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1 | // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | pub enum Expr<'var, VAR> { | |
12 | Let(Box<Expr<'var, VAR>>, | |
13 | Box<for<'v: 'var> Fn(Expr<'v, VAR>) -> Expr<'v, VAR> + 'var>) | |
14 | } | |
15 | ||
16 | pub fn add<'var, VAR> | |
17 | (a: Expr<'var, VAR>, b: Expr<'var, VAR>) -> Expr<'var, VAR> { | |
18 | loop {} | |
19 | } | |
20 | ||
21 | pub fn let_<'var, VAR, F: for<'v: 'var> Fn(Expr<'v, VAR>) -> Expr<'v, VAR>> | |
22 | (a: Expr<'var, VAR>, b: F) -> Expr<'var, VAR> { | |
23 | loop {} | |
24 | } | |
25 | ||
26 | fn main() { | |
b039eaaf | 27 | let ex = |x| { |
8bb4bdeb | 28 | let_(add(x,x), |y| { //~ ERROR type annotations needed |
b039eaaf | 29 | let_(add(x, x), |x|x)})}; |
e9174d1e | 30 | } |