clippy::else_if_without_else: `if` expression with an `else if`, but without a final `else`

What you see

warning: `if` expression with an `else if`, but without a final `else`
 --> main.rs:5:8
  |
5 |   } else if x.is_negative() {
  |  ________^
6 | |     b();
7 | | }
  | |_^
  |
  = help: add an `else` block here
  = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#else_if_without_else
  = note: requested on the command line with `-W clippy::else-if-without-else`

Real output of Clippy 0.1.99 (Rust 1.99) on the example below. Names and line numbers in yours will differ.

Does it matter?

Some coding guidelines require this (e.g., MISRA-C:2004 Rule 14.10).

Lints that forbid language features for specific codebases (no unwrap, no indexing...). Off by default; pick them one by one, never the whole group.

How to fix it

Clippy does not fix this one automatically. Change the code by hand:

Flagged

if x.is_positive() {
    a();
} else if x.is_negative() {
    b();
}

Write this instead

if x.is_positive() {
    a();
} else if x.is_negative() {
    b();
} else {
    // We don't care about zero.
}

Turn it off, or on

It is off by default. To use it, set it to warn or deny:

[lints.clippy]
else_if_without_else = "warn"

#![warn(clippy::else_if_without_else)]

cargo clippy -- -W clippy::else-if-without-else

The [lints] table needs Rust 1.74 or newer. In a workspace, put it under [workspace.lints.clippy] and add [lints] workspace = true to each member.