rust/src/test/compile-fail/issue-3344.rs
Steven Fackler 55cae0a094 Implement RFC#28: Add PartialOrd::partial_cmp
I ended up altering the semantics of Json's PartialOrd implementation.
It used to be the case that Null < Null, but I can't think of any reason
for an ordering other than the default one so I just switched it over to
using the derived implementation.

This also fixes broken `PartialOrd` implementations for `Vec` and
`TreeMap`.

RFC: 0028-partial-cmp
2014-06-29 21:42:09 -07:00

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Rust

// Copyright 2012 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.
#[deriving(PartialEq)]
struct thing(uint);
impl PartialOrd for thing { //~ ERROR not all trait methods implemented, missing: `partial_cmp`
fn le(&self, other: &thing) -> bool { true }
fn ge(&self, other: &thing) -> bool { true }
}
fn main() {}