`collapsible_else_if` lint false positive

[sabify]

Summary

There is a bug in the collapsible_else_if lint that shows an irrelevant warning about collapsing else if statements when it shouldn't.

Lint Name

collapsible_else_if

Reproducer

I tried this code:

fn main() {
    let x = if true {
        Some(1)
    } else {
        if true {
            println!("Some debug information");
        };
        None
    };
}

I saw this happen:

warning: this `else { if .. }` block can be collapsed
 --> src/main.rs:4:12
  |
4 |       } else {
  |  ____________^
5 | |         if true {
6 | |             println!("Some debug information");
7 | |         };
8 | |         None
9 | |     };
  | |_____^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_else_if
  = note: `#[warn(clippy::collapsible_else_if)]` on by default
help: collapse nested if block
  |
4 ~     } else if true {
5 +         println!("Some debug information");
6 ~     };
  |

I expected to see this happen:

No warning.

Version

rustc 1.88.0-nightly (b45dd71d1 2025-04-30)
binary: rustc
commit-hash: b45dd71d1824f176fba88f6c40467030a16afa2c
commit-date: 2025-04-30
host: aarch64-apple-darwin
release: 1.88.0-nightly
LLVM version: 20.1.2

Additional Labels

No response

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