rust/src/test/run-pass/regions-no-variance-from-fn-generics.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

46 lines
1.3 KiB
Rust

// Copyright 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.
// Issue #12856: a lifetime formal binding introduced by a generic fn
// should not upset the variance inference for actual occurrences of
// that lifetime in type expressions.
pub trait HasLife<'a> { }
trait UseLife01 {
fn refs<'a, H: HasLife<'a>>(&'a self) -> H;
}
trait UseLife02 {
fn refs<'a, T, H: HasType<&'a T>>(&'a self) -> H;
}
pub trait HasType<T> { }
trait UseLife03<T> {
fn refs<'a, H: HasType<&'a T>>(&'a self) -> H;
}
// (The functions below were not actually a problem observed during
// fixing of #12856; they just seem like natural tests to put in to
// cover a couple more points in the testing space)
pub fn top_refs_1<'a, H: HasLife<'a>>(_s: &'a ()) -> H {
unimplemented!()
}
pub fn top_refs_2<'a, T, H: HasType<&'a T>>(_s: &'a ()) -> H {
unimplemented!()
}
pub fn main() {}