rust/src/test/codegen-units/item-collection/unsizing.rs

// Copyright 2012-2015 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.

// ignore-tidy-linelength
// compile-flags:-Zprint-trans-items=eager

#![deny(dead_code)]
#![feature(coerce_unsized)]
#![feature(unsize)]

use std::marker::Unsize;
use std::ops::CoerceUnsized;

trait Trait {
    fn foo(&self);
}

// Simple Case
impl Trait for bool {
    fn foo(&self) {}
}

impl Trait for char {
    fn foo(&self) {}
}

// Struct Field Case
struct Struct<T: ?Sized> {
    _a: u32,
    _b: i32,
    _c: T
}

impl Trait for f64 {
    fn foo(&self) {}
}

// Custom Coercion Case
impl Trait for u32 {
    fn foo(&self) {}
}

#[derive(Clone, Copy)]
struct Wrapper<T: ?Sized>(*const T);

impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Wrapper<U>> for Wrapper<T> {}

//~ TRANS_ITEM fn unsizing::main[0]
fn main()
{
    // simple case
    let bool_sized = &true;
    //~ TRANS_ITEM drop-glue i8
    //~ TRANS_ITEM fn unsizing::{{impl}}[0]::foo[0]
    let _bool_unsized = bool_sized as &Trait;

    let char_sized = &true;
    //~ TRANS_ITEM fn unsizing::{{impl}}[1]::foo[0]
    let _char_unsized = char_sized as &Trait;

    // struct field
    let struct_sized = &Struct {
        _a: 1,
        _b: 2,
        _c: 3.0f64
    };
    //~ TRANS_ITEM fn unsizing::{{impl}}[2]::foo[0]
    let _struct_unsized = struct_sized as &Struct<Trait>;

    // custom coercion
    let wrapper_sized = Wrapper(&0u32);
    //~ TRANS_ITEM fn unsizing::{{impl}}[3]::foo[0]
    let _wrapper_sized = wrapper_sized as Wrapper<Trait>;
}