mirror of https://github.com/rust-lang/rust.git
51 lines
1.0 KiB
Rust
51 lines
1.0 KiB
Rust
// Regression test for #79457.
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#![feature(min_specialization)]
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use std::any::Any;
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pub trait Tr {
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fn method(self) -> Box<dyn Any + 'static>;
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fn other(self);
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}
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impl<T: Any + 'static> Tr for T {
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default fn method(self) -> Box<dyn Any + 'static> {
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Box::new(self)
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}
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default fn other(self) {}
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}
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impl<'a> Tr for &'a i32 {
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//~^ ERROR does not fulfill the required lifetime
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fn other(self) {}
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}
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fn promote_to_static<'a>(i: &'a i32) -> &'static i32 {
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*i.method().downcast().unwrap()
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}
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struct Wrapper<'a>(&'a i32);
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impl<'a> Tr for Wrapper<'a> {
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//~^ ERROR does not fulfill the required lifetime
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fn other(self) {}
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}
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fn promote_to_static_2<'a>(w: Wrapper<'a>) -> Wrapper<'static> {
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*w.method().downcast().unwrap()
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}
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fn main() {
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let i = Box::new(100_i32);
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let static_i: &'static i32 = promote_to_static(&*i);
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drop(i);
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println!("{}", *static_i);
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let j = Box::new(200_i32);
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let static_w: Wrapper<'static> = promote_to_static_2(Wrapper(&*j));
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drop(j);
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println!("{}", *static_w.0);
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}
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