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rust source #1
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mrustc (master)
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Source code
#[inline(never)] pub fn f() -> &'static Option<i32> { &Some(10) } #[inline(never)] pub fn g() -> &'static [u8; 8] { &[0x01, 0x00, 0x00, 0x00, 0x0a, 0x00, 0x00, 0x00] } #[inline(never)] pub fn h() -> &'static [u32; 2] { &[1, 10] } #[allow(dead_code)] #[repr(u32)] enum Tag { NoneTag = 0, SomeTag = 1, } use Tag::*; #[repr(C)] pub struct CurrentOptionI32Repr { tag: Tag, payload: CurrentOptionI32ReprPayload, } #[allow(dead_code)] union CurrentOptionI32ReprPayload { none_case: (), some_case: i32, } #[inline(never)] pub fn i() -> &'static CurrentOptionI32Repr { &CurrentOptionI32Repr { tag: SomeTag, payload: CurrentOptionI32ReprPayload { some_case: 10, } } } #[inline(never)] pub fn j() -> Option<i32> { Some(10) } use core::mem::MaybeUninit; #[inline(never)] pub fn k(r: &mut MaybeUninit<Option<i32>>) { r.write(Some(10)); } // what about u8? #[repr(u8)] pub enum MyOption<T> { MyNone, MySome(T), } use MyOption::*; pub fn l() -> &'static Option<i32> { const C: &Option<i32> = &unsafe { // using something other than 0, 0, 0 after 1_u8 fails std::mem::transmute([1_u8, 0, 0, 0, 10, 0, 0, 0]) }; C } pub fn m() -> &'static MyOption<i32> { const C: &MyOption<i32> = &unsafe { // any data is accepted in the 3 bytes after 1_u8 std::mem::transmute([1_u8, 42, 42, 42, 10, 0, 0, 0]) }; C } #[inline(never)] pub fn n(r: &mut MaybeUninit<MyOption<i32>>) { r.write(MySome(10)); }
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