clippy::shadow_reuse: `x` is shadowed

What you see

warning: `x` is shadowed
 --> main.rs:4:5
  |
4 | let x = x + 1;
  |     ^
  |
note: previous binding is here
 --> main.rs:3:5
  |
3 | let x = 2;
  |     ^
  = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#shadow_reuse
  = note: requested on the command line with `-W clippy::shadow-reuse`

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 argue that name shadowing like this hurts readability, because a value may be bound to different things depending on position in the code. See also shadow_same and shadow_unrelated for other restrictions on shadowing.

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

let x = 2;
let x = x + 1;

Write this instead

let x = 2;
let y = x + 1;

Turn it off, or on

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

[lints.clippy]
shadow_reuse = "warn"

#![warn(clippy::shadow_reuse)]

cargo clippy -- -W clippy::shadow-reuse

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.