| // run-pass |
| // ignore-wasm32-bare always compiled as panic=abort right now and this requires unwinding |
| // This test checks that instantiating an uninhabited type via `mem::{uninitialized,zeroed}` results |
| // in a runtime panic. |
| |
| #![feature(never_type)] |
| #![allow(deprecated, invalid_value)] |
| |
| use std::{mem, panic}; |
| |
| #[allow(dead_code)] |
| struct Foo { |
| x: u8, |
| y: !, |
| } |
| |
| enum Bar {} |
| |
| fn main() { |
| unsafe { |
| assert_eq!( |
| panic::catch_unwind(|| { |
| mem::uninitialized::<!>() |
| }).err().and_then(|a| a.downcast_ref::<String>().map(|s| { |
| s == "Attempted to instantiate uninhabited type !" |
| })), |
| Some(true) |
| ); |
| |
| assert_eq!( |
| panic::catch_unwind(|| { |
| mem::zeroed::<!>() |
| }).err().and_then(|a| a.downcast_ref::<String>().map(|s| { |
| s == "Attempted to instantiate uninhabited type !" |
| })), |
| Some(true) |
| ); |
| |
| assert_eq!( |
| panic::catch_unwind(|| { |
| mem::MaybeUninit::<!>::uninit().assume_init() |
| }).err().and_then(|a| a.downcast_ref::<String>().map(|s| { |
| s == "Attempted to instantiate uninhabited type !" |
| })), |
| Some(true) |
| ); |
| |
| assert_eq!( |
| panic::catch_unwind(|| { |
| mem::uninitialized::<Foo>() |
| }).err().and_then(|a| a.downcast_ref::<String>().map(|s| { |
| s == "Attempted to instantiate uninhabited type Foo" |
| })), |
| Some(true) |
| ); |
| |
| assert_eq!( |
| panic::catch_unwind(|| { |
| mem::zeroed::<Foo>() |
| }).err().and_then(|a| a.downcast_ref::<String>().map(|s| { |
| s == "Attempted to instantiate uninhabited type Foo" |
| })), |
| Some(true) |
| ); |
| |
| assert_eq!( |
| panic::catch_unwind(|| { |
| mem::MaybeUninit::<Foo>::uninit().assume_init() |
| }).err().and_then(|a| a.downcast_ref::<String>().map(|s| { |
| s == "Attempted to instantiate uninhabited type Foo" |
| })), |
| Some(true) |
| ); |
| |
| assert_eq!( |
| panic::catch_unwind(|| { |
| mem::uninitialized::<Bar>() |
| }).err().and_then(|a| a.downcast_ref::<String>().map(|s| { |
| s == "Attempted to instantiate uninhabited type Bar" |
| })), |
| Some(true) |
| ); |
| |
| assert_eq!( |
| panic::catch_unwind(|| { |
| mem::zeroed::<Bar>() |
| }).err().and_then(|a| a.downcast_ref::<String>().map(|s| { |
| s == "Attempted to instantiate uninhabited type Bar" |
| })), |
| Some(true) |
| ); |
| |
| assert_eq!( |
| panic::catch_unwind(|| { |
| mem::MaybeUninit::<Bar>::uninit().assume_init() |
| }).err().and_then(|a| a.downcast_ref::<String>().map(|s| { |
| s == "Attempted to instantiate uninhabited type Bar" |
| })), |
| Some(true) |
| ); |
| } |
| } |