delay the bug once again, generalize turbofish suggestion

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -731,28 +731,22 @@ impl<'a> Parser<'a> {
                     match x {
                         Ok((_, _, false)) => {
                             if self.eat(&token::Gt) {
-                                let turbo_err = e.span_suggestion_verbose(
+                                e.span_suggestion_verbose(
                                     binop.span.shrink_to_lo(),
                                     TURBOFISH_SUGGESTION_STR,
                                     "::".to_string(),
                                     Applicability::MaybeIncorrect,
-                                );
+                                )
-                                if matches!(self.token.kind, token::Semi | token::CloseDelim(_)) {
+                                .emit();
-                                    turbo_err.emit();
+                                match self.parse_expr() {
-                                    *expr = self.mk_expr_err(expr.span);
+                                    Ok(_) => {
-                                    return Ok(());
+                                        *expr =
-                                } else {
+                                            self.mk_expr_err(expr.span.to(self.prev_token.span));
-                                    match self.parse_expr() {
+                                        return Ok(());
-                                        Ok(_) => {
+                                    }
-                                            turbo_err.emit();
+                                    Err(mut err) => {
-                                            *expr = self
+                                        *expr = self.mk_expr_err(expr.span);
-                                                .mk_expr_err(expr.span.to(self.prev_token.span));
+                                        err.cancel();
-                                            return Ok(());
-                                        }
-                                        Err(mut err) => {
-                                            turbo_err.cancel();
-                                            err.cancel();
-                                        }
                                     }
                                 }
                             }

compiler/rustc_parse/src/parser/expr.rs

@@ -1448,8 +1448,6 @@ impl<'a> Parser<'a> {
         let lo = label.ident.span;
         let label = Some(label);
         let ate_colon = self.eat(&token::Colon);
-        let msg = "expected `while`, `for`, `loop` or `{` after a label";
-
         let expr = if self.eat_keyword(kw::While) {
             self.parse_while_expr(label, lo, attrs)
         } else if self.eat_keyword(kw::For) {
@@ -1459,12 +1457,13 @@ impl<'a> Parser<'a> {
         } else if self.check(&token::OpenDelim(token::Brace)) || self.token.is_whole_block() {
             self.parse_block_expr(label, lo, BlockCheckMode::Default, attrs)
         } else if !ate_colon && (self.check(&TokenKind::Comma) || self.check(&TokenKind::Gt)) {
-            self.struct_span_err(self.token.span, msg).span_label(self.token.span, msg).emit();
             // We're probably inside of a `Path<'a>` that needs a turbofish, so suppress the
-            // "must be followed by a colon" error.
+            // "must be followed by a colon" error, and the "expected one of" error.
+            self.diagnostic().delay_span_bug(lo, "this label wasn't parsed correctly");
             consume_colon = false;
             Ok(self.mk_expr_err(lo))
         } else {
+            let msg = "expected `while`, `for`, `loop` or `{` after a label";
             self.struct_span_err(self.token.span, msg).span_label(self.token.span, msg).emit();
             // Continue as an expression in an effort to recover on `'label: non_block_expr`.
             self.parse_expr()

src/test/ui/parser/issues/issue-93282.rs

@@ -1,5 +1,4 @@
 fn main() {
     f<'a,>
     //~^ ERROR expected
-    //~| ERROR expected
 }

src/test/ui/parser/issues/issue-93282.stderr

@@ -1,9 +1,3 @@
-error: expected `while`, `for`, `loop` or `{` after a label
-  --> $DIR/issue-93282.rs:2:9
-   |
-LL |     f<'a,>
-   |         ^ expected `while`, `for`, `loop` or `{` after a label
-
 error: expected one of `.`, `:`, `;`, `?`, `for`, `loop`, `while`, `{`, `}`, or an operator, found `,`
   --> $DIR/issue-93282.rs:2:9
    |
@@ -15,5 +9,5 @@ help: use `::<...>` instead of `<...>` to specify lifetime, type, or const argum
 LL |     f::<'a,>
    |      ++
 
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 

src/test/ui/parser/require-parens-for-chained-comparison.rs

@@ -21,12 +21,10 @@ fn main() {
 
     let _ = f<'_, i8>();
     //~^ ERROR expected one of
-    //~| ERROR expected
     //~| HELP use `::<...>` instead of `<...>` to specify lifetime, type, or const arguments
 
     f<'_>();
     //~^ comparison operators cannot be chained
-    //~| ERROR expected
     //~| HELP use `::<...>` instead of `<...>` to specify lifetime, type, or const arguments
 
     let _ = f<u8>;

src/test/ui/parser/require-parens-for-chained-comparison.stderr

@@ -53,12 +53,6 @@ help: use `::<...>` instead of `<...>` to specify lifetime, type, or const argum
 LL |     let _ = f::<u8, i8>();
    |              ++
 
-error: expected `while`, `for`, `loop` or `{` after a label
-  --> $DIR/require-parens-for-chained-comparison.rs:22:17
-   |
-LL |     let _ = f<'_, i8>();
-   |                 ^ expected `while`, `for`, `loop` or `{` after a label
-
 error: expected one of `.`, `:`, `;`, `?`, `else`, `for`, `loop`, `while`, `{`, or an operator, found `,`
   --> $DIR/require-parens-for-chained-comparison.rs:22:17
    |
@@ -70,14 +64,8 @@ help: use `::<...>` instead of `<...>` to specify lifetime, type, or const argum
 LL |     let _ = f::<'_, i8>();
    |              ++
 
-error: expected `while`, `for`, `loop` or `{` after a label
-  --> $DIR/require-parens-for-chained-comparison.rs:27:9
-   |
-LL |     f<'_>();
-   |         ^ expected `while`, `for`, `loop` or `{` after a label
-
 error: comparison operators cannot be chained
-  --> $DIR/require-parens-for-chained-comparison.rs:27:6
+  --> $DIR/require-parens-for-chained-comparison.rs:26:6
    |
 LL |     f<'_>();
    |      ^  ^
@@ -88,7 +76,7 @@ LL |     f::<'_>();
    |      ++
 
 error: comparison operators cannot be chained
-  --> $DIR/require-parens-for-chained-comparison.rs:32:14
+  --> $DIR/require-parens-for-chained-comparison.rs:30:14
    |
 LL |     let _ = f<u8>;
    |              ^  ^
@@ -96,5 +84,5 @@ LL |     let _ = f<u8>;
    = help: use `::<...>` instead of `<...>` to specify lifetime, type, or const arguments
    = help: or use `(...)` if you meant to specify fn arguments
 
-error: aborting due to 10 previous errors
+error: aborting due to 8 previous errors