86 lines
2.6 KiB
Rust
86 lines
2.6 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.
|
|
|
|
#![feature(macro_rules)]
|
|
|
|
use std::{option, cast};
|
|
|
|
// Iota-reduction is a rule in the Calculus of (Co-)Inductive Constructions,
|
|
// which "says that a destructor applied to an object built from a constructor
|
|
// behaves as expected". -- http://coq.inria.fr/doc/Reference-Manual006.html
|
|
//
|
|
// It's a little more complicated here, because of pointers and regions and
|
|
// trying to get assert failure messages that at least identify which case
|
|
// failed.
|
|
|
|
enum E<T> { Thing(int, T), Nothing((), ((), ()), [i8, ..0]) }
|
|
impl<T> E<T> {
|
|
fn is_none(&self) -> bool {
|
|
match *self {
|
|
Thing(..) => false,
|
|
Nothing(..) => true
|
|
}
|
|
}
|
|
fn get_ref<'r>(&'r self) -> (int, &'r T) {
|
|
match *self {
|
|
Nothing(..) => fail!("E::get_ref(Nothing::<{}>)", stringify!(T)),
|
|
Thing(x, ref y) => (x, y)
|
|
}
|
|
}
|
|
}
|
|
|
|
macro_rules! check_option {
|
|
($e:expr: $T:ty) => {{
|
|
check_option!($e: $T, |ptr| assert!(*ptr == $e));
|
|
}};
|
|
($e:expr: $T:ty, |$v:ident| $chk:expr) => {{
|
|
assert!(option::None::<$T>.is_none());
|
|
let e = $e;
|
|
let s_ = option::Some::<$T>(e);
|
|
let $v = s_.get_ref();
|
|
$chk
|
|
}}
|
|
}
|
|
|
|
macro_rules! check_fancy {
|
|
($e:expr: $T:ty) => {{
|
|
check_fancy!($e: $T, |ptr| assert!(*ptr == $e));
|
|
}};
|
|
($e:expr: $T:ty, |$v:ident| $chk:expr) => {{
|
|
assert!(Nothing::<$T>((), ((), ()), [23i8, ..0]).is_none());
|
|
let e = $e;
|
|
let t_ = Thing::<$T>(23, e);
|
|
match t_.get_ref() {
|
|
(23, $v) => { $chk }
|
|
_ => fail!("Thing::<{}>(23, {}).get_ref() != (23, _)",
|
|
stringify!($T), stringify!($e))
|
|
}
|
|
}}
|
|
}
|
|
|
|
macro_rules! check_type {
|
|
($($a:tt)*) => {{
|
|
check_option!($($a)*);
|
|
check_fancy!($($a)*);
|
|
}}
|
|
}
|
|
|
|
pub fn main() {
|
|
check_type!(&17: &int);
|
|
check_type!(~18: ~int);
|
|
check_type!(@19: @int);
|
|
check_type!(~"foo": ~str);
|
|
check_type!(vec!(20, 22): Vec<int> );
|
|
let mint: uint = unsafe { cast::transmute(main) };
|
|
check_type!(main: fn(), |pthing| {
|
|
assert!(mint == unsafe { cast::transmute(*pthing) })
|
|
});
|
|
}
|