36 lines
1.3 KiB
Rust
36 lines
1.3 KiB
Rust
// Copyright 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.
|
|
|
|
#![feature(default_type_parameter_fallback)]
|
|
|
|
use std::fmt::Debug;
|
|
|
|
// Example from the RFC
|
|
fn foo<F:Default=usize>() -> F { F::default() }
|
|
//~^ NOTE: a default was defined here...
|
|
|
|
fn bar<B:Debug=isize>(b: B) { println!("{:?}", b); }
|
|
//~^ NOTE: a second default was defined here...
|
|
|
|
fn main() {
|
|
// Here, F is instantiated with $0=uint
|
|
let x = foo();
|
|
//~^ ERROR: mismatched types
|
|
//~| expected type `usize`
|
|
//~| found type `isize`
|
|
//~| NOTE: conflicting type parameter defaults `usize` and `isize`
|
|
//~| NOTE: conflicting type parameter defaults `usize` and `isize`
|
|
//~| NOTE: ...that was applied to an unconstrained type variable here
|
|
|
|
// Here, B is instantiated with $1=uint, and constraint $0 <: $1 is added.
|
|
bar(x);
|
|
//~^ NOTE: ...that also applies to the same type variable here
|
|
}
|