Make parse_seq_to_before_tokens take expected/nonexpected tokens, use in parse_precise_capturing_syntax

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -1,7 +1,6 @@
 use super::pat::Expected;
 use super::{
-    BlockMode, CommaRecoveryMode, Parser, PathStyle, Restrictions, SemiColonMode, SeqSep,
+    BlockMode, CommaRecoveryMode, Parser, PathStyle, Restrictions, SemiColonMode, SeqSep, TokenType,
-    TokenExpectType, TokenType,
 };
 use crate::errors::{
     AmbiguousPlus, AsyncMoveBlockIn2015, AttributeOnParamType, BadQPathStage2, BadTypePlus,
@@ -1045,9 +1044,7 @@ pub(super) fn recover_closure_body(
     /// passes through any errors encountered. Used for error recovery.
     pub(super) fn eat_to_tokens(&mut self, kets: &[&TokenKind]) {
         if let Err(err) =
-            self.parse_seq_to_before_tokens(kets, SeqSep::none(), TokenExpectType::Expect, |p| {
+            self.parse_seq_to_before_tokens(kets, &[], SeqSep::none(), |p| Ok(p.parse_token_tree()))
-                Ok(p.parse_token_tree())
-            })
         {
             err.cancel();
         }

compiler/rustc_parse/src/parser/expr.rs

@@ -4,7 +4,7 @@
 use super::ty::{AllowPlus, RecoverQPath, RecoverReturnSign};
 use super::{
     AttrWrapper, BlockMode, ClosureSpans, ForceCollect, Parser, PathStyle, Restrictions,
-    SemiColonMode, SeqSep, TokenExpectType, TokenType, Trailing, TrailingToken,
+    SemiColonMode, SeqSep, TokenType, Trailing, TrailingToken,
 };
 
 use crate::errors;
@@ -2456,9 +2456,9 @@ fn parse_fn_block_decl(&mut self) -> PResult<'a, (P<FnDecl>, Span)> {
             self.expect(&token::BinOp(token::Or))?;
             let args = self
                 .parse_seq_to_before_tokens(
-                    &[&token::BinOp(token::Or), &token::OrOr],
+                    &[&token::BinOp(token::Or)],
+                    &[&token::OrOr],
                     SeqSep::trailing_allowed(token::Comma),
-                    TokenExpectType::NoExpect,
                     |p| p.parse_fn_block_param(),
                 )?
                 .0;

compiler/rustc_parse/src/parser/mod.rs

@@ -335,18 +335,6 @@ fn to_string(&self) -> String {
     }
 }
 
-/// Used by [`Parser::expect_any_with_type`].
-#[derive(Copy, Clone, Debug)]
-enum TokenExpectType {
-    /// Unencountered tokens are inserted into [`Parser::expected_tokens`].
-    /// See [`Parser::check`].
-    Expect,
-
-    /// Unencountered tokens are not inserted into [`Parser::expected_tokens`].
-    /// See [`Parser::check_noexpect`].
-    NoExpect,
-}
-
 /// A sequence separator.
 #[derive(Debug)]
 struct SeqSep {
@@ -807,11 +795,13 @@ fn expect_gt(&mut self) -> PResult<'a, ()> {
     }
 
     /// Checks if the next token is contained within `kets`, and returns `true` if so.
-    fn expect_any_with_type(&mut self, kets: &[&TokenKind], expect: TokenExpectType) -> bool {
+    fn expect_any_with_type(
-        kets.iter().any(|k| match expect {
+        &mut self,
-            TokenExpectType::Expect => self.check(k),
+        kets_expected: &[&TokenKind],
-            TokenExpectType::NoExpect => self.check_noexpect(k),
+        kets_not_expected: &[&TokenKind],
-        })
+    ) -> bool {
+        kets_expected.iter().any(|k| self.check(k))
+            || kets_not_expected.iter().any(|k| self.check_noexpect(k))
     }
 
     /// Parses a sequence until the specified delimiters. The function
@@ -819,9 +809,9 @@ fn expect_any_with_type(&mut self, kets: &[&TokenKind], expect: TokenExpectType)
     /// closing bracket.
     fn parse_seq_to_before_tokens<T>(
         &mut self,
-        kets: &[&TokenKind],
+        kets_expected: &[&TokenKind],
+        kets_not_expected: &[&TokenKind],
         sep: SeqSep,
-        expect: TokenExpectType,
         mut f: impl FnMut(&mut Parser<'a>) -> PResult<'a, T>,
     ) -> PResult<'a, (ThinVec<T>, Trailing, Recovered)> {
         let mut first = true;
@@ -829,7 +819,7 @@ fn parse_seq_to_before_tokens<T>(
         let mut trailing = Trailing::No;
         let mut v = ThinVec::new();
 
-        while !self.expect_any_with_type(kets, expect) {
+        while !self.expect_any_with_type(kets_expected, kets_not_expected) {
             if let token::CloseDelim(..) | token::Eof = self.token.kind {
                 break;
             }
@@ -927,7 +917,8 @@ fn parse_seq_to_before_tokens<T>(
                                     if self.token == token::Colon {
                                         // we will try to recover in `maybe_recover_struct_lit_bad_delims`
                                         return Err(expect_err);
-                                    } else if let [token::CloseDelim(Delimiter::Parenthesis)] = kets
+                                    } else if let [token::CloseDelim(Delimiter::Parenthesis)] =
+                                        kets_expected
                                     {
                                         return Err(expect_err);
                                     } else {
@@ -940,7 +931,9 @@ fn parse_seq_to_before_tokens<T>(
                     }
                 }
             }
-            if sep.trailing_sep_allowed && self.expect_any_with_type(kets, expect) {
+            if sep.trailing_sep_allowed
+                && self.expect_any_with_type(kets_expected, kets_not_expected)
+            {
                 trailing = Trailing::Yes;
                 break;
             }
@@ -1020,7 +1013,7 @@ fn parse_seq_to_before_end<T>(
         sep: SeqSep,
         f: impl FnMut(&mut Parser<'a>) -> PResult<'a, T>,
     ) -> PResult<'a, (ThinVec<T>, Trailing, Recovered)> {
-        self.parse_seq_to_before_tokens(&[ket], sep, TokenExpectType::Expect, f)
+        self.parse_seq_to_before_tokens(&[ket], &[], sep, f)
     }
 
     /// Parses a sequence, including only the closing delimiter. The function

compiler/rustc_parse/src/parser/ty.rs

@@ -9,7 +9,7 @@
 use crate::{maybe_recover_from_interpolated_ty_qpath, maybe_whole};
 
 use rustc_ast::ptr::P;
-use rustc_ast::token::{self, Delimiter, Token, TokenKind};
+use rustc_ast::token::{self, BinOpToken, Delimiter, Token, TokenKind};
 use rustc_ast::util::case::Case;
 use rustc_ast::{
     self as ast, BareFnTy, BoundAsyncness, BoundConstness, BoundPolarity, FnRetTy, GenericBound,
@@ -694,9 +694,14 @@ fn parse_precise_capturing_args(
         &mut self,
     ) -> PResult<'a, (ThinVec<PreciseCapturingArg>, Span)> {
         let lo = self.token.span;
-        let (args, _) = self.parse_unspanned_seq(
+        self.expect_lt()?;
-            &TokenKind::Lt,
+        let (args, _, _) = self.parse_seq_to_before_tokens(
-            &TokenKind::Gt,
+            &[&TokenKind::Gt],
+            &[
+                &TokenKind::Ge,
+                &TokenKind::BinOp(BinOpToken::Shr),
+                &TokenKind::BinOpEq(BinOpToken::Shr),
+            ],
             SeqSep::trailing_allowed(token::Comma),
             |self_| {
                 if self_.check_keyword(kw::SelfUpper) {
@@ -717,6 +722,7 @@ fn parse_precise_capturing_args(
                 }
             },
         )?;
+        self.expect_gt()?;
         Ok((args, lo.to(self.prev_token.span)))
     }
 

tests/ui/impl-trait/precise-capturing/unexpected-token.rs

@@ -4,6 +4,5 @@
 
 fn hello() -> impl use<'a {}> Sized {}
 //~^ ERROR expected one of `,` or `>`, found `{`
-//~| ERROR expected item, found `>`
 
 fn main() {}

tests/ui/impl-trait/precise-capturing/unexpected-token.stderr

@@ -4,13 +4,5 @@ error: expected one of `,` or `>`, found `{`
 LL | fn hello() -> impl use<'a {}> Sized {}
    |                           ^ expected one of `,` or `>`
 
-error: expected item, found `>`
+error: aborting due to 1 previous error
-  --> $DIR/unexpected-token.rs:5:29
-   |
-LL | fn hello() -> impl use<'a {}> Sized {}
-   |                             ^ expected item
-   |
-   = note: for a full list of items that can appear in modules, see <https://doc.rust-lang.org/reference/items.html>
-
-error: aborting due to 2 previous errors
 

tests/ui/issues/issue-66706.rs

@@ -1,6 +1,6 @@
 fn a() {
     [0; [|_: _ &_| ()].len()]
-    //~^ ERROR expected `,`, found `&`
+    //~^ ERROR expected one of `,` or `|`, found `&`
     //~| ERROR type annotations needed
 }
 
@@ -11,7 +11,7 @@ fn b() {
 
 fn c() {
     [0; [|&_: _ &_| {}; 0 ].len()]
-    //~^ ERROR expected `,`, found `&`
+    //~^ ERROR expected one of `,` or `|`, found `&`
     //~| ERROR type annotations needed
 }
 

tests/ui/issues/issue-66706.stderr

@@ -1,8 +1,8 @@
-error: expected `,`, found `&`
+error: expected one of `,` or `|`, found `&`
   --> $DIR/issue-66706.rs:2:16
    |
 LL |     [0; [|_: _ &_| ()].len()]
-   |               -^ expected `,`
+   |               -^ expected one of `,` or `|`
    |               |
    |               help: missing `,`
 
@@ -12,11 +12,11 @@ error: expected identifier, found reserved identifier `_`
 LL |     [0; [|f @ &ref _| {} ; 0 ].len() ];
    |                    ^ expected identifier, found reserved identifier
 
-error: expected `,`, found `&`
+error: expected one of `,` or `|`, found `&`
   --> $DIR/issue-66706.rs:13:17
    |
 LL |     [0; [|&_: _ &_| {}; 0 ].len()]
-   |                -^ expected `,`
+   |                -^ expected one of `,` or `|`
    |                |
    |                help: missing `,`