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some extra test cases to cover in the borrow checker.
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// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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struct S; | ||
// Ensure S is moved, not copied, on assignment. | ||
impl Drop for S { fn drop(&mut self) { } } | ||
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// user-defined function "returning" bottom (i.e. no return at all). | ||
fn my_fail() -> ! { loop {} } | ||
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pub fn step(f: bool) { | ||
let mut g = S; | ||
let mut i = 0; | ||
loop | ||
{ | ||
if i > 10 { break; } else { i += 1; } | ||
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let _g = g; | ||
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if f { | ||
// re-initialize g, but only before restarting loop. | ||
g = S; | ||
continue; | ||
} | ||
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my_fail(); | ||
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// we never get here, so we do not need to re-initialize g. | ||
} | ||
} | ||
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pub fn main() { | ||
step(true); | ||
} |
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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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#[deriving(PartialEq, Show)] | ||
struct Partial<T> { x: T, y: T } | ||
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#[deriving(PartialEq, Show)] | ||
struct S { val: int } | ||
impl S { fn new(v: int) -> S { S { val: v } } } | ||
impl Drop for S { fn drop(&mut self) { } } | ||
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pub fn f<T>((b1, b2): (T, T), f: |T| -> T) -> Partial<T> { | ||
let p = Partial { x: b1, y: b2 }; | ||
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// Move of `p` is legal even though we are also moving `p.y`; the | ||
// `..p` moves all fields *except* `p.y` in this context. | ||
Partial { y: f(p.y), ..p } | ||
} | ||
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pub fn main() { | ||
let p = f((S::new(3), S::new(4)), |S { val: z }| S::new(z+1)); | ||
assert_eq!(p, Partial { x: S::new(3), y: S::new(5) }); | ||
} |
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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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#[deriving(PartialEq, Show)] | ||
struct Partial<T> { x: T, y: T } | ||
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#[deriving(PartialEq, Show)] | ||
struct S { val: int } | ||
impl S { fn new(v: int) -> S { S { val: v } } } | ||
impl Drop for S { fn drop(&mut self) { } } | ||
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type Two<T> = (Partial<T>, Partial<T>); | ||
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pub fn f<T>((b1, b2): (T, T), (b3, b4): (T, T), f: |T| -> T) -> Two<T> { | ||
let p = Partial { x: b1, y: b2 }; | ||
let q = Partial { x: b3, y: b4 }; | ||
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// Move of `q` is legal even though we have already moved `q.y`; | ||
// the `..q` moves all fields *except* `q.y` in this context. | ||
// Likewise, the move of `p.x` is legal for similar reasons. | ||
(Partial { x: f(q.y), ..p }, Partial { y: f(p.x), ..q }) | ||
} | ||
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pub fn main() { | ||
let two = f((S::new(1), S::new(3)), | ||
(S::new(5), S::new(7)), | ||
|S { val: z }| S::new(z+1)); | ||
assert_eq!(two, (Partial { x: S::new(8), y: S::new(3) }, | ||
Partial { x: S::new(5), y: S::new(2) })); | ||
} |