096a28607f
This change makes the compiler no longer infer whether types (structures
and enumerations) implement the `Copy` trait (and thus are implicitly
copyable). Rather, you must implement `Copy` yourself via `impl Copy for
MyType {}`.
A new warning has been added, `missing_copy_implementations`, to warn
you if a non-generic public type has been added that could have
implemented `Copy` but didn't.
For convenience, you may *temporarily* opt out of this behavior by using
`#![feature(opt_out_copy)]`. Note though that this feature gate will never be
accepted and will be removed by the time that 1.0 is released, so you should
transition your code away from using it.
This breaks code like:
#[deriving(Show)]
struct Point2D {
x: int,
y: int,
}
fn main() {
let mypoint = Point2D {
x: 1,
y: 1,
};
let otherpoint = mypoint;
println!("{}{}", mypoint, otherpoint);
}
Change this code to:
#[deriving(Show)]
struct Point2D {
x: int,
y: int,
}
impl Copy for Point2D {}
fn main() {
let mypoint = Point2D {
x: 1,
y: 1,
};
let otherpoint = mypoint;
println!("{}{}", mypoint, otherpoint);
}
This is the backwards-incompatible part of #13231.
Part of RFC #3.
[breaking-change]
163 lines
3.8 KiB
Rust
163 lines
3.8 KiB
Rust
// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// ignore-android: FIXME(#10381)
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// min-lldb-version: 310
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// compile-flags:-g
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// === GDB TESTS ===================================================================================
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// gdb-command:print 'c-style-enum::SINGLE_VARIANT'
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// gdb-check:$1 = TheOnlyVariant
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// gdb-command:print 'c-style-enum::AUTO_ONE'
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// gdb-check:$2 = One
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// gdb-command:print 'c-style-enum::AUTO_TWO'
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// gdb-check:$3 = One
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// gdb-command:print 'c-style-enum::AUTO_THREE'
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// gdb-check:$4 = One
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// gdb-command:print 'c-style-enum::MANUAL_ONE'
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// gdb-check:$5 = OneHundred
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// gdb-command:print 'c-style-enum::MANUAL_TWO'
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// gdb-check:$6 = OneHundred
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// gdb-command:print 'c-style-enum::MANUAL_THREE'
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// gdb-check:$7 = OneHundred
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// gdb-command:run
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// gdb-command:print auto_one
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// gdb-check:$8 = One
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// gdb-command:print auto_two
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// gdb-check:$9 = Two
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// gdb-command:print auto_three
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// gdb-check:$10 = Three
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// gdb-command:print manual_one_hundred
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// gdb-check:$11 = OneHundred
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// gdb-command:print manual_one_thousand
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// gdb-check:$12 = OneThousand
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// gdb-command:print manual_one_million
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// gdb-check:$13 = OneMillion
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// gdb-command:print single_variant
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// gdb-check:$14 = TheOnlyVariant
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// gdb-command:print 'c-style-enum::AUTO_TWO'
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// gdb-check:$15 = Two
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// gdb-command:print 'c-style-enum::AUTO_THREE'
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// gdb-check:$16 = Three
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// gdb-command:print 'c-style-enum::MANUAL_TWO'
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// gdb-check:$17 = OneThousand
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// gdb-command:print 'c-style-enum::MANUAL_THREE'
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// gdb-check:$18 = OneMillion
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// === LLDB TESTS ==================================================================================
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// lldb-command:run
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// lldb-command:print auto_one
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// lldb-check:[...]$0 = One
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// lldb-command:print auto_two
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// lldb-check:[...]$1 = Two
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// lldb-command:print auto_three
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// lldb-check:[...]$2 = Three
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// lldb-command:print manual_one_hundred
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// lldb-check:[...]$3 = OneHundred
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// lldb-command:print manual_one_thousand
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// lldb-check:[...]$4 = OneThousand
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// lldb-command:print manual_one_million
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// lldb-check:[...]$5 = OneMillion
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// lldb-command:print single_variant
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// lldb-check:[...]$6 = TheOnlyVariant
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#![allow(unused_variables)]
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#![allow(dead_code)]
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use self::AutoDiscriminant::{One, Two, Three};
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use self::ManualDiscriminant::{OneHundred, OneThousand, OneMillion};
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use self::SingleVariant::TheOnlyVariant;
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#[deriving(Copy)]
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enum AutoDiscriminant {
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One,
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Two,
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Three
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}
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#[deriving(Copy)]
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enum ManualDiscriminant {
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OneHundred = 100,
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OneThousand = 1000,
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OneMillion = 1000000
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}
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#[deriving(Copy)]
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enum SingleVariant {
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TheOnlyVariant
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}
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static SINGLE_VARIANT: SingleVariant = TheOnlyVariant;
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static mut AUTO_ONE: AutoDiscriminant = One;
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static mut AUTO_TWO: AutoDiscriminant = One;
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static mut AUTO_THREE: AutoDiscriminant = One;
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static mut MANUAL_ONE: ManualDiscriminant = OneHundred;
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static mut MANUAL_TWO: ManualDiscriminant = OneHundred;
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static mut MANUAL_THREE: ManualDiscriminant = OneHundred;
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fn main() {
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let auto_one = One;
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let auto_two = Two;
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let auto_three = Three;
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let manual_one_hundred = OneHundred;
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let manual_one_thousand = OneThousand;
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let manual_one_million = OneMillion;
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let single_variant = TheOnlyVariant;
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unsafe {
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AUTO_TWO = Two;
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AUTO_THREE = Three;
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MANUAL_TWO = OneThousand;
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MANUAL_THREE = OneMillion;
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};
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zzz(); // #break
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let a = SINGLE_VARIANT;
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let a = unsafe { AUTO_ONE };
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let a = unsafe { MANUAL_ONE };
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}
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fn zzz() { () }
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