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Contract variables can be declared in the `requires` clause and can be referenced both in `requires` and `ensures`, subject to usual borrow checking rules. This allows any setup common to both the `requires` and `ensures` clauses to only be done once.
45 lines
1.2 KiB
Rust
45 lines
1.2 KiB
Rust
//@ revisions: unchk_pass unchk_fail_pre unchk_fail_post chk_pass chk_fail_pre chk_fail_post
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//
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//@ [unchk_pass] run-pass
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//@ [unchk_fail_pre] run-pass
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//@ [unchk_fail_post] run-pass
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//@ [chk_pass] run-pass
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//
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//@ [chk_fail_pre] run-crash
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//@ [chk_fail_post] run-crash
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//
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//@ [unchk_pass] compile-flags: -Zcontract-checks=no
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//@ [unchk_fail_pre] compile-flags: -Zcontract-checks=no
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//@ [unchk_fail_post] compile-flags: -Zcontract-checks=no
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//
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//@ [chk_pass] compile-flags: -Zcontract-checks=yes
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//@ [chk_fail_pre] compile-flags: -Zcontract-checks=yes
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//@ [chk_fail_post] compile-flags: -Zcontract-checks=yes
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#![feature(contracts_internals)]
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fn nest(x: Baz) -> i32
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contract_requires { x.baz > 0 }
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contract_ensures { |ret| *ret > 100 }
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{
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loop {
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return x.baz + 50;
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}
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}
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struct Baz { baz: i32 }
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const BAZ_PASS_PRE_POST: Baz = Baz { baz: 100 };
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#[cfg(any(unchk_fail_post, chk_fail_post))]
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const BAZ_FAIL_POST: Baz = Baz { baz: 10 };
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#[cfg(any(unchk_fail_pre, chk_fail_pre))]
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const BAZ_FAIL_PRE: Baz = Baz { baz: -10 };
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fn main() {
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assert_eq!(nest(BAZ_PASS_PRE_POST), 150);
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#[cfg(any(unchk_fail_pre, chk_fail_pre))]
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nest(BAZ_FAIL_PRE);
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#[cfg(any(unchk_fail_post, chk_fail_post))]
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nest(BAZ_FAIL_POST);
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}
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