rayon-core 1.12.1

Core APIs for Rayon
Documentation 
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use rayon_core::ThreadPoolBuilder;
use std::error::Error;

#[test]
#[cfg_attr(any(target_os = "emscripten", target_family = "wasm"), ignore)]
fn double_init_fail() {
    let result1 = ThreadPoolBuilder::new().build_global();
    assert!(result1.is_ok());
    let err = ThreadPoolBuilder::new().build_global().unwrap_err();
    assert!(err.source().is_none());
    assert_eq!(
        err.to_string(),
        "The global thread pool has already been initialized.",
    );
}