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23 lines
573 B
Rust
23 lines
573 B
Rust
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//@ compile-flags: -Zcontract-checks=yes
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#![feature(rustc_contracts)]
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struct Baz {
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baz: i32
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}
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#[track_caller]
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#[core::contracts::requires(x.baz > 0)]
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#[core::contracts::ensures({let old = x; move |ret:&Baz| ret.baz == old.baz*2 })]
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// Relevant thing is this: ^^^^^^^^^^^
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// because we are capturing state that is non-Copy.
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//~^^^ ERROR trait bound `Baz: std::marker::Copy` is not satisfied
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fn doubler(x: Baz) -> Baz {
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Baz { baz: x.baz + 10 }
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}
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fn main() {
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assert_eq!(doubler(Baz { baz: 10 }).baz, 20);
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assert_eq!(doubler(Baz { baz: 100 }).baz, 200);
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}
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