E0625 - Error codes index (original) (raw)

Error codes index

Error code E0625

A compile-time const variable is referring to a thread-local static variable.

Erroneous code example:

#![allow(unused)]
#![feature(thread_local)]

fn main() {
#[thread_local]
static X: usize = 12;

const Y: usize = 2 * X;
}

Static and const variables can refer to other const variables but a const variable cannot refer to a thread-local static variable. In this example,Y cannot refer to X. To fix this, the value can be extracted as a const and then used:

#![allow(unused)]
#![feature(thread_local)]

fn main() {
const C: usize = 12;

#[thread_local]
static X: usize = C;

const Y: usize = 2 * C;
}