dec36c3d6e
Current `transform_ty` attempts to avoid cycles when normalizing
`#[repr(transparent)]` types to their interior, but runs afoul of this
pattern used in `self_cell`:
```
struct X<T> {
x: u8,
p: PhantomData<T>,
}
#[repr(transparent)]
struct Y(X<Y>);
```
When attempting to normalize Y, it will still cycle indefinitely. By
using a types-visited list, this will instead get expanded exactly
one layer deep to X<Y>, and then stop, not attempting to normalize `Y`
any further.
34 lines
677 B
Rust
34 lines
677 B
Rust
// Check that encoding self-referential types works with #[repr(transparent)]
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//@ needs-sanitizer-cfi
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// FIXME(#122848) Remove only-linux once OSX CFI binaries work
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//@ only-linux
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//@ compile-flags: --crate-type=bin -Cprefer-dynamic=off -Clto -Zsanitizer=cfi
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//@ compile-flags: -C target-feature=-crt-static -C codegen-units=1 -C opt-level=0
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//@ run-pass
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use std::marker::PhantomData;
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struct X<T> {
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_x: u8,
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p: PhantomData<T>,
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}
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#[repr(transparent)]
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struct Y(X<Y>);
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trait Fooable {
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fn foo(&self, y: Y);
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}
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struct Bar;
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impl Fooable for Bar {
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fn foo(&self, _: Y) {}
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}
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fn main() {
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let x = &Bar as &dyn Fooable;
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x.foo(Y(X {_x: 0, p: PhantomData}));
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}
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