`if_then_some_else_none` triggers even though code contains `.await` in the `if` branch

[LHolten]

Summary

The lint triggers even though bool::then doesn't work with async code.

Lint Name

if_then_some_else_none

Reproducer

I tried this code:

pub async fn foo() -> u32 {
    todo!()
}

pub async fn bar(cond: bool) -> Option<u32> {
    if cond { Some(foo().await) } else { None }
}

I saw this happen:

The following errors were reported:
error[E0728]: `await` is only allowed inside `async` functions and blocks
   --> main/lib/src/chargesession.rs:365:24
    |
365 |     cond.then(|| foo().await)
    |               --       ^^^^^ only allowed inside `async` functions and blocks
    |               |
    |               this is not `async`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0728`.
Original diagnostics will follow.

warning: this could be simplified with `bool::then`
   --> main/lib/src/chargesession.rs:365:5
    |
365 |     if cond { Some(foo().await) } else { None }
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cond.then(|| foo().await)`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.91.0/index.html#if_then_some_else_none
    = note: `-D clippy::if-then-some-else-none` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::if_then_some_else_none)]`

I expected to see this happen:

Lint should not trigger on this code.

Version

rustc 1.91.1 (ed61e7d7e 2025-11-07)
binary: rustc
commit-hash: ed61e7d7e242494fb7057f2657300d9e77bb4fcb
commit-date: 2025-11-07
host: x86_64-unknown-linux-gnu
release: 1.91.1
LLVM version: 21.1.2

Additional Labels

No response