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Diffstat (limited to '')
| -rw-r--r-- | src/test/ui/wf/wf-unsafe-trait-obj-match.stderr | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/test/ui/wf/wf-unsafe-trait-obj-match.stderr b/src/test/ui/wf/wf-unsafe-trait-obj-match.stderr new file mode 100644 index 000000000..6d141a58e --- /dev/null +++ b/src/test/ui/wf/wf-unsafe-trait-obj-match.stderr @@ -0,0 +1,54 @@ +error[E0308]: `match` arms have incompatible types + --> $DIR/wf-unsafe-trait-obj-match.rs:23:17 + | +LL | / match opt() { +LL | | Some(()) => &S, + | | -- this is found to be of type `&S` +LL | | None => &R, + | | ^^ expected struct `S`, found struct `R` +LL | | } + | |_____- `match` arms have incompatible types + | + = note: expected reference `&S` + found reference `&R` + +error[E0038]: the trait `Trait` cannot be made into an object + --> $DIR/wf-unsafe-trait-obj-match.rs:26:21 + | +LL | Some(()) => &S, + | ^^ `Trait` cannot be made into an object + | +note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety> + --> $DIR/wf-unsafe-trait-obj-match.rs:6:14 + | +LL | trait Trait: Sized {} + | ----- ^^^^^ ...because it requires `Self: Sized` + | | + | this trait cannot be made into an object... + = note: required because of the requirements on the impl of `CoerceUnsized<&dyn Trait>` for `&S` + = note: required by cast to type `&dyn Trait` + +error[E0038]: the trait `Trait` cannot be made into an object + --> $DIR/wf-unsafe-trait-obj-match.rs:25:25 + | +LL | let t: &dyn Trait = match opt() { + | _________________________^ +LL | | Some(()) => &S, +LL | | None => &R, +LL | | }; + | |_____^ `Trait` cannot be made into an object + | +note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety> + --> $DIR/wf-unsafe-trait-obj-match.rs:6:14 + | +LL | trait Trait: Sized {} + | ----- ^^^^^ ...because it requires `Self: Sized` + | | + | this trait cannot be made into an object... + = note: required because of the requirements on the impl of `CoerceUnsized<&dyn Trait>` for `&R` + = note: required by cast to type `&dyn Trait` + +error: aborting due to 3 previous errors + +Some errors have detailed explanations: E0038, E0308. +For more information about an error, try `rustc --explain E0038`. |