clippy::enum_clike_unportable_variant: C-like enum variant discriminant is not portable to 32-bit targets

What you see

error: C-like enum variant discriminant is not portable to 32-bit targets
 --> main.rs:5:5
  |
5 |     X = 0x1_0000_0000,
  |     ^^^^^^^^^^^^^^^^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#enum_clike_unportable_variant
  = note: `#[deny(clippy::enum_clike_unportable_variant)]` on by default

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 will truncate the variant value on 32 bit architectures, but works fine on 64 bit.

Code that is almost certainly wrong. Denied by default: the build fails until you fix it or allow it.

How to fix it

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

Flagged

#[repr(usize)]
enum NonPortable {
    X = 0x1_0000_0000,
    Y = 0,
}

Turn it off, or on

Allow it where it does not fit your code, as narrowly as you can:

#[allow(clippy::enum_clike_unportable_variant)]
fn my_function() { /* ... */ }

[lints.clippy]
enum_clike_unportable_variant = "allow"

cargo clippy -- -A clippy::enum-clike-unportable-variant

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.