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Rollup merge of rust-lang#129364 - jswrenn:transmute-layout-errs, r=c…
…ompiler-errors safe transmute: gracefully bubble-up layout errors Changes `.unwrap()`s to `?` to avoid ICEs. Adds ui tests. Fixes rust-lang#129327 Tracking Issue: rust-lang#99571 r? `@compiler-errors`
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26 changes: 26 additions & 0 deletions
26
tests/ui/transmutability/malformed-program-gracefulness/unknown_dst_field.rs
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// An unknown destination type should be gracefully handled. | ||
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#![crate_type = "lib"] | ||
#![feature(transmutability)] | ||
#![allow(incomplete_features)] | ||
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mod assert { | ||
use std::mem::BikeshedIntrinsicFrom; | ||
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pub fn is_transmutable<Src, Dst>() | ||
where | ||
Dst: BikeshedIntrinsicFrom<Src> | ||
{} | ||
} | ||
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fn should_gracefully_handle_unknown_dst_field() { | ||
#[repr(C)] struct Src; | ||
#[repr(C)] struct Dst(Missing); //~ cannot find type | ||
assert::is_transmutable::<Src, Dst>(); //~ ERROR cannot be safely transmuted | ||
} | ||
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fn should_gracefully_handle_unknown_dst_ref_field() { | ||
#[repr(C)] struct Src(&'static Src); | ||
#[repr(C)] struct Dst(&'static Missing); //~ cannot find type | ||
assert::is_transmutable::<Src, Dst>(); //~ ERROR cannot be safely transmuted | ||
} |
46 changes: 46 additions & 0 deletions
46
tests/ui/transmutability/malformed-program-gracefulness/unknown_dst_field.stderr
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error[E0412]: cannot find type `Missing` in this scope | ||
--> $DIR/unknown_dst_field.rs:18:27 | ||
| | ||
LL | #[repr(C)] struct Dst(Missing); | ||
| ^^^^^^^ not found in this scope | ||
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error[E0412]: cannot find type `Missing` in this scope | ||
--> $DIR/unknown_dst_field.rs:24:36 | ||
| | ||
LL | #[repr(C)] struct Dst(&'static Missing); | ||
| ^^^^^^^ not found in this scope | ||
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error[E0277]: `should_gracefully_handle_unknown_dst_field::Src` cannot be safely transmuted into `should_gracefully_handle_unknown_dst_field::Dst` | ||
--> $DIR/unknown_dst_field.rs:19:36 | ||
| | ||
LL | assert::is_transmutable::<Src, Dst>(); | ||
| ^^^ `should_gracefully_handle_unknown_dst_field::Dst` has an unknown layout | ||
| | ||
note: required by a bound in `is_transmutable` | ||
--> $DIR/unknown_dst_field.rs:12:14 | ||
| | ||
LL | pub fn is_transmutable<Src, Dst>() | ||
| --------------- required by a bound in this function | ||
LL | where | ||
LL | Dst: BikeshedIntrinsicFrom<Src> | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable` | ||
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error[E0277]: `should_gracefully_handle_unknown_dst_ref_field::Src` cannot be safely transmuted into `should_gracefully_handle_unknown_dst_ref_field::Dst` | ||
--> $DIR/unknown_dst_field.rs:25:36 | ||
| | ||
LL | assert::is_transmutable::<Src, Dst>(); | ||
| ^^^ `should_gracefully_handle_unknown_dst_ref_field::Dst` has an unknown layout | ||
| | ||
note: required by a bound in `is_transmutable` | ||
--> $DIR/unknown_dst_field.rs:12:14 | ||
| | ||
LL | pub fn is_transmutable<Src, Dst>() | ||
| --------------- required by a bound in this function | ||
LL | where | ||
LL | Dst: BikeshedIntrinsicFrom<Src> | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_transmutable` | ||
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error: aborting due to 4 previous errors | ||
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Some errors have detailed explanations: E0277, E0412. | ||
For more information about an error, try `rustc --explain E0277`. |
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