clippy::panic: `panic` should not be present in production code

What you see

warning: `panic` should not be present in production code
 --> main.rs:3:1
  |
3 | panic!("even with a good reason");
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#panic
  = note: requested on the command line with `-W clippy::panic`

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?

This macro, or panics in general, may be unwanted in production code.

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

panic!("even with a good reason");

Turn it off, or on

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

[lints.clippy]
panic = "warn"

#![warn(clippy::panic)]

cargo clippy -- -W clippy::panic

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.

Settings in clippy.toml

• allow-panic-in-tests: Whether panic should be allowed in test functions or #[cfg(test)]