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carbon-lang/executable_semantics/testdata/experimental_continuation9.carbon
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2021-05-17 08:15:07 -07:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Test that the read from x triggers an error because x is dead.
// This test also demonstrates how by-reference free-variable capture
// is dangerous and can happen inside continuations.
fn capture() -> __Continuation {
var Int x = 1;
__continuation k {
var Int y = x;
}
return k;
}
fn main() -> Int {
var __Continuation k = capture();
__run k; // error, lifetime of x is over
return 0;
}