RS.CLIPPY.UNNECESSARY_OPERATION

Outer expressions with no effect

This checker is a Clippy lint created by The Rust Project Contributors. The documentation shown here is a copy of the original documentation for: unnecessary_operation. Copyright ©2025 The Rust Team. All rights reserved.

What it does

Checks for expression statements that can be reduced to a sub-expression.

Why is this bad?

Expressions by themselves often have no side-effects. Having such expressions reduces readability.

Example

compute_array()[0];