RS.CLIPPY.UNREADABLE_LITERAL

Long literal without underscores

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

What it does

Warns if a long integral or floating-point constant does not contain underscores.

Why is this bad?

Reading long numbers is difficult without separators.

Example

61864918973511

Use instead:

61_864_918_973_511

Configuration

  • unreadable-literal-lint-fractions: Should the fraction of a decimal be linted to include separators.

    (default: true)