Incorrect suggestion by `manual_is_variant_and`

[Nugine]

Summary

Incorrect suggestion by manual_is_variant_and

Reproducer

I tried this code:

#![deny(clippy::manual_is_variant_and)]

fn main() {
    let xs = [None, Some(b'_'), Some(b'1')];
    for x in xs {
        let a1 = dbg!(x.map(|b| b.is_ascii_digit()) != Some(true));
        let a2 = dbg!(x.is_none_or(|b| b.is_ascii_digit()));
        assert_eq!(a1, a2);
    }
}

error: called `.map() != Some()`
 --> src/main.rs:6:18
  |
6 |         let a1 = x.map(|b| b.is_ascii_digit()) != Some(true);
  |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `x.is_none_or(|b| b.is_ascii_digit())`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_is_variant_and
note: the lint level is defined here
 --> src/main.rs:1:9
  |
1 | #![deny(clippy::manual_is_variant_and)]
  |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I expected to see this happen:

Instead, this happened:

   Compiling playground v0.0.1 (/playground)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.45s
     Running `target/debug/playground`
[src/main.rs:6:18] x.map(|b| b.is_ascii_digit()) != Some(true) = true
[src/main.rs:7:18] x.is_none_or(|b| b.is_ascii_digit()) = true
[src/main.rs:6:18] x.map(|b| b.is_ascii_digit()) != Some(true) = true
[src/main.rs:7:18] x.is_none_or(|b| b.is_ascii_digit()) = false

thread 'main' panicked at src/main.rs:8:9:
assertion `left == right` failed
  left: true
 right: false

Version

rustc 1.90.0-nightly (667787527 2025-07-02)
binary: rustc
commit-hash: 6677875279b560442a07a08d5119b4cd6b3c5593
commit-date: 2025-07-02
host: x86_64-unknown-linux-gnu
release: 1.90.0-nightly
LLVM version: 20.1.7

Additional Labels

@rustbot label +I-suggestion-causes-bug