parser: emit proper error for gen fn in function pointer types

[ImadRedwan]

This PR adds a dedicated parser diagnostic for gen fn used in function pointer types.
Previously, such cases resulted in a generic parse error. The new behavior mirrors the
existing handling for async fn, improving consistency and error clarity.

[rustbot]

r? @jackh726

rustbot has assigned @jackh726.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

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[Kivooeo]

why do you put your github account name into commit name

also please squash all commits into one, there is no reason to keep 6 commits for this fix

[ImadRedwan]

was a mistake 🤦‍♂️🤦‍♂️
Yes you're absolutely right. actually this is my first PR and I was a little confused :(

[Kivooeo]

r? me

also could you add a test somewhere in tests/ui/parser to reflect new beahviour

if you have any questions feel free to ask

[Kivooeo]

i see that you added a new two commits that passed a CI, but could you please consider making this

1. squash all commits into one
2. add a ui test

[rust-log-analyzer]

The job aarch64-gnu-llvm-20-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

diff of stderr:

86 help: remove the `gen` qualifier
87    |
88 LL - pub type T6 = gen fn();
- LL + pub type T6 = "C" fn();
+ LL + pub type T6 = fn();
90    |
91 
92 error: an `fn` pointer type cannot be `gen`

142    |
143 
144 error: an `fn` pointer type cannot be `const`
-   --> $DIR/bad-fn-ptr-qualifier.rs:15:25
+   --> $DIR/bad-fn-ptr-qualifier.rs:18:25
146    |
147 LL | pub type FTT0 = for<'a> const fn();
148    |                         ^^^^^ `const` because of this

155    |
156 
157 error: an `fn` pointer type cannot be `const`
-   --> $DIR/bad-fn-ptr-qualifier.rs:16:25
+   --> $DIR/bad-fn-ptr-qualifier.rs:19:25
159    |
160 LL | pub type FTT1 = for<'a> const extern "C" fn();
161    |                         ^^^^^ `const` because of this

168    |
169 
170 error: an `fn` pointer type cannot be `const`
-   --> $DIR/bad-fn-ptr-qualifier.rs:17:25
+   --> $DIR/bad-fn-ptr-qualifier.rs:20:25
172    |
173 LL | pub type FTT2 = for<'a> const unsafe extern "C" fn();
174    |                         ^^^^^ `const` because of this

181    |
182 
183 error: an `fn` pointer type cannot be `async`
-   --> $DIR/bad-fn-ptr-qualifier.rs:18:25
+   --> $DIR/bad-fn-ptr-qualifier.rs:21:25
185    |
186 LL | pub type FTT3 = for<'a> async fn();
187    |                         ^^^^^ `async` because of this

194    |
195 
196 error: an `fn` pointer type cannot be `async`
-   --> $DIR/bad-fn-ptr-qualifier.rs:19:25
+   --> $DIR/bad-fn-ptr-qualifier.rs:22:25
198    |
199 LL | pub type FTT4 = for<'a> async extern "C" fn();
200    |                         ^^^^^ `async` because of this

207    |
208 
209 error: an `fn` pointer type cannot be `async`
-   --> $DIR/bad-fn-ptr-qualifier.rs:20:25
+   --> $DIR/bad-fn-ptr-qualifier.rs:23:25
211    |
212 LL | pub type FTT5 = for<'a> async unsafe extern "C" fn();
213    |                         ^^^^^ `async` because of this

285    |
286 
287 error: an `fn` pointer type cannot be `const`
-   --> $DIR/bad-fn-ptr-qualifier.rs:27:22
+   --> $DIR/bad-fn-ptr-qualifier.rs:34:22
289    |
290 LL | pub type W1 = unsafe const fn();
291    |                      ^^^^^ `const` because of this

298    |
299 
300 error: an `fn` pointer type cannot be `async`
-   --> $DIR/bad-fn-ptr-qualifier.rs:29:22
+   --> $DIR/bad-fn-ptr-qualifier.rs:36:22
302    |
303 LL | pub type W2 = unsafe async fn();
304    |                      ^^^^^ `async` because of this

310 LL + pub type W2 = unsafe fn();
311    |
312 
- error: an `fn` pointer type cannot be `gen`
+ error: expected one of `extern` or `fn`, found reserved keyword `gen`
314   --> $DIR/bad-fn-ptr-qualifier.rs:38:22
315    |
316 LL | pub type W3 = unsafe gen fn();

-    |                      ^^^ `gen` because of this
-    |
-    = note: allowed qualifiers are: `unsafe` and `extern`
- help: remove the `gen` qualifier
-    |
- LL - pub type W3 = unsafe gen fn();
- LL + pub type W3 = unsafe fn();
-    |
+    |                      ^^^ expected one of `extern` or `fn`
325 
- error: an `fn` pointer type cannot be `const`
-   --> $DIR/bad-fn-ptr-qualifier.rs:40:30
-    |
- LL | pub type W4 = for<'a> unsafe const fn();
-    |                              ^^^^^ `const` because of this
-    |
-    = note: allowed qualifiers are: `unsafe` and `extern`
- help: remove the `const` qualifier
-    |
- LL - pub type W4 = for<'a> unsafe const fn();
- LL + pub type W4 = for<'a> unsafe fn();
-    |
- 
- error: aborting due to 19 previous errors
+ error: aborting due to 25 previous errors
340 
---
-   --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:22:25
-   --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:23:25
-   --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:34:22
-   --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:36:22
+ LL + pub type T6 = fn();
+   --> $DIR/bad-fn-ptr-qualifier.rs:18:25
+   --> $DIR/bad-fn-ptr-qualifier.rs:19:25
+   --> $DIR/bad-fn-ptr-qualifier.rs:20:25
+   --> $DIR/bad-fn-ptr-qualifier.rs:21:25
+   --> $DIR/bad-fn-ptr-qualifier.rs:22:25
---
- //@ edition:2018
+ //@ edition:2024
3 // Most of items are taken from ./recover-const-async-fn-ptr.rs but this is able to apply rustfix.
4 
5 pub type T0 = fn(); //~ ERROR an `fn` pointer type cannot be `const`

8 pub type T3 = fn(); //~ ERROR an `fn` pointer type cannot be `async`
9 pub type T4 = extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `async`
10 pub type T5 = unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `async`
- pub type T6 = unsafe extern "C" fn();
+ pub type T6 = fn(); //~ ERROR an `fn` pointer type cannot be `gen`
+ pub type T7 = extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `gen`
+ pub type T8 = unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `gen`
+ pub type T9 = unsafe extern "C" fn();
12 //~^ ERROR an `fn` pointer type cannot be `const`
13 //~| ERROR an `fn` pointer type cannot be `async`
14 

19 pub type FTT4 = for<'a> extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `async`
20 pub type FTT5 = for<'a> unsafe extern "C" fn();
21 //~^ ERROR an `fn` pointer type cannot be `async`
- pub type FTT6 = for<'a> unsafe extern "C" fn();
+ pub type FTT6 = for<'a> fn(); //~ ERROR an `fn` pointer type cannot be `gen`
+ pub type FTT7 = for<'a> extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `gen`
+ pub type FTT8 = for<'a> unsafe extern "C" fn();
+ //~^ ERROR an `fn` pointer type cannot be `gen`
+ pub type FTT9 = for<'a> unsafe extern "C" fn();
23 //~^ ERROR an `fn` pointer type cannot be `const`
24 //~| ERROR an `fn` pointer type cannot be `async`
25 

28 //~^ ERROR an `fn` pointer type cannot be `const`
29 pub type W2 = unsafe fn();
30 //~^ ERROR an `fn` pointer type cannot be `async`
- pub type W3 = for<'a> unsafe fn();
+ pub type W3 = unsafe gen fn();
+ //~^ ERROR an `fn` pointer type cannot be `gen`
+ pub type W4 = for<'a> unsafe const fn();
32 //~^ ERROR an `fn` pointer type cannot be `const`
33 
34 fn main() {}


The actual fixed differed from the expected fixed
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args parser/bad-fn-ptr-qualifier.rs`

error: 2 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/parser/bad-fn-ptr-qualifier" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2024"
stdout: none
--- stderr -------------------------------
error: an `fn` pointer type cannot be `const`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:5:15
   |
LL | pub type T0 = const fn(); //~ ERROR an `fn` pointer type cannot be `const`
   |               ^^^^^ `const` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `const` qualifier
   |
LL - pub type T0 = const fn(); //~ ERROR an `fn` pointer type cannot be `const`
LL + pub type T0 = fn(); //~ ERROR an `fn` pointer type cannot be `const`
   |

error: an `fn` pointer type cannot be `const`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:6:15
   |
LL | pub type T1 = const extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `const`
   |               ^^^^^ `const` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `const` qualifier
   |
LL - pub type T1 = const extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `const`
LL + pub type T1 = extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `const`
   |

error: an `fn` pointer type cannot be `const`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:7:15
   |
LL | pub type T2 = const unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `const`
   |               ^^^^^ `const` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `const` qualifier
   |
LL - pub type T2 = const unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `const`
LL + pub type T2 = unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `const`
   |

error: an `fn` pointer type cannot be `async`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:8:15
   |
LL | pub type T3 = async fn(); //~ ERROR an `fn` pointer type cannot be `async`
   |               ^^^^^ `async` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `async` qualifier
   |
LL - pub type T3 = async fn(); //~ ERROR an `fn` pointer type cannot be `async`
LL + pub type T3 = fn(); //~ ERROR an `fn` pointer type cannot be `async`
   |

error: an `fn` pointer type cannot be `async`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:9:15
   |
LL | pub type T4 = async extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `async`
   |               ^^^^^ `async` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `async` qualifier
   |
LL - pub type T4 = async extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `async`
LL + pub type T4 = extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `async`
   |

error: an `fn` pointer type cannot be `async`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:10:15
   |
LL | pub type T5 = async unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `async`
   |               ^^^^^ `async` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `async` qualifier
   |
LL - pub type T5 = async unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `async`
LL + pub type T5 = unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `async`
   |

error: an `fn` pointer type cannot be `gen`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:11:15
   |
LL | pub type T6 = gen fn(); //~ ERROR an `fn` pointer type cannot be `gen`
   |               ^^^ `gen` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `gen` qualifier
   |
LL - pub type T6 = gen fn(); //~ ERROR an `fn` pointer type cannot be `gen`
LL + pub type T6 = fn(); //~ ERROR an `fn` pointer type cannot be `gen`
   |

error: an `fn` pointer type cannot be `gen`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:12:15
   |
LL | pub type T7 = gen extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `gen`
   |               ^^^ `gen` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `gen` qualifier
   |
LL - pub type T7 = gen extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `gen`
LL + pub type T7 = extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `gen`
   |

error: an `fn` pointer type cannot be `gen`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:13:15
   |
LL | pub type T8 = gen unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `gen`
   |               ^^^ `gen` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `gen` qualifier
   |
LL - pub type T8 = gen unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `gen`
LL + pub type T8 = unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `gen`
   |

error: an `fn` pointer type cannot be `const`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:14:15
   |
LL | pub type T9 = const async unsafe extern "C" fn();
   |               ^^^^^ `const` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `const` qualifier
   |
LL - pub type T9 = const async unsafe extern "C" fn();
LL + pub type T9 = async unsafe extern "C" fn();
   |

error: an `fn` pointer type cannot be `async`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:14:21
   |
---

error: an `fn` pointer type cannot be `const`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:18:25
   |
LL | pub type FTT0 = for<'a> const fn(); //~ ERROR an `fn` pointer type cannot be `const`
   |                         ^^^^^ `const` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `const` qualifier
   |
LL - pub type FTT0 = for<'a> const fn(); //~ ERROR an `fn` pointer type cannot be `const`
LL + pub type FTT0 = for<'a> fn(); //~ ERROR an `fn` pointer type cannot be `const`
   |

error: an `fn` pointer type cannot be `const`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:19:25
   |
LL | pub type FTT1 = for<'a> const extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `const`
   |                         ^^^^^ `const` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `const` qualifier
   |
LL - pub type FTT1 = for<'a> const extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `const`
LL + pub type FTT1 = for<'a> extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `const`
   |

error: an `fn` pointer type cannot be `const`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:20:25
   |
LL | pub type FTT2 = for<'a> const unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `const`
   |                         ^^^^^ `const` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `const` qualifier
   |
LL - pub type FTT2 = for<'a> const unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `const`
LL + pub type FTT2 = for<'a> unsafe extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `const`
   |

error: an `fn` pointer type cannot be `async`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:21:25
   |
LL | pub type FTT3 = for<'a> async fn(); //~ ERROR an `fn` pointer type cannot be `async`
   |                         ^^^^^ `async` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `async` qualifier
   |
LL - pub type FTT3 = for<'a> async fn(); //~ ERROR an `fn` pointer type cannot be `async`
LL + pub type FTT3 = for<'a> fn(); //~ ERROR an `fn` pointer type cannot be `async`
   |

error: an `fn` pointer type cannot be `async`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:22:25
   |
LL | pub type FTT4 = for<'a> async extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `async`
   |                         ^^^^^ `async` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `async` qualifier
   |
LL - pub type FTT4 = for<'a> async extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `async`
LL + pub type FTT4 = for<'a> extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `async`
   |

error: an `fn` pointer type cannot be `async`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:23:25
   |
LL | pub type FTT5 = for<'a> async unsafe extern "C" fn();
   |                         ^^^^^ `async` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `async` qualifier
   |
LL - pub type FTT5 = for<'a> async unsafe extern "C" fn();
LL + pub type FTT5 = for<'a> unsafe extern "C" fn();
   |

error: an `fn` pointer type cannot be `gen`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:25:25
   |
LL | pub type FTT6 = for<'a> gen fn(); //~ ERROR an `fn` pointer type cannot be `gen`
   |                         ^^^ `gen` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `gen` qualifier
   |
LL - pub type FTT6 = for<'a> gen fn(); //~ ERROR an `fn` pointer type cannot be `gen`
LL + pub type FTT6 = for<'a> fn(); //~ ERROR an `fn` pointer type cannot be `gen`
   |

error: an `fn` pointer type cannot be `gen`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:26:25
   |
LL | pub type FTT7 = for<'a> gen extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `gen`
   |                         ^^^ `gen` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `gen` qualifier
   |
LL - pub type FTT7 = for<'a> gen extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `gen`
LL + pub type FTT7 = for<'a> extern "C" fn(); //~ ERROR an `fn` pointer type cannot be `gen`
   |

error: an `fn` pointer type cannot be `gen`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:27:25
   |
LL | pub type FTT8 = for<'a> gen unsafe extern "C" fn();
   |                         ^^^ `gen` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `gen` qualifier
   |
LL - pub type FTT8 = for<'a> gen unsafe extern "C" fn();
LL + pub type FTT8 = for<'a> unsafe extern "C" fn();
   |

error: an `fn` pointer type cannot be `const`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:29:25
   |
LL | pub type FTT9 = for<'a> const async unsafe extern "C" fn();
   |                         ^^^^^ `const` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `const` qualifier
   |
LL - pub type FTT9 = for<'a> const async unsafe extern "C" fn();
LL + pub type FTT9 = for<'a> async unsafe extern "C" fn();
   |

error: an `fn` pointer type cannot be `async`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:29:31
   |
LL | pub type FTT9 = for<'a> const async unsafe extern "C" fn();
   |                               ^^^^^ `async` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `async` qualifier
   |
LL - pub type FTT9 = for<'a> const async unsafe extern "C" fn();
LL + pub type FTT9 = for<'a> const unsafe extern "C" fn();
   |

error: an `fn` pointer type cannot be `const`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:34:22
   |
LL | pub type W1 = unsafe const fn();
   |                      ^^^^^ `const` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `const` qualifier
   |
LL - pub type W1 = unsafe const fn();
LL + pub type W1 = unsafe fn();
   |

error: an `fn` pointer type cannot be `async`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:36:22
   |
LL | pub type W2 = unsafe async fn();
   |                      ^^^^^ `async` because of this
   |
   = note: allowed qualifiers are: `unsafe` and `extern`
help: remove the `async` qualifier
   |
LL - pub type W2 = unsafe async fn();
LL + pub type W2 = unsafe fn();
   |

error: expected one of `extern` or `fn`, found reserved keyword `gen`
##[error]  --> /checkout/tests/ui/parser/bad-fn-ptr-qualifier.rs:38:22
   |
LL | pub type W3 = unsafe gen fn();
   |                      ^^^ expected one of `extern` or `fn`

error: aborting due to 25 previous errors
------------------------------------------

---- [ui] tests/ui/parser/bad-fn-ptr-qualifier.rs stdout end ----