60 lines
1.6 KiB
Rust
60 lines
1.6 KiB
Rust
// revisions: no_flag with_flag
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// [no_flag] check-pass
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// [with_flag] compile-flags: -Zextra-const-ub-checks
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#![feature(never_type)]
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use std::mem::transmute;
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use std::ptr::addr_of;
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#[derive(Clone, Copy)]
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enum E { A, B }
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#[derive(Clone, Copy)]
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enum Never {}
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// An enum with uninhabited variants but also at least 2 inhabited variants -- so the uninhabited
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// variants *do* have a discriminant.
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#[derive(Clone, Copy)]
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enum UninhDiscriminant {
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A,
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B(!),
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C,
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D(Never),
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}
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const INVALID_BOOL: () = unsafe {
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let _x: bool = transmute(3u8);
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//[with_flag]~^ ERROR: evaluation of constant value failed
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//[with_flag]~| invalid value
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};
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const INVALID_PTR_IN_INT: () = unsafe {
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let _x: usize = transmute(&3u8);
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//[with_flag]~^ ERROR: evaluation of constant value failed
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};
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const INVALID_SLICE_TO_USIZE_TRANSMUTE: () = unsafe {
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let x: &[u8] = &[0; 32];
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let _x: (usize, usize) = transmute(x);
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//[with_flag]~^ ERROR: evaluation of constant value failed
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};
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const UNALIGNED_PTR: () = unsafe {
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let _x: &u32 = transmute(&[0u8; 4]);
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//[with_flag]~^ ERROR: evaluation of constant value failed
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//[with_flag]~| invalid value
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};
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const UNINHABITED_VARIANT: () = unsafe {
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let data = [1u8];
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// Not using transmute, we want to hit the ImmTy code path.
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let v = *addr_of!(data).cast::<UninhDiscriminant>();
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//[with_flag]~^ ERROR: evaluation of constant value failed
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};
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// Regression tests for an ICE (related to <https://github.com/rust-lang/rust/issues/113988>).
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const VALID_ENUM1: E = { let e = E::A; e };
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const VALID_ENUM2: Result<&'static [u8], ()> = { let e = Err(()); e };
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fn main() {}
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