mirror of https://github.com/rust-lang/rust
58 lines
1.5 KiB
Rust
58 lines
1.5 KiB
Rust
#![feature(const_trait_impl)]
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#![feature(c_variadic)]
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#![feature(effects)]
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#![feature(fn_delegation)]
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#![allow(incomplete_features)]
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mod opaque {
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trait Trait {}
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impl Trait for () {}
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mod to_reuse {
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use super::Trait;
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pub fn opaque_ret() -> impl Trait { unimplemented!() }
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//~^ warn: this function depends on never type fallback being `()`
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//~| warn: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
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}
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trait ToReuse {
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fn opaque_ret() -> impl Trait { unimplemented!() }
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//~^ warn: this function depends on never type fallback being `()`
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//~| warn: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
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}
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// FIXME: Inherited `impl Trait`s create query cycles when used inside trait impls.
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impl ToReuse for u8 {
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reuse to_reuse::opaque_ret; //~ ERROR cycle detected when computing type
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}
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impl ToReuse for u16 {
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reuse ToReuse::opaque_ret; //~ ERROR cycle detected when computing type
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}
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}
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mod recursive {
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mod to_reuse1 {
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pub mod to_reuse2 {
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pub fn foo() {}
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}
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pub reuse to_reuse2::foo;
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}
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reuse to_reuse1::foo;
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//~^ ERROR recursive delegation is not supported yet
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}
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mod effects {
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#[const_trait]
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trait Trait {
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fn foo();
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}
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reuse Trait::foo;
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//~^ ERROR delegation to a function with effect parameter is not supported yet
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}
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fn main() {}
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