warning: unneeded `return` statement
 --> src/main.rs:9:5
  |
9 |     return unsafe {f1()} as *const i32;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
  = note: `#[warn(clippy::needless_return)]` on by default
help: remove `return`
  |
9 -     return unsafe {f1()} as *const i32;
9 +     unsafe {f1()} as *const i32
  |

after fixes were automatically applied the compiler reported errors within these files:

  * xxx

This likely indicates a bug in either rustc or cargo itself,
and we would appreciate a bug report! You're likely to see
a number of compiler warnings after this message which cargo
attempted to fix but failed. If you could open an issue at
https://github.com/rust-lang/rust-clippy/issues
quoting the full output of this command we'd be very appreciative!
Note that you may be able to make some more progress in the near-term
fixing code with the `--broken-code` flag

The following errors were reported:

error: expected expression, found `as`
  --> xxx
   |
42 |     unsafe {f1()} as *const i32
   |                   ^^ expected expression
   |
help: parentheses are required to parse this as an expression
   |
42 |     (unsafe {f1()}) as *const i32
   |     +

rustc 1.77.0-nightly (714b29a17 2024-01-15)
binary: rustc
commit-hash: 714b29a17ff5fa727c794bbb60bfd335f8e75d42
commit-date: 2024-01-15
host: aarch64-apple-darwin
release: 1.77.0-nightly
LLVM version: 17.0.6