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//! Regression test for an LLVM assertion that used to be hit when:
//!
//! - There's a generic enum contained within a tuple struct
//! - When the tuple struct is parameterized by some lifetime `'a`
//! - The enum is concretized with its type argument being a reference to a trait object (of
//! lifetime `'a`)
//!
//! Issue: <https://github.com/rust-lang/rust/issues/9719>
//@ build-pass
// Dummy trait implemented for `isize` to use in the test cases
pub trait MyTrait {
fn dummy(&self) {}
}
impl MyTrait for isize {}
// `&dyn MyTrait` contained in enum variant
pub struct EnumRefDynTrait<'a>(Enum<&'a (dyn MyTrait + 'a)>);
pub enum Enum<T> {
Variant(T),
}
fn enum_dyn_trait() {
let x: isize = 42;
let y = EnumRefDynTrait(Enum::Variant(&x as &dyn MyTrait));
let _ = y;
}
// `&dyn MyTrait` contained behind `Option` in named field of struct
struct RefDynTraitNamed<'a> {
x: Option<&'a (dyn MyTrait + 'a)>,
}
fn named_option_dyn_trait() {
let x: isize = 42;
let y = RefDynTraitNamed { x: Some(&x as &dyn MyTrait) };
let _ = y;
}
// `&dyn MyTrait` contained behind `Option` in unnamed field of struct
pub struct RefDynTraitUnnamed<'a>(Option<&'a (dyn MyTrait + 'a)>);
fn unnamed_option_dyn_trait() {
let x: isize = 42;
let y = RefDynTraitUnnamed(Some(&x as &dyn MyTrait));
let _ = y;
}
pub fn main() {
enum_dyn_trait();
named_option_dyn_trait();
unnamed_option_dyn_trait();
}
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