6a6c6b891b
The extended syntax for function signature that includes contract clauses should never be user exposed versus the interface we want to ship externally eventually.
38 lines
1.5 KiB
Rust
38 lines
1.5 KiB
Rust
//! Unstable module containing the unstable contracts lang items and attribute macros.
|
|
|
|
#[cfg(not(bootstrap))]
|
|
pub use crate::macros::builtin::contracts_ensures as ensures;
|
|
#[cfg(not(bootstrap))]
|
|
pub use crate::macros::builtin::contracts_requires as requires;
|
|
|
|
/// Emitted by rustc as a desugaring of `#[requires(PRED)] fn foo(x: X) { ... }`
|
|
/// into: `fn foo(x: X) { check_requires(|| PRED) ... }`
|
|
#[cfg(not(bootstrap))]
|
|
#[unstable(feature = "rustc_contracts_internals", issue = "133866" /* compiler-team#759 */)]
|
|
#[lang = "contract_check_requires"]
|
|
#[track_caller]
|
|
pub fn check_requires<C: FnOnce() -> bool>(c: C) {
|
|
if core::intrinsics::contract_checks() {
|
|
assert!(core::intrinsics::contract_check_requires(c), "failed requires check");
|
|
}
|
|
}
|
|
|
|
/// Emitted by rustc as a desugaring of `#[ensures(PRED)] fn foo() -> R { ... [return R;] ... }`
|
|
/// into: `fn foo() { let _check = build_check_ensures(|ret| PRED) ... [return _check(R);] ... }`
|
|
/// (including the implicit return of the tail expression, if any).
|
|
#[cfg(not(bootstrap))]
|
|
#[unstable(feature = "rustc_contracts_internals", issue = "133866" /* compiler-team#759 */)]
|
|
#[lang = "contract_build_check_ensures"]
|
|
#[track_caller]
|
|
pub fn build_check_ensures<Ret, C>(c: C) -> impl (FnOnce(Ret) -> Ret) + Copy
|
|
where
|
|
C: for<'a> FnOnce(&'a Ret) -> bool + Copy + 'static,
|
|
{
|
|
#[track_caller]
|
|
move |ret| {
|
|
if core::intrinsics::contract_checks() {
|
|
assert!(core::intrinsics::contract_check_ensures(&ret, c), "failed ensures check");
|
|
}
|
|
ret
|
|
}
|
|
}
|