2014-12-05 13:17:35 -06:00
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// Copyright 2012-2014 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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#![crate_name = "rustc_borrowck"]
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#![experimental]
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#![crate_type = "dylib"]
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#![crate_type = "rlib"]
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#![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
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html_favicon_url = "http://www.rust-lang.org/favicon.ico",
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html_root_url = "http://doc.rust-lang.org/nightly/")]
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Fix orphan checking (cc #19470). (This is not a complete fix of #19470 because of the backwards compatibility feature gate.)
This is a [breaking-change]. The new rules require that, for an impl of a trait defined
in some other crate, two conditions must hold:
1. Some type must be local.
2. Every type parameter must appear "under" some local type.
Here are some examples that are legal:
```rust
struct MyStruct<T> { ... }
// Here `T` appears "under' `MyStruct`.
impl<T> Clone for MyStruct<T> { }
// Here `T` appears "under' `MyStruct` as well. Note that it also appears
// elsewhere.
impl<T> Iterator<T> for MyStruct<T> { }
```
Here is an illegal example:
```rust
// Here `U` does not appear "under" `MyStruct` or any other local type.
// We call `U` "uncovered".
impl<T,U> Iterator<U> for MyStruct<T> { }
```
There are a couple of ways to rewrite this last example so that it is
legal:
1. In some cases, the uncovered type parameter (here, `U`) should be converted
into an associated type. This is however a non-local change that requires access
to the original trait. Also, associated types are not fully baked.
2. Add `U` as a type parameter of `MyStruct`:
```rust
struct MyStruct<T,U> { ... }
impl<T,U> Iterator<U> for MyStruct<T,U> { }
```
3. Create a newtype wrapper for `U`
```rust
impl<T,U> Iterator<Wrapper<U>> for MyStruct<T,U> { }
```
Because associated types are not fully baked, which in the case of the
`Hash` trait makes adhering to this rule impossible, you can
temporarily disable this rule in your crate by using
`#![feature(old_orphan_check)]`. Note that the `old_orphan_check`
feature will be removed before 1.0 is released.
2014-12-26 02:30:51 -06:00
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#![allow(unknown_features)]
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2015-01-06 11:24:46 -06:00
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#![feature(quote)]
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2014-12-15 08:01:26 -06:00
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#![feature(slicing_syntax, unsafe_destructor)]
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2014-12-05 13:17:35 -06:00
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#![feature(rustc_diagnostic_macros)]
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#![allow(non_camel_case_types)]
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2015-01-06 11:24:46 -06:00
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#[macro_use] extern crate log;
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#[macro_use] extern crate syntax;
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2014-12-05 13:17:35 -06:00
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// for "clarity", rename the graphviz crate to dot; graphviz within `borrowck`
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// refers to the borrowck-specific graphviz adapter traits.
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extern crate "graphviz" as dot;
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extern crate rustc;
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pub use borrowck::check_crate;
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pub use borrowck::build_borrowck_dataflow_data_for_fn;
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pub use borrowck::FnPartsWithCFG;
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mod borrowck;
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pub mod graphviz;
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