rust/src/libcore/clone.rs, branch 1.14.0

Remove stage0 hacks

2016-09-28T23:17:56+00:00

Rollup merge of #36384 - petrochenkov:derclone, r=alexcrichton

2016-09-15T12:46:19+00:00

Improve shallow `Clone` deriving `Copy` unions now support `#[derive(Clone)]`. Less code is generated for `#[derive(Clone, Copy)]`. + Unions now support `#[derive(Eq)]`. Less code is generated for `#[derive(Eq)]`. --- Example of code reduction: ``` enum E { A { a: u8, b: u16 }, B { c: [u8; 100] }, } ``` Before: ``` fn clone(&self) -> E { match (&*self,) { (&E::A { a: ref __self_0, b: ref __self_1 },) => { ::std::clone::assert_receiver_is_clone(&(*__self_0)); ::std::clone::assert_receiver_is_clone(&(*__self_1)); *self } (&E::B { c: ref __self_0 },) => { ::std::clone::assert_receiver_is_clone(&(*__self_0)); *self } } } ``` After: ``` fn clone(&self) -> E { { let _: ::std::clone::AssertParamIsClone; let _: ::std::clone::AssertParamIsClone; let _: ::std::clone::AssertParamIsClone<[u8; 100]>; *self } } ``` All the matches are removed, bound assertions are more lightweight. `let _: Checker;`, unlike `checker(&check_me);`, doesn't have to be translated by rustc_trans and then inlined by LLVM, it doesn't even exist in MIR, this means faster compilation. --- Union impls are generated like this: ``` union U { a: u8, b: u16, c: [u8; 100], } ``` ``` fn clone(&self) -> U { { let _: ::std::clone::AssertParamIsCopy; *self } } ``` Fixes https://github.com/rust-lang/rust/issues/36043 cc @durka r? @alexcrichton

Improve Clone doc

2016-09-11T09:58:17+00:00

Improve shallow `Clone` deriving

2016-09-10T15:43:27+00:00

Use `#[prelude_import]` in `libcore`.

2016-08-24T22:12:23+00:00

Prefer `ClassName` over `Self` in example trait implementations

2016-05-23T17:14:15+00:00

"more than 32" => "more than 32 elements"

2016-05-23T17:00:01+00:00

Emphasize semantic differences of Copy/Clone rather than impl

2016-05-23T16:58:42+00:00

Shorten, yet clarify, initial summary sentences

2016-05-23T16:53:42+00:00

Add more detail to `Clone`'s documentation

2016-05-23T14:03:44+00:00

Used as resources: - https://users.rust-lang.org/t/whats-the-difference-between-trait-copy-and-clone/2609/2?u=carols10cents