rust/tests/ui/closures/fnonce-call-twice-error.rs

//! Test that `FnOnce` closures cannot be called twice.

use std::sync::Arc;

fn foo<F: FnOnce()>(blk: F) {
    blk();
    blk(); //~ ERROR use of moved value
}

fn main() {
    let x = Arc::new(true);
    foo(move || {
        assert!(*x);
        drop(x);
    });
}
cleaned up some tests 2025-07-01 02:09:12 +05:00			//! Test that `FnOnce` closures cannot be called twice.
Add tests for once functions (#2549). 2013-06-17 19:25:06 -04:00
sync: Move underneath libstd This commit is the final step in the libstd facade, #13851. The purpose of this commit is to move libsync underneath the standard library, behind the facade. This will allow core primitives like channels, queues, and atomics to all live in the same location. There were a few notable changes and a few breaking changes as part of this movement: * The `Vec` and `String` types are reexported at the top level of libcollections * The `unreachable!()` macro was copied to libcore * The `std::rt::thread` module was moved to librustrt, but it is still reexported at the same location. * The `std::comm` module was moved to libsync * The `sync::comm` module was moved under `sync::comm`, and renamed to `duplex`. It is now a private module with types/functions being reexported under `sync::comm`. This is a breaking change for any existing users of duplex streams. * All concurrent queues/deques were moved directly under libsync. They are also all marked with #![experimental] for now if they are public. * The `task_pool` and `future` modules no longer live in libsync, but rather live under `std::sync`. They will forever live at this location, but they may move to libsync if the `std::task` module moves as well. [breaking-change] 2014-06-07 11:13:26 -07:00			`use std::sync::Arc;`
Add tests for once functions (#2549). 2013-06-17 19:25:06 -04:00
cleaned up some tests 2025-07-01 02:09:12 +05:00			`fn foo<F: FnOnce()>(blk: F) {`
Add tests for once functions (#2549). 2013-06-17 19:25:06 -04:00			`blk();`
			`blk(); //~ ERROR use of moved value`
			`}`

			`fn main() {`
move concurrent stuff from libextra to libsync 2014-01-30 15:04:47 -05:00			`let x = Arc::new(true);`
cleaned up some tests 2025-07-01 02:09:12 +05:00			`foo(move \|\| {`
test: Update all tests with the sync changes 2014-03-22 00:55:50 -07:00			`assert!(*x);`
Move std::util::ignore to std::prelude::drop It's a more fitting name for the most common use case of this function. 2013-12-02 22:37:26 -08:00			`drop(x);`
Remove do keyword from test/ 2014-01-27 18:29:50 -05:00			`});`
Add tests for once functions (#2549). 2013-06-17 19:25:06 -04:00			`}`