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Compiler: Rename "object safe" to "dyn compatible" Completed T-lang FCP: https://github.com/rust-lang/lang-team/issues/286#issuecomment-2338905118. Tracking issue: https://github.com/rust-lang/rust/issues/130852 Excludes `compiler/rustc_codegen_cranelift` (to be filed separately). Includes Stable MIR. Regarding https://github.com/rust-lang/rust/labels/relnotes, I guess I will manually open a https://github.com/rust-lang/rust/labels/relnotes-tracking-issue since this change affects everything (compiler, library, tools, docs, books, everyday language). r? ghost
42 lines
1.6 KiB
Plaintext
42 lines
1.6 KiB
Plaintext
error[E0038]: the trait `Copy` cannot be made into an object
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--> $DIR/avoid-ice-on-warning-2.rs:4:13
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LL | fn id<F>(f: Copy) -> usize {
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| ^^^^ `Copy` cannot be made into an object
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= note: the trait cannot be made into an object because it requires `Self: Sized`
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= note: for a trait to be "dyn-compatible" 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>
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error[E0618]: expected function, found `(dyn Copy + 'static)`
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--> $DIR/avoid-ice-on-warning-2.rs:11:5
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LL | fn id<F>(f: Copy) -> usize {
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| - `f` has type `(dyn Copy + 'static)`
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...
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LL | f()
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| ^--
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| |
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| call expression requires function
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error[E0277]: the size for values of type `(dyn Copy + 'static)` cannot be known at compilation time
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--> $DIR/avoid-ice-on-warning-2.rs:4:13
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LL | fn id<F>(f: Copy) -> usize {
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| ^^^^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `(dyn Copy + 'static)`
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= help: unsized fn params are gated as an unstable feature
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help: you can use `impl Trait` as the argument type
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LL | fn id<F>(f: impl Copy) -> usize {
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| ++++
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn id<F>(f: &dyn Copy) -> usize {
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| ++++
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error: aborting due to 3 previous errors
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Some errors have detailed explanations: E0038, E0277, E0618.
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For more information about an error, try `rustc --explain E0038`.
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