66c93ac8ba
Moves the CFI ui tests to the cfi directory and removes the cfi prefix from tests file names similarly to how the cfi codegen tests are organized.
45 lines
1.4 KiB
Rust
45 lines
1.4 KiB
Rust
//@ needs-sanitizer-cfi
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//@ compile-flags: -Ccodegen-units=1 -Clto -Ctarget-feature=-crt-static -Zsanitizer=cfi
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//@ no-prefer-dynamic
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//@ only-x86_64-unknown-linux-gnu
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//@ build-pass
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// See comment below for why this test exists.
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trait Tr<U> {
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type Projection;
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}
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impl<F, U> Tr<U> for F
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where
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F: Fn() -> U
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{
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type Projection = U;
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}
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fn test<B: Tr<U>, U>(b: B) -> B::Projection
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{
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todo!()
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}
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fn main() {
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fn rpit_fn() -> impl Sized {}
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// When CFI runs, it tries to compute the signature of the call. This
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// ends up giving us a signature of:
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// `fn test::<rpit_fn, ()>() -> <rpit_fn as Tr<()>>::Projection`,
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// where `rpit_fn` is the ZST FnDef for the function. However, we were
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// previously using a Reveal::UserFacing param-env. This means that the
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// `<rpit_fn as Tr<()>>::Projection` return type is impossible to normalize,
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// since it would require proving `rpit_fn: Fn() -> ()`, but we cannot
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// prove that the `impl Sized` opaque is `()` with a user-facing param-env.
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// This leads to a normalization error, and then an ICE.
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//
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// Side-note:
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// So why is the second generic of `test` "`()`", and not the
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// `impl Sized` since we inferred it from the return type of `rpit_fn`
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// during typeck? Well, that's because we're using the generics from the
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// terminator of the MIR, which has had the RevealAll pass performed on it.
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let _ = test(rpit_fn);
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}
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