rust/src/test/run-pass/struct-partial-move-2.rs
Patrick Walton e9ad12c0ca librustc: Forbid private types in public APIs.
This breaks code like:

    struct Foo {
        ...
    }

    pub fn make_foo() -> Foo {
        ...
    }

Change this code to:

    pub struct Foo {    // note `pub`
        ...
    }

    pub fn make_foo() -> Foo {
        ...
    }

The `visible_private_types` lint has been removed, since it is now an
error to attempt to expose a private type in a public API. In its place
a `#[feature(visible_private_types)]` gate has been added.

Closes #16463.

RFC #48.

[breaking-change]
2014-09-22 20:05:45 -07:00

38 lines
1.4 KiB
Rust

// 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.
#[deriving(PartialEq, Show)]
pub struct Partial<T> { x: T, y: T }
#[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) { } }
pub type Two<T> = (Partial<T>, Partial<T>);
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 };
// 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 })
}
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) }));
}