`ptr-as-ptr` suggestion syntax error

[matthiaskrgr]

Using the following flags

--force-warn clippy::ptr-as-ptr

this code:

pub fn main() {
    unsafe {
        let _: fn() = std::mem::transmute(std::ptr::null::<()>() as *const u8);
    }
}

caused the following diagnostics:

    Checking _a v0.1.0 (/tmp/icemaker_global_tempdir.RlzFTnosKj1Z/icemaker_clippyfix_tempdir.tE6mKU77D3m6/_a)
warning: `as` casting between raw pointers without changing their constness
 --> src/main.rs:3:43
  |
3 |         let _: fn() = std::mem::transmute(std::ptr::null::<()>() as *const u8);
  |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try call directly: `std::ptr::null<()>::<u8>()`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_as_ptr
  = note: requested on the command line with `--force-warn clippy::ptr-as-ptr`

warning: `_a` (bin "_a") generated 1 warning (run `cargo clippy --fix --bin "_a"` to apply 1 suggestion)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.35s

However after applying these diagnostics, the resulting code:

pub fn main() {
    unsafe {
        let _: fn() = std::mem::transmute(std::ptr::null::<()>::<u8>());
    }
}

no longer compiled:

    Checking _a v0.1.0 (/tmp/icemaker_global_tempdir.RlzFTnosKj1Z/icemaker_clippyfix_tempdir.tE6mKU77D3m6/_a)
error: expected identifier, found `<`
 --> src/main.rs:3:65
  |
3 |         let _: fn() = std::mem::transmute(std::ptr::null::<()>::<u8>());
  |                                                                 ^ expected identifier

error: could not compile `_a` (bin "_a" test) due to 1 previous error
warning: build failed, waiting for other jobs to finish...
error: could not compile `_a` (bin "_a") due to 1 previous error

Version:

rustc 1.90.0-nightly (3014e79f9 2025-07-15)
binary: rustc
commit-hash: 3014e79f9c8d5510ea7b3a3b70d171d0948b1e96
commit-date: 2025-07-15
host: x86_64-unknown-linux-gnu
release: 1.90.0-nightly
LLVM version: 20.1.8