src/test/compile-fail/issue-23046.rs

   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() {
  27     let ex = |x| {
  28         let_(add(x,x), |y| { //~ ERROR type annotations needed
  29             let_(add(x, x), |x|x)})};
  30 }