mirror of https://github.com/rust-lang/rust.git
40 lines
1.1 KiB
Rust
40 lines
1.1 KiB
Rust
//@revisions: string unit atomic
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#![feature(type_alias_impl_trait)]
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//! Check that we do not cause cycle errors when trying to
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//! obtain information about interior mutability of an opaque type.
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//! This used to happen, because when the body-analysis failed, we
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//! checked the type instead, but the constant was also defining the
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//! hidden type of the opaque type. Thus we ended up relying on the
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//! result of our analysis to compute the result of our analysis.
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//@[unit] check-pass
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mod helper {
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pub type Foo = impl Sized;
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#[cfg(string)]
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pub const FOO: Foo = String::new();
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#[cfg(atomic)]
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pub const FOO: Foo = std::sync::atomic::AtomicU8::new(42);
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#[cfg(unit)]
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pub const FOO: Foo = ();
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}
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use helper::*;
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const BAR: () = {
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let _: &'static _ = &FOO;
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//[string,atomic]~^ ERROR: destructor of `helper::Foo` cannot be evaluated at compile-time
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//[atomic]~| ERROR: cannot borrow here
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};
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const BAZ: &Foo = &FOO;
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//[atomic]~^ ERROR: constants cannot refer to interior mutable data
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fn main() {
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let _: &'static _ = &FOO;
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//[string,atomic]~^ ERROR: temporary value dropped while borrowed
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}
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