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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.
18 lines
388 B
Rust
18 lines
388 B
Rust
//@ run-pass
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#![feature(contracts)]
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//~^ WARN the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes [incomplete_features]
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extern crate core;
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use core::contracts::ensures;
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#[ensures(*x = 0; |_ret| true)]
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fn buggy_add(x: &mut u32, y: u32) {
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*x = *x + y;
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}
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fn main() {
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let mut x = 10;
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buggy_add(&mut x, 100);
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assert_eq!(x, 110);
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}
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