rust/tests/run-make/libtest-thread-limit/test.rs

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use std::{
io::ErrorKind,
sync::OnceLock,
thread::{self, Builder, ThreadId},
};
static THREAD_ID: OnceLock<ThreadId> = OnceLock::new();
#[test]
fn spawn_thread_would_block() {
assert_eq!(Builder::new().spawn(|| unreachable!()).unwrap_err().kind(), ErrorKind::WouldBlock);
THREAD_ID.set(thread::current().id()).unwrap();
}
#[test]
fn run_in_same_thread() {
assert_eq!(*THREAD_ID.get().unwrap(), thread::current().id());
}