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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// New test for #53818: modifying static memory at compile-time is not allowed.
// The test should never compile successfully
#![feature(const_raw_ptr_deref)]
#![feature(const_let)]
use std::cell::UnsafeCell;
struct Foo(UnsafeCell<u32>);
unsafe impl Send for Foo {}
unsafe impl Sync for Foo {}
static FOO: Foo = Foo(UnsafeCell::new(42));
fn foo() {}
static BAR: () = unsafe {
*FOO.0.get() = 5;
// we do not error on the above access, because that is not detectable statically. Instead,
// const evaluation will error when trying to evaluate it. Due to the error below, we never even
// attempt to const evaluate `BAR`, so we don't see the error
foo();
//~^ ERROR calls in statics are limited to constant functions, tuple structs and tuple variants
};
fn main() {
println!("{}", unsafe { *FOO.0.get() });
}
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