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Rollup merge of #122752 - nnethercote:Interpolated-cleanups, r=petrochenkov

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Interpolated cleanups

Various cleanups I made while working on attempts to remove `Interpolated`, that are worth merging now. Best reviewed one commit at a time.

r? `@petrochenkov`
This commit is contained in:
Matthias Krüger 2024-03-21 17:46:49 +01:00 committed by GitHub
commit 8b132109c4
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GPG Key ID: B5690EEEBB952194
17 changed files with 129 additions and 138 deletions
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6
compiler/rustc_ast/src/token.rs
View File

@ -105,7 +105,7 @@ impl Lit {
}
}
/// Keep this in sync with `Token::can_begin_literal_or_bool` excluding unary negation.
/// Keep this in sync with `Token::can_begin_literal_maybe_minus` excluding unary negation.
pub fn from_token(token: &Token) -> Option<Lit> {
match token.uninterpolate().kind {
Ident(name, IdentIsRaw::No) if name.is_bool_lit() => Some(Lit::new(Bool, name, None)),
@ -664,7 +664,7 @@ impl Token {
}
/// Returns `true` if the token is an interpolated path.
fn is_path(&self) -> bool {
fn is_whole_path(&self) -> bool {
if let Interpolated(nt) = &self.kind
&& let NtPath(..) = &nt.0
{
@ -710,7 +710,7 @@ impl Token {
pub fn is_path_start(&self) -> bool {
self == &ModSep
|| self.is_qpath_start()
|| self.is_path()
|| self.is_whole_path()
|| self.is_path_segment_keyword()
|| self.is_ident() && !self.is_reserved_ident()
}

13
compiler/rustc_ast/src/tokenstream.rs
View File

@ -28,18 +28,7 @@ use smallvec::{smallvec, SmallVec};
use std::borrow::Cow;
use std::{cmp, fmt, iter};
/// When the main Rust parser encounters a syntax-extension invocation, it
/// parses the arguments to the invocation as a token tree. This is a very
/// loose structure, such that all sorts of different AST fragments can
/// be passed to syntax extensions using a uniform type.
///
/// If the syntax extension is an MBE macro, it will attempt to match its
/// LHS token tree against the provided token tree, and if it finds a
/// match, will transcribe the RHS token tree, splicing in any captured
/// `macro_parser::matched_nonterminals` into the `SubstNt`s it finds.
///
/// The RHS of an MBE macro is the only place `SubstNt`s are substituted.
/// Nothing special happens to misnamed or misplaced `SubstNt`s.
/// Part of a `TokenStream`.
#[derive(Debug, Clone, PartialEq, Encodable, Decodable, HashStable_Generic)]
pub enum TokenTree {
/// A single token. Should never be `OpenDelim` or `CloseDelim`, because

17
compiler/rustc_expand/src/mbe/macro_parser.rs
View File

@ -392,12 +392,7 @@ pub(super) fn count_metavar_decls(matcher: &[TokenTree]) -> usize {
#[derive(Debug, Clone)]
pub(crate) enum NamedMatch {
MatchedSeq(Vec<NamedMatch>),
// A metavar match of type `tt`.
MatchedTokenTree(rustc_ast::tokenstream::TokenTree),
// A metavar match of any type other than `tt`.
MatchedNonterminal(Lrc<(Nonterminal, rustc_span::Span)>),
MatchedSingle(ParseNtResult<Lrc<(Nonterminal, Span)>>),
}
/// Performs a token equality check, ignoring syntax context (that is, an unhygienic comparison)
@ -691,11 +686,11 @@ impl TtParser {
}
Ok(nt) => nt,
};
let m = match nt {
ParseNtResult::Nt(nt) => MatchedNonterminal(Lrc::new((nt, span))),
ParseNtResult::Tt(tt) => MatchedTokenTree(tt),
};
mp.push_match(next_metavar, seq_depth, m);
mp.push_match(
next_metavar,
seq_depth,
MatchedSingle(nt.map_nt(|nt| (Lrc::new((nt, span))))),
);
mp.idx += 1;
} else {
unreachable!()

8
compiler/rustc_expand/src/mbe/macro_rules.rs
View File

@ -5,7 +5,7 @@ use crate::mbe;
use crate::mbe::diagnostics::{annotate_doc_comment, parse_failure_msg};
use crate::mbe::macro_check;
use crate::mbe::macro_parser::{Error, ErrorReported, Failure, Success, TtParser};
use crate::mbe::macro_parser::{MatchedSeq, MatchedTokenTree, MatcherLoc};
use crate::mbe::macro_parser::{MatcherLoc, NamedMatch::*};
use crate::mbe::transcribe::transcribe;
use ast::token::IdentIsRaw;
@ -22,7 +22,7 @@ use rustc_lint_defs::builtin::{
RUST_2021_INCOMPATIBLE_OR_PATTERNS, SEMICOLON_IN_EXPRESSIONS_FROM_MACROS,
};
use rustc_lint_defs::BuiltinLintDiag;
use rustc_parse::parser::{Parser, Recovery};
use rustc_parse::parser::{ParseNtResult, Parser, Recovery};
use rustc_session::parse::ParseSess;
use rustc_session::Session;
use rustc_span::edition::Edition;
@ -479,7 +479,7 @@ pub fn compile_declarative_macro(
MatchedSeq(s) => s
.iter()
.map(|m| {
if let MatchedTokenTree(tt) = m {
if let MatchedSingle(ParseNtResult::Tt(tt)) = m {
let tt = mbe::quoted::parse(
&TokenStream::new(vec![tt.clone()]),
true,
@ -505,7 +505,7 @@ pub fn compile_declarative_macro(
MatchedSeq(s) => s
.iter()
.map(|m| {
if let MatchedTokenTree(tt) = m {
if let MatchedSingle(ParseNtResult::Tt(tt)) = m {
return mbe::quoted::parse(
&TokenStream::new(vec![tt.clone()]),
false,

31
compiler/rustc_expand/src/mbe/transcribe.rs
View File

@ -3,14 +3,14 @@ use crate::errors::{
CountRepetitionMisplaced, MetaVarExprUnrecognizedVar, MetaVarsDifSeqMatchers, MustRepeatOnce,
NoSyntaxVarsExprRepeat, VarStillRepeating,
};
use crate::mbe::macro_parser::{MatchedNonterminal, MatchedSeq, MatchedTokenTree, NamedMatch};
use crate::mbe::macro_parser::{NamedMatch, NamedMatch::*};
use crate::mbe::{self, KleeneOp, MetaVarExpr};
use rustc_ast::mut_visit::{self, MutVisitor};
use rustc_ast::token::{self, Delimiter, Token, TokenKind};
use rustc_ast::tokenstream::{DelimSpacing, DelimSpan, Spacing, TokenStream, TokenTree};
use rustc_data_structures::fx::FxHashMap;
use rustc_errors::Diag;
use rustc_errors::{pluralize, PResult};
use rustc_errors::{pluralize, Diag, PResult};
use rustc_parse::parser::ParseNtResult;
use rustc_span::hygiene::{LocalExpnId, Transparency};
use rustc_span::symbol::{sym, Ident, MacroRulesNormalizedIdent};
use rustc_span::{with_metavar_spans, Span, SyntaxContext};
@ -250,26 +250,25 @@ pub(super) fn transcribe<'a>(
// the meta-var.
let ident = MacroRulesNormalizedIdent::new(original_ident);
if let Some(cur_matched) = lookup_cur_matched(ident, interp, &repeats) {
match cur_matched {
MatchedTokenTree(tt) => {
let tt = match cur_matched {
MatchedSingle(ParseNtResult::Tt(tt)) => {
// `tt`s are emitted into the output stream directly as "raw tokens",
// without wrapping them into groups.
let tt = maybe_use_metavar_location(cx, &stack, sp, tt, &mut marker);
result.push(tt);
maybe_use_metavar_location(cx, &stack, sp, tt, &mut marker)
}
MatchedNonterminal(nt) => {
MatchedSingle(ParseNtResult::Nt(nt)) => {
// Other variables are emitted into the output stream as groups with
// `Delimiter::Invisible` to maintain parsing priorities.
// `Interpolated` is currently used for such groups in rustc parser.
marker.visit_span(&mut sp);
result
.push(TokenTree::token_alone(token::Interpolated(nt.clone()), sp));
TokenTree::token_alone(token::Interpolated(nt.clone()), sp)
}
MatchedSeq(..) => {
// We were unable to descend far enough. This is an error.
return Err(cx.dcx().create_err(VarStillRepeating { span: sp, ident }));
}
}
};
result.push(tt)
} else {
// If we aren't able to match the meta-var, we push it back into the result but
// with modified syntax context. (I believe this supports nested macros).
@ -424,7 +423,7 @@ fn lookup_cur_matched<'a>(
interpolations.get(&ident).map(|mut matched| {
for &(idx, _) in repeats {
match matched {
MatchedTokenTree(_) | MatchedNonterminal(_) => break,
MatchedSingle(_) => break,
MatchedSeq(ads) => matched = ads.get(idx).unwrap(),
}
}
@ -514,7 +513,7 @@ fn lockstep_iter_size(
let name = MacroRulesNormalizedIdent::new(*name);
match lookup_cur_matched(name, interpolations, repeats) {
Some(matched) => match matched {
MatchedTokenTree(_) | MatchedNonterminal(_) => LockstepIterSize::Unconstrained,
MatchedSingle(_) => LockstepIterSize::Unconstrained,
MatchedSeq(ads) => LockstepIterSize::Constraint(ads.len(), name),
},
_ => LockstepIterSize::Unconstrained,
@ -557,7 +556,7 @@ fn count_repetitions<'a>(
// (or at the top-level of `matched` if no depth is given).
fn count<'a>(depth_curr: usize, depth_max: usize, matched: &NamedMatch) -> PResult<'a, usize> {
match matched {
MatchedTokenTree(_) | MatchedNonterminal(_) => Ok(1),
MatchedSingle(_) => Ok(1),
MatchedSeq(named_matches) => {
if depth_curr == depth_max {
Ok(named_matches.len())
@ -571,7 +570,7 @@ fn count_repetitions<'a>(
/// Maximum depth
fn depth(counter: usize, matched: &NamedMatch) -> usize {
match matched {
MatchedTokenTree(_) | MatchedNonterminal(_) => counter,
MatchedSingle(_) => counter,
MatchedSeq(named_matches) => {
let rslt = counter + 1;
if let Some(elem) = named_matches.first() { depth(rslt, elem) } else { rslt }
@ -599,7 +598,7 @@ fn count_repetitions<'a>(
}
}
if let MatchedTokenTree(_) | MatchedNonterminal(_) = matched {
if let MatchedSingle(_) = matched {
return Err(cx.dcx().create_err(CountRepetitionMisplaced { span: sp.entire() }));
}

2
compiler/rustc_parse/messages.ftl
View File

@ -390,8 +390,6 @@ parse_invalid_dyn_keyword = invalid `dyn` keyword
parse_invalid_expression_in_let_else = a `{$operator}` expression cannot be directly assigned in `let...else`
parse_invalid_identifier_with_leading_number = identifiers cannot start with a number
parse_invalid_interpolated_expression = invalid interpolated expression
parse_invalid_literal_suffix_on_tuple_index = suffixes on a tuple index are invalid
.label = invalid suffix `{$suffix}`
.tuple_exception_line_1 = `{$suffix}` is *temporarily* accepted on tuple index fields as it was incorrectly accepted on stable for a few releases

7
compiler/rustc_parse/src/errors.rs
View File

@ -850,13 +850,6 @@ pub(crate) struct StructLiteralNotAllowedHereSugg {
pub right: Span,
}
#[derive(Diagnostic)]
#[diag(parse_invalid_interpolated_expression)]
pub(crate) struct InvalidInterpolatedExpression {
#[primary_span]
pub span: Span,
}
#[derive(Diagnostic)]
#[diag(parse_invalid_literal_suffix_on_tuple_index)]
pub(crate) struct InvalidLiteralSuffixOnTupleIndex {

47
compiler/rustc_parse/src/parser/attr.rs
View File

@ -3,11 +3,12 @@ use crate::errors::{
SuffixedLiteralInAttribute,
};
use crate::fluent_generated as fluent;
use crate::maybe_whole;
use super::{AttrWrapper, Capturing, FnParseMode, ForceCollect, Parser, PathStyle};
use rustc_ast as ast;
use rustc_ast::attr;
use rustc_ast::token::{self, Delimiter, Nonterminal};
use rustc_ast::token::{self, Delimiter};
use rustc_errors::{codes::*, Diag, PResult};
use rustc_span::{sym, BytePos, Span};
use thin_vec::ThinVec;
@ -251,25 +252,15 @@ impl<'a> Parser<'a> {
/// PATH `=` UNSUFFIXED_LIT
/// The delimiters or `=` are still put into the resulting token stream.
pub fn parse_attr_item(&mut self, capture_tokens: bool) -> PResult<'a, ast::AttrItem> {
let item = match &self.token.kind {
token::Interpolated(nt) => match &nt.0 {
Nonterminal::NtMeta(item) => Some(item.clone().into_inner()),
_ => None,
},
_ => None,
maybe_whole!(self, NtMeta, |attr| attr.into_inner());
let do_parse = |this: &mut Self| {
let path = this.parse_path(PathStyle::Mod)?;
let args = this.parse_attr_args()?;
Ok(ast::AttrItem { path, args, tokens: None })
};
Ok(if let Some(item) = item {
self.bump();
item
} else {
let do_parse = |this: &mut Self| {
let path = this.parse_path(PathStyle::Mod)?;
let args = this.parse_attr_args()?;
Ok(ast::AttrItem { path, args, tokens: None })
};
// Attr items don't have attributes
if capture_tokens { self.collect_tokens_no_attrs(do_parse) } else { do_parse(self) }?
})
// Attr items don't have attributes
if capture_tokens { self.collect_tokens_no_attrs(do_parse) } else { do_parse(self) }
}
/// Parses attributes that appear after the opening of an item. These should
@ -371,22 +362,18 @@ impl<'a> Parser<'a> {
/// meta_item_inner : (meta_item | UNSUFFIXED_LIT) (',' meta_item_inner)? ;
/// ```
pub fn parse_meta_item(&mut self) -> PResult<'a, ast::MetaItem> {
let nt_meta = match &self.token.kind {
token::Interpolated(nt) => match &nt.0 {
token::NtMeta(e) => Some(e.clone()),
_ => None,
},
_ => None,
};
if let Some(item) = nt_meta {
match item.meta(item.path.span) {
// We can't use `maybe_whole` here because it would bump in the `None`
// case, which we don't want.
if let token::Interpolated(nt) = &self.token.kind
&& let token::NtMeta(attr_item) = &nt.0
{
match attr_item.meta(attr_item.path.span) {
Some(meta) => {
self.bump();
return Ok(meta);
}
None => self.unexpected()?,
};
}
}
let lo = self.token.span;

10
compiler/rustc_parse/src/parser/expr.rs
View File

@ -2053,16 +2053,6 @@ impl<'a> Parser<'a> {
&mut self,
mk_lit_char: impl FnOnce(Symbol, Span) -> L,
) -> PResult<'a, L> {
if let token::Interpolated(nt) = &self.token.kind
&& let token::NtExpr(e) | token::NtLiteral(e) = &nt.0
&& matches!(e.kind, ExprKind::Err(_))
{
let mut err = self
.dcx()
.create_err(errors::InvalidInterpolatedExpression { span: self.token.span });
err.downgrade_to_delayed_bug();
return Err(err);
}
let token = self.token.clone();
let err = |self_: &Self| {
let msg = format!("unexpected token: {}", super::token_descr(&token));

14
compiler/rustc_parse/src/parser/item.rs
View File

@ -6,6 +6,7 @@ use super::{
};
use crate::errors::{self, MacroExpandsToAdtField};
use crate::fluent_generated as fluent;
use crate::maybe_whole;
use ast::token::IdentIsRaw;
use rustc_ast::ast::*;
use rustc_ast::ptr::P;
@ -115,17 +116,10 @@ impl<'a> Parser<'a> {
fn_parse_mode: FnParseMode,
force_collect: ForceCollect,
) -> PResult<'a, Option<Item>> {
// Don't use `maybe_whole` so that we have precise control
// over when we bump the parser
if let token::Interpolated(nt) = &self.token.kind
&& let token::NtItem(item) = &nt.0
{
let mut item = item.clone();
self.bump();
maybe_whole!(self, NtItem, |item| {
attrs.prepend_to_nt_inner(&mut item.attrs);
return Ok(Some(item.into_inner()));
};
Some(item.into_inner())
});
let item =
self.collect_tokens_trailing_token(attrs, force_collect, |this: &mut Self, attrs| {

36
compiler/rustc_parse/src/parser/mod.rs
View File

@ -20,7 +20,7 @@ pub use pat::{CommaRecoveryMode, RecoverColon, RecoverComma};
pub use path::PathStyle;
use rustc_ast::ptr::P;
use rustc_ast::token::{self, Delimiter, Nonterminal, Token, TokenKind};
use rustc_ast::token::{self, Delimiter, Token, TokenKind};
use rustc_ast::tokenstream::{AttributesData, DelimSpacing, DelimSpan, Spacing};
use rustc_ast::tokenstream::{TokenStream, TokenTree, TokenTreeCursor};
use rustc_ast::util::case::Case;
@ -93,12 +93,13 @@ pub enum TrailingToken {
#[macro_export]
macro_rules! maybe_whole {
($p:expr, $constructor:ident, |$x:ident| $e:expr) => {
if let token::Interpolated(nt) = &$p.token.kind {
if let token::$constructor(x) = &nt.0 {
let $x = x.clone();
$p.bump();
return Ok($e);
}
if let token::Interpolated(nt) = &$p.token.kind
&& let token::$constructor(x) = &nt.0
{
#[allow(unused_mut)]
let mut $x = x.clone();
$p.bump();
return Ok($e);
}
};
}
@ -1407,7 +1408,7 @@ impl<'a> Parser<'a> {
/// so emit a proper diagnostic.
// Public for rustfmt usage.
pub fn parse_visibility(&mut self, fbt: FollowedByType) -> PResult<'a, Visibility> {
maybe_whole!(self, NtVis, |x| x.into_inner());
maybe_whole!(self, NtVis, |vis| vis.into_inner());
if !self.eat_keyword(kw::Pub) {
// We need a span for our `Spanned<VisibilityKind>`, but there's inherently no
@ -1584,8 +1585,21 @@ pub enum FlatToken {
Empty,
}
#[derive(Debug)]
pub enum ParseNtResult {
Nt(Nonterminal),
// Metavar captures of various kinds.
#[derive(Clone, Debug)]
pub enum ParseNtResult<NtType> {
Tt(TokenTree),
Nt(NtType),
}
impl<T> ParseNtResult<T> {
pub fn map_nt<F, U>(self, mut f: F) -> ParseNtResult<U>
where
F: FnMut(T) -> U,
{
match self {
ParseNtResult::Tt(tt) => ParseNtResult::Tt(tt),
ParseNtResult::Nt(nt) => ParseNtResult::Nt(f(nt)),
}
}
}

15
compiler/rustc_parse/src/parser/nonterminal.rs
View File

@ -1,5 +1,5 @@
use rustc_ast::ptr::P;
use rustc_ast::token::{self, Delimiter, Nonterminal::*, NonterminalKind, Token};
use rustc_ast::token::{self, Delimiter, Nonterminal, Nonterminal::*, NonterminalKind, Token};
use rustc_ast::HasTokens;
use rustc_ast_pretty::pprust;
use rustc_errors::PResult;
@ -66,15 +66,14 @@ impl<'a> Parser<'a> {
token::Interpolated(nt) => may_be_ident(&nt.0),
_ => false,
},
NonterminalKind::PatParam { .. } | NonterminalKind::PatWithOr => {
match &token.kind {
NonterminalKind::PatParam { .. } | NonterminalKind::PatWithOr => match &token.kind {
token::Ident(..) | // box, ref, mut, and other identifiers (can stricten)
token::OpenDelim(Delimiter::Parenthesis) | // tuple pattern
token::OpenDelim(Delimiter::Bracket) | // slice pattern
token::BinOp(token::And) | // reference
token::BinOp(token::Minus) | // negative literal
token::AndAnd | // double reference
token::Literal(_) | // literal
token::Literal(_) | // literal
token::DotDot | // range pattern (future compat)
token::DotDotDot | // range pattern (future compat)
token::ModSep | // path
@ -84,8 +83,7 @@ impl<'a> Parser<'a> {
token::BinOp(token::Or) => matches!(kind, NonterminalKind::PatWithOr),
token::Interpolated(nt) => may_be_ident(&nt.0),
_ => false,
}
}
},
NonterminalKind::Lifetime => match &token.kind {
token::Lifetime(_) => true,
token::Interpolated(nt) => {
@ -102,7 +100,10 @@ impl<'a> Parser<'a> {
/// Parse a non-terminal (e.g. MBE `:pat` or `:ident`). Inlined because there is only one call
/// site.
#[inline]
pub fn parse_nonterminal(&mut self, kind: NonterminalKind) -> PResult<'a, ParseNtResult> {
pub fn parse_nonterminal(
&mut self,
kind: NonterminalKind,
) -> PResult<'a, ParseNtResult<Nonterminal>> {
// A `macro_rules!` invocation may pass a captured item/expr to a proc-macro,
// which requires having captured tokens available. Since we cannot determine
// in advance whether or not a proc-macro will be (transitively) invoked,

2
compiler/rustc_parse/src/parser/pat.rs
View File

@ -435,7 +435,7 @@ impl<'a> Parser<'a> {
syntax_loc: Option<PatternLocation>,
) -> PResult<'a, P<Pat>> {
maybe_recover_from_interpolated_ty_qpath!(self, true);
maybe_whole!(self, NtPat, |x| x);
maybe_whole!(self, NtPat, |pat| pat);
let mut lo = self.token.span;

20
compiler/rustc_parse/src/parser/stmt.rs
View File

@ -40,8 +40,8 @@ impl<'a> Parser<'a> {
}))
}
/// If `force_collect` is [`ForceCollect::Yes`], forces collection of tokens regardless of whether
/// or not we have attributes
/// If `force_collect` is [`ForceCollect::Yes`], forces collection of tokens regardless of
/// whether or not we have attributes.
// Public for `cfg_eval` macro expansion.
pub fn parse_stmt_without_recovery(
&mut self,
@ -51,18 +51,12 @@ impl<'a> Parser<'a> {
let attrs = self.parse_outer_attributes()?;
let lo = self.token.span;
// Don't use `maybe_whole` so that we have precise control
// over when we bump the parser
if let token::Interpolated(nt) = &self.token.kind
&& let token::NtStmt(stmt) = &nt.0
{
let mut stmt = stmt.clone();
self.bump();
maybe_whole!(self, NtStmt, |stmt| {
stmt.visit_attrs(|stmt_attrs| {
attrs.prepend_to_nt_inner(stmt_attrs);
});
return Ok(Some(stmt.into_inner()));
}
Some(stmt.into_inner())
});
if self.token.is_keyword(kw::Mut) && self.is_keyword_ahead(1, &[kw::Let]) {
self.bump();
@ -539,7 +533,7 @@ impl<'a> Parser<'a> {
blk_mode: BlockCheckMode,
can_be_struct_literal: bool,
) -> PResult<'a, (AttrVec, P<Block>)> {
maybe_whole!(self, NtBlock, |x| (AttrVec::new(), x));
maybe_whole!(self, NtBlock, |block| (AttrVec::new(), block));
let maybe_ident = self.prev_token.clone();
self.maybe_recover_unexpected_block_label();
@ -643,7 +637,7 @@ impl<'a> Parser<'a> {
recover: AttemptLocalParseRecovery,
) -> PResult<'a, Option<Stmt>> {
// Skip looking for a trailing semicolon when we have an interpolated statement.
maybe_whole!(self, NtStmt, |x| Some(x.into_inner()));
maybe_whole!(self, NtStmt, |stmt| Some(stmt.into_inner()));
let Some(mut stmt) = self.parse_stmt_without_recovery(true, ForceCollect::No)? else {
return Ok(None);

2
compiler/rustc_parse/src/parser/ty.rs
View File

@ -250,7 +250,7 @@ impl<'a> Parser<'a> {
) -> PResult<'a, P<Ty>> {
let allow_qpath_recovery = recover_qpath == RecoverQPath::Yes;
maybe_recover_from_interpolated_ty_qpath!(self, allow_qpath_recovery);
maybe_whole!(self, NtTy, |x| x);
maybe_whole!(self, NtTy, |ty| ty);
let lo = self.token.span;
let mut impl_dyn_multi = false;

12
tests/ui/parser/attribute/attr-bad-meta-4.rs Normal file
View File

@ -0,0 +1,12 @@
macro_rules! mac {
($attr_item: meta) => {
#[cfg($attr_item)]
//~^ ERROR expected unsuffixed literal or identifier, found `an(arbitrary token stream)`
//~| ERROR expected unsuffixed literal or identifier, found `an(arbitrary token stream)`
struct S;
}
}
mac!(an(arbitrary token stream));
fn main() {}

25
tests/ui/parser/attribute/attr-bad-meta-4.stderr Normal file
View File

@ -0,0 +1,25 @@
error: expected unsuffixed literal or identifier, found `an(arbitrary token stream)`
--> $DIR/attr-bad-meta-4.rs:3:15
|
LL | #[cfg($attr_item)]
| ^^^^^^^^^^
...
LL | mac!(an(arbitrary token stream));
| -------------------------------- in this macro invocation
|
= note: this error originates in the macro `mac` (in Nightly builds, run with -Z macro-backtrace for more info)
error: expected unsuffixed literal or identifier, found `an(arbitrary token stream)`
--> $DIR/attr-bad-meta-4.rs:3:15
|
LL | #[cfg($attr_item)]
| ^^^^^^^^^^
...
LL | mac!(an(arbitrary token stream));
| -------------------------------- in this macro invocation
|
= note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
= note: this error originates in the macro `mac` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 2 previous errors