
cc https://github.com/rust-lang-nursery/wg-grammar/issues/51
This commit is contained in:
Mazdak Farrokhzad
GitHub
commit
8867ba19de
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@ -6,7 +6,7 @@ use rustc::util::nodemap::FxHashMap;
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use syntax::ext::base::{SyntaxExtension, SyntaxExtensionKind, NamedSyntaxExtension};
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use syntax::ext::base::MacroExpanderFn;
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use syntax::symbol::{Symbol, sym};
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use syntax::symbol::Symbol;
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use syntax::ast;
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use syntax::feature_gate::AttributeType;
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use syntax_pos::Span;
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@ -85,9 +85,6 @@ impl<'a> Registry<'a> {
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///
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/// This is the most general hook into `libsyntax`'s expansion behavior.
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pub fn register_syntax_extension(&mut self, name: ast::Name, mut extension: SyntaxExtension) {
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if name == sym::macro_rules {
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panic!("user-defined macros may not be named `macro_rules`");
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}
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if extension.def_info.is_none() {
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extension.def_info = Some((ast::CRATE_NODE_ID, self.krate_span));
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}
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@ -1109,9 +1109,6 @@ impl<'a> Resolver<'a> {
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current_legacy_scope: &mut LegacyScope<'a>) {
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self.local_macro_def_scopes.insert(item.id, self.current_module);
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let ident = item.ident;
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if ident.name == sym::macro_rules {
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self.session.span_err(item.span, "user-defined macros may not be named `macro_rules`");
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}
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let def_id = self.definitions.local_def_id(item.id);
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let ext = Lrc::new(macro_rules::compile(&self.session.parse_sess,
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@ -13,8 +13,7 @@ use crate::parse::{DirectoryOwnership, PResult, ParseSess};
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use crate::parse::token;
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use crate::parse::parser::Parser;
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use crate::ptr::P;
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use crate::symbol::Symbol;
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use crate::symbol::{kw, sym};
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use crate::symbol::{sym, Symbol};
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use crate::tokenstream::{TokenStream, TokenTree};
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use crate::visit::{self, Visitor};
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use crate::util::map_in_place::MapInPlace;
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@ -197,7 +196,6 @@ pub struct Invocation {
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pub enum InvocationKind {
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Bang {
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mac: ast::Mac,
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ident: Option<Ident>,
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span: Span,
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},
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Attr {
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@ -664,13 +662,12 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
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ext: &SyntaxExtension)
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-> Option<AstFragment> {
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let kind = invoc.fragment_kind;
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let (mac, ident, span) = match invoc.kind {
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InvocationKind::Bang { mac, ident, span } => (mac, ident, span),
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let (mac, span) = match invoc.kind {
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InvocationKind::Bang { mac, span } => (mac, span),
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_ => unreachable!(),
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};
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let path = &mac.node.path;
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let ident = ident.unwrap_or_else(|| Ident::invalid());
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let validate = |this: &mut Self| {
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// feature-gate the macro invocation
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if let Some((feature, issue)) = ext.unstable_feature {
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@ -690,12 +687,6 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
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}
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}
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if ident.name != kw::Invalid {
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let msg = format!("macro {}! expects no ident argument, given '{}'", path, ident);
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this.cx.span_err(path.span, &msg);
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this.cx.trace_macros_diag();
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return Err(kind.dummy(span));
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}
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Ok(())
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};
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@ -729,19 +720,11 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
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}
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SyntaxExtensionKind::Bang(expander) => {
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if ident.name != kw::Invalid {
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let msg =
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format!("macro {}! expects no ident argument, given '{}'", path, ident);
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self.cx.span_err(path.span, &msg);
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self.cx.trace_macros_diag();
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kind.dummy(span)
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} else {
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self.gate_proc_macro_expansion_kind(span, kind);
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let tok_result = expander.expand(self.cx, span, mac.node.stream());
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let result = self.parse_ast_fragment(tok_result, kind, path, span);
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self.gate_proc_macro_expansion(span, &result);
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result
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}
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self.gate_proc_macro_expansion_kind(span, kind);
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let tok_result = expander.expand(self.cx, span, mac.node.stream());
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let result = self.parse_ast_fragment(tok_result, kind, path, span);
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self.gate_proc_macro_expansion(span, &result);
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result
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}
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};
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@ -944,7 +927,7 @@ impl<'a, 'b> InvocationCollector<'a, 'b> {
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}
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fn collect_bang(&mut self, mac: ast::Mac, span: Span, kind: AstFragmentKind) -> AstFragment {
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self.collect(kind, InvocationKind::Bang { mac, ident: None, span })
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self.collect(kind, InvocationKind::Bang { mac, span })
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}
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fn collect_attr(&mut self,
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@ -1179,13 +1162,9 @@ impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
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ast::ItemKind::Mac(..) => {
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self.check_attributes(&item.attrs);
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item.and_then(|item| match item.node {
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ItemKind::Mac(mac) => {
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self.collect(AstFragmentKind::Items, InvocationKind::Bang {
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mac,
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ident: Some(item.ident),
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span: item.span,
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}).make_items()
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}
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ItemKind::Mac(mac) => self.collect(
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AstFragmentKind::Items, InvocationKind::Bang { mac, span: item.span }
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).make_items(),
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_ => unreachable!(),
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})
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}
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@ -4324,51 +4324,49 @@ impl<'a> Parser<'a> {
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fn eat_macro_def(&mut self, attrs: &[Attribute], vis: &Visibility, lo: Span)
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-> PResult<'a, Option<P<Item>>> {
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let token_lo = self.token.span;
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let (ident, def) = match self.token.kind {
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token::Ident(name, false) if name == kw::Macro => {
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self.bump();
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let ident = self.parse_ident()?;
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let tokens = if self.check(&token::OpenDelim(token::Brace)) {
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match self.parse_token_tree() {
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TokenTree::Delimited(_, _, tts) => tts,
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_ => unreachable!(),
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}
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} else if self.check(&token::OpenDelim(token::Paren)) {
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let args = self.parse_token_tree();
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let body = if self.check(&token::OpenDelim(token::Brace)) {
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self.parse_token_tree()
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} else {
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self.unexpected()?;
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unreachable!()
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};
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TokenStream::new(vec![
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args.into(),
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TokenTree::token(token::FatArrow, token_lo.to(self.prev_span)).into(),
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body.into(),
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])
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let (ident, def) = if self.eat_keyword(kw::Macro) {
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let ident = self.parse_ident()?;
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let tokens = if self.check(&token::OpenDelim(token::Brace)) {
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match self.parse_token_tree() {
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TokenTree::Delimited(_, _, tts) => tts,
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_ => unreachable!(),
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}
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} else if self.check(&token::OpenDelim(token::Paren)) {
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let args = self.parse_token_tree();
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let body = if self.check(&token::OpenDelim(token::Brace)) {
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self.parse_token_tree()
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} else {
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self.unexpected()?;
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unreachable!()
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};
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TokenStream::new(vec![
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args.into(),
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TokenTree::token(token::FatArrow, token_lo.to(self.prev_span)).into(),
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body.into(),
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])
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} else {
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self.unexpected()?;
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unreachable!()
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};
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(ident, ast::MacroDef { tokens: tokens.into(), legacy: false })
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(ident, ast::MacroDef { tokens: tokens.into(), legacy: false })
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} else if self.check_keyword(sym::macro_rules) &&
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self.look_ahead(1, |t| *t == token::Not) &&
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self.look_ahead(2, |t| t.is_ident()) {
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let prev_span = self.prev_span;
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self.complain_if_pub_macro(&vis.node, prev_span);
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self.bump();
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self.bump();
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let ident = self.parse_ident()?;
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let (delim, tokens) = self.expect_delimited_token_tree()?;
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if delim != MacDelimiter::Brace && !self.eat(&token::Semi) {
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self.report_invalid_macro_expansion_item();
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}
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token::Ident(name, _) if name == sym::macro_rules &&
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self.look_ahead(1, |t| *t == token::Not) => {
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let prev_span = self.prev_span;
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self.complain_if_pub_macro(&vis.node, prev_span);
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self.bump();
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self.bump();
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let ident = self.parse_ident()?;
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let (delim, tokens) = self.expect_delimited_token_tree()?;
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if delim != MacDelimiter::Brace && !self.eat(&token::Semi) {
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self.report_invalid_macro_expansion_item();
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}
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(ident, ast::MacroDef { tokens, legacy: true })
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}
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_ => return Ok(None),
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(ident, ast::MacroDef { tokens, legacy: true })
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} else {
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return Ok(None);
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};
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let span = lo.to(self.prev_span);
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@ -4412,14 +4410,14 @@ impl<'a> Parser<'a> {
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!self.is_existential_type_decl() &&
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!self.is_auto_trait_item() &&
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!self.is_async_fn() {
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let pth = self.parse_path(PathStyle::Expr)?;
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let path = self.parse_path(PathStyle::Expr)?;
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if !self.eat(&token::Not) {
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let expr = if self.check(&token::OpenDelim(token::Brace)) {
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self.parse_struct_expr(lo, pth, ThinVec::new())?
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self.parse_struct_expr(lo, path, ThinVec::new())?
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} else {
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let hi = self.prev_span;
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self.mk_expr(lo.to(hi), ExprKind::Path(None, pth), ThinVec::new())
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self.mk_expr(lo.to(hi), ExprKind::Path(None, path), ThinVec::new())
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};
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let expr = self.with_res(Restrictions::STMT_EXPR, |this| {
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@ -4434,34 +4432,6 @@ impl<'a> Parser<'a> {
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}));
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}
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// it's a macro invocation
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let id = match self.token.kind {
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token::OpenDelim(_) => Ident::invalid(), // no special identifier
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_ => self.parse_ident()?,
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};
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// check that we're pointing at delimiters (need to check
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// again after the `if`, because of `parse_ident`
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// consuming more tokens).
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match self.token.kind {
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token::OpenDelim(_) => {}
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_ => {
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// we only expect an ident if we didn't parse one
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// above.
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let ident_str = if id.name == kw::Invalid {
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"identifier, "
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} else {
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""
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};
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let tok_str = self.this_token_descr();
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let mut err = self.fatal(&format!("expected {}`(` or `{{`, found {}",
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ident_str,
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tok_str));
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err.span_label(self.token.span, format!("expected {}`(` or `{{`", ident_str));
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return Err(err)
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},
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}
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let (delim, tts) = self.expect_delimited_token_tree()?;
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let hi = self.prev_span;
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@ -4471,59 +4441,38 @@ impl<'a> Parser<'a> {
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MacStmtStyle::NoBraces
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};
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if id.name == kw::Invalid {
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let mac = respan(lo.to(hi), Mac_ { path: pth, tts, delim });
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let node = if delim == MacDelimiter::Brace ||
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self.token == token::Semi || self.token == token::Eof {
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StmtKind::Mac(P((mac, style, attrs.into())))
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}
|
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// We used to incorrectly stop parsing macro-expanded statements here.
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// If the next token will be an error anyway but could have parsed with the
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// earlier behavior, stop parsing here and emit a warning to avoid breakage.
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else if macro_legacy_warnings &&
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self.token.can_begin_expr() &&
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match self.token.kind {
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// These can continue an expression, so we can't stop parsing and warn.
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token::OpenDelim(token::Paren) | token::OpenDelim(token::Bracket) |
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token::BinOp(token::Minus) | token::BinOp(token::Star) |
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token::BinOp(token::And) | token::BinOp(token::Or) |
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token::AndAnd | token::OrOr |
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token::DotDot | token::DotDotDot | token::DotDotEq => false,
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_ => true,
|
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} {
|
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self.warn_missing_semicolon();
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StmtKind::Mac(P((mac, style, attrs.into())))
|
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} else {
|
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let e = self.mk_expr(mac.span, ExprKind::Mac(mac), ThinVec::new());
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let e = self.maybe_recover_from_bad_qpath(e, true)?;
|
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let e = self.parse_dot_or_call_expr_with(e, lo, attrs.into())?;
|
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let e = self.parse_assoc_expr_with(0, LhsExpr::AlreadyParsed(e))?;
|
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StmtKind::Expr(e)
|
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};
|
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Stmt {
|
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id: ast::DUMMY_NODE_ID,
|
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span: lo.to(hi),
|
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node,
|
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}
|
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let mac = respan(lo.to(hi), Mac_ { path, tts, delim });
|
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let node = if delim == MacDelimiter::Brace ||
|
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self.token == token::Semi || self.token == token::Eof {
|
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StmtKind::Mac(P((mac, style, attrs.into())))
|
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}
|
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// We used to incorrectly stop parsing macro-expanded statements here.
|
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// If the next token will be an error anyway but could have parsed with the
|
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// earlier behavior, stop parsing here and emit a warning to avoid breakage.
|
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else if macro_legacy_warnings &&
|
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self.token.can_begin_expr() &&
|
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match self.token.kind {
|
||||
// These can continue an expression, so we can't stop parsing and warn.
|
||||
token::OpenDelim(token::Paren) | token::OpenDelim(token::Bracket) |
|
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token::BinOp(token::Minus) | token::BinOp(token::Star) |
|
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token::BinOp(token::And) | token::BinOp(token::Or) |
|
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token::AndAnd | token::OrOr |
|
||||
token::DotDot | token::DotDotDot | token::DotDotEq => false,
|
||||
_ => true,
|
||||
} {
|
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self.warn_missing_semicolon();
|
||||
StmtKind::Mac(P((mac, style, attrs.into())))
|
||||
} else {
|
||||
// if it has a special ident, it's definitely an item
|
||||
//
|
||||
// Require a semicolon or braces.
|
||||
if style != MacStmtStyle::Braces && !self.eat(&token::Semi) {
|
||||
self.report_invalid_macro_expansion_item();
|
||||
}
|
||||
let span = lo.to(hi);
|
||||
Stmt {
|
||||
id: ast::DUMMY_NODE_ID,
|
||||
span,
|
||||
node: StmtKind::Item({
|
||||
self.mk_item(
|
||||
span, id /*id is good here*/,
|
||||
ItemKind::Mac(respan(span, Mac_ { path: pth, tts, delim })),
|
||||
respan(lo, VisibilityKind::Inherited),
|
||||
attrs)
|
||||
}),
|
||||
}
|
||||
let e = self.mk_expr(mac.span, ExprKind::Mac(mac), ThinVec::new());
|
||||
let e = self.maybe_recover_from_bad_qpath(e, true)?;
|
||||
let e = self.parse_dot_or_call_expr_with(e, lo, attrs.into())?;
|
||||
let e = self.parse_assoc_expr_with(0, LhsExpr::AlreadyParsed(e))?;
|
||||
StmtKind::Expr(e)
|
||||
};
|
||||
Stmt {
|
||||
id: ast::DUMMY_NODE_ID,
|
||||
span: lo.to(hi),
|
||||
node,
|
||||
}
|
||||
} else {
|
||||
// FIXME: Bad copy of attrs
|
||||
|
|
@ -7619,26 +7568,17 @@ impl<'a> Parser<'a> {
|
|||
let mac_lo = self.token.span;
|
||||
|
||||
// item macro.
|
||||
let pth = self.parse_path(PathStyle::Mod)?;
|
||||
let path = self.parse_path(PathStyle::Mod)?;
|
||||
self.expect(&token::Not)?;
|
||||
|
||||
// a 'special' identifier (like what `macro_rules!` uses)
|
||||
// is optional. We should eventually unify invoc syntax
|
||||
// and remove this.
|
||||
let id = if self.token.is_ident() {
|
||||
self.parse_ident()?
|
||||
} else {
|
||||
Ident::invalid() // no special identifier
|
||||
};
|
||||
// eat a matched-delimiter token tree:
|
||||
let (delim, tts) = self.expect_delimited_token_tree()?;
|
||||
if delim != MacDelimiter::Brace && !self.eat(&token::Semi) {
|
||||
self.report_invalid_macro_expansion_item();
|
||||
}
|
||||
|
||||
let hi = self.prev_span;
|
||||
let mac = respan(mac_lo.to(hi), Mac_ { path: pth, tts, delim });
|
||||
let item = self.mk_item(lo.to(hi), id, ItemKind::Mac(mac), visibility, attrs);
|
||||
let mac = respan(mac_lo.to(hi), Mac_ { path, tts, delim });
|
||||
let item =
|
||||
self.mk_item(lo.to(hi), Ident::invalid(), ItemKind::Mac(mac), visibility, attrs);
|
||||
return Ok(Some(item));
|
||||
}
|
||||
|
||||
|
|
@ -7664,9 +7604,9 @@ impl<'a> Parser<'a> {
|
|||
!(self.is_async_fn() && self.token.span.rust_2015()) {
|
||||
let prev_span = self.prev_span;
|
||||
let lo = self.token.span;
|
||||
let pth = self.parse_path(PathStyle::Mod)?;
|
||||
let path = self.parse_path(PathStyle::Mod)?;
|
||||
|
||||
if pth.segments.len() == 1 {
|
||||
if path.segments.len() == 1 {
|
||||
if !self.eat(&token::Not) {
|
||||
return Err(self.missing_assoc_item_kind_err(item_kind, prev_span));
|
||||
}
|
||||
|
|
@ -7686,7 +7626,7 @@ impl<'a> Parser<'a> {
|
|||
self.expect(&token::Semi)?;
|
||||
}
|
||||
|
||||
Ok(Some(respan(lo.to(self.prev_span), Mac_ { path: pth, tts, delim })))
|
||||
Ok(Some(respan(lo.to(self.prev_span), Mac_ { path, tts, delim })))
|
||||
} else {
|
||||
Ok(None)
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,7 +1,7 @@
|
|||
// run-pass
|
||||
#![feature(decl_macro)]
|
||||
|
||||
r#macro_rules! r#struct {
|
||||
macro_rules! r#struct {
|
||||
($r#struct:expr) => { $r#struct }
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -11,13 +11,9 @@ macro_rules! foo{
|
|||
pub fn main() {
|
||||
foo!();
|
||||
|
||||
assert!({one! two()});
|
||||
//~^ ERROR macros that expand to items
|
||||
//~| ERROR cannot find macro `one!` in this scope
|
||||
//~| ERROR mismatched types
|
||||
assert!({one! two()}); //~ ERROR expected open delimiter
|
||||
|
||||
// regardless of whether nested macro_rules works, the following should at
|
||||
// least throw a conventional error.
|
||||
assert!({one! two});
|
||||
//~^ ERROR expected `(` or `{`, found `}`
|
||||
assert!({one! two}); //~ ERROR expected open delimiter
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,38 +1,14 @@
|
|||
error: macros that expand to items must be delimited with braces or followed by a semicolon
|
||||
--> $DIR/issue-10536.rs:14:22
|
||||
error: expected open delimiter
|
||||
--> $DIR/issue-10536.rs:14:19
|
||||
|
|
||||
LL | assert!({one! two()});
|
||||
| ^^
|
||||
help: change the delimiters to curly braces
|
||||
|
|
||||
LL | assert!({one! two {}});
|
||||
| ^^
|
||||
help: add a semicolon
|
||||
|
|
||||
LL | assert!({one! two();});
|
||||
| ^
|
||||
| ^^^ expected open delimiter
|
||||
|
||||
error: expected `(` or `{`, found `}`
|
||||
--> $DIR/issue-10536.rs:21:22
|
||||
error: expected open delimiter
|
||||
--> $DIR/issue-10536.rs:18:19
|
||||
|
|
||||
LL | assert!({one! two});
|
||||
| ^ expected `(` or `{`
|
||||
| ^^^ expected open delimiter
|
||||
|
||||
error: cannot find macro `one!` in this scope
|
||||
--> $DIR/issue-10536.rs:14:14
|
||||
|
|
||||
LL | assert!({one! two()});
|
||||
| ^^^
|
||||
error: aborting due to 2 previous errors
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/issue-10536.rs:14:13
|
||||
|
|
||||
LL | assert!({one! two()});
|
||||
| ^^^^^^^^^^^^ expected bool, found ()
|
||||
|
|
||||
= note: expected type `bool`
|
||||
found type `()`
|
||||
|
||||
error: aborting due to 4 previous errors
|
||||
|
||||
For more information about this error, try `rustc --explain E0308`.
|
||||
|
|
|
|||
|
|
@ -1,3 +1,3 @@
|
|||
fn main() {
|
||||
foo! bar < //~ ERROR expected `(` or `{`, found `<`
|
||||
foo! bar < //~ ERROR expected open delimiter
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,8 +1,8 @@
|
|||
error: expected `(` or `{`, found `<`
|
||||
--> $DIR/macro-bad-delimiter-ident.rs:2:14
|
||||
error: expected open delimiter
|
||||
--> $DIR/macro-bad-delimiter-ident.rs:2:10
|
||||
|
|
||||
LL | foo! bar <
|
||||
| ^ expected `(` or `{`
|
||||
| ^^^ expected open delimiter
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
|
|
|
|||
|
|
@ -1,5 +1,9 @@
|
|||
#![allow(unused_macros)]
|
||||
// check-pass
|
||||
|
||||
macro_rules! macro_rules { () => {} } //~ ERROR user-defined macros may not be named `macro_rules`
|
||||
macro_rules! macro_rules { () => { struct S; } } // OK
|
||||
|
||||
fn main() {}
|
||||
macro_rules! {} // OK, calls the macro defined above
|
||||
|
||||
fn main() {
|
||||
let s = S;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,8 +0,0 @@
|
|||
error: user-defined macros may not be named `macro_rules`
|
||||
--> $DIR/user-defined-macro-rules.rs:3:1
|
||||
|
|
||||
LL | macro_rules! macro_rules { () => {} }
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
Loading…
Reference in New Issue