src/test/ui/traits/traits-negative-impls.rs

// The dummy functions are used to avoid adding new cfail files.
// What happens is that the compiler attempts to squash duplicates and some
// errors are not reported. This way, we make sure that, for each function, different
// typeck phases are involved and all errors are reported.

#![feature(optin_builtin_traits)]

use std::marker::Send;

struct Outer<T: Send>(T);

struct Outer2<T>(T);

unsafe impl<T: Send> Sync for Outer2<T> {}

fn is_send<T: Send>(_: T) {}
fn is_sync<T: Sync>(_: T) {}

fn dummy() {
    struct TestType;
    impl !Send for TestType {}

    Outer(TestType);
    //~^ ERROR `dummy::TestType` cannot be sent between threads safely
    //~| ERROR `dummy::TestType` cannot be sent between threads safely
}

fn dummy1b() {
    struct TestType;
    impl !Send for TestType {}

    is_send(TestType);
    //~^ ERROR `dummy1b::TestType` cannot be sent between threads safely
}

fn dummy1c() {
    struct TestType;
    impl !Send for TestType {}

    is_send((8, TestType));
    //~^ ERROR `dummy1c::TestType` cannot be sent between threads safely
}

fn dummy2() {
    struct TestType;
    impl !Send for TestType {}

    is_send(Box::new(TestType));
    //~^ ERROR `dummy2::TestType` cannot be sent between threads safely
}

fn dummy3() {
    struct TestType;
    impl !Send for TestType {}

    is_send(Box::new(Outer2(TestType)));
    //~^ ERROR `dummy3::TestType` cannot be sent between threads safely
}

fn main() {
    struct TestType;
    impl !Send for TestType {}

    // This will complain about a missing Send impl because `Sync` is implement *just*
    // for T that are `Send`. Look at #20366 and #19950
    is_sync(Outer2(TestType));
    //~^ ERROR `main::TestType` cannot be sent between threads safely
}