25 lines
1.1 KiB
Rust
25 lines
1.1 KiB
Rust
//! Unstable module containing the unstable contracts lang items and attribute macros.
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pub use crate::macros::builtin::{contracts_ensures as ensures, contracts_requires as requires};
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/// This is an identity function used as part of the desugaring of the `#[ensures]` attribute.
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///
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/// This is an existing hack to allow users to omit the type of the return value in their ensures
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/// attribute.
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///
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/// Ideally, rustc should be able to generate the type annotation.
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/// The existing lowering logic makes it rather hard to add the explicit type annotation,
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/// while the function call is fairly straight forward.
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#[unstable(feature = "contracts_internals", issue = "128044" /* compiler-team#759 */)]
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// Similar to `contract_check_requires`, we need to use the user-facing
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// `contracts` feature rather than the perma-unstable `contracts_internals`.
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// Const-checking doesn't honor allow_internal_unstable logic used by contract expansion.
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#[rustc_const_unstable(feature = "contracts", issue = "128044")]
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#[lang = "contract_build_check_ensures"]
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pub const fn build_check_ensures<Ret, C>(cond: C) -> C
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where
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C: Fn(&Ret) -> bool + Copy + 'static,
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{
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cond
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}
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