39 lines
1.1 KiB
Rust
39 lines
1.1 KiB
Rust
#![feature(core_intrinsics, const_raw_ptr_comparison)]
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use std::intrinsics;
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use std::mem::{size_of, size_of_val};
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struct Bomb;
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impl Drop for Bomb {
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fn drop(&mut self) {
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eprintln!("BOOM!");
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}
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}
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fn main() {
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assert_eq!(size_of::<Option<i32>>(), 8);
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assert_eq!(size_of_val(&()), 0);
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assert_eq!(size_of_val(&42), 4);
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assert_eq!(size_of_val(&[] as &[i32]), 0);
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assert_eq!(size_of_val(&[1, 2, 3] as &[i32]), 12);
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assert_eq!(size_of_val("foobar"), 6);
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assert_eq!(intrinsics::type_name::<Option<i32>>(), "core::option::Option<i32>");
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assert_eq!(intrinsics::likely(false), false);
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assert_eq!(intrinsics::unlikely(true), true);
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unsafe { intrinsics::forget(Bomb); }
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let _v = intrinsics::discriminant_value(&Some(()));
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let _v = intrinsics::discriminant_value(&0);
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let _v = intrinsics::discriminant_value(&true);
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let _v = intrinsics::discriminant_value(&vec![1,2,3]);
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let addr = &13 as *const i32;
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let addr2 = (addr as usize).wrapping_add(usize::MAX).wrapping_add(1);
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assert!(addr.guaranteed_eq(addr2 as *const _));
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assert!(addr.guaranteed_ne(0x100 as *const _));
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}
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