| // Copyright 2017 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. |
| use std::fmt::Debug; |
| |
| fn fine(x: impl Into<u32>) -> impl Into<u32> { x } |
| |
| fn bad_in_ret_position(x: impl Into<u32>) -> impl Into<impl Debug> { x } |
| //~^ ERROR nested `impl Trait` is not allowed |
| |
| fn bad_in_fn_syntax(x: fn() -> impl Into<impl Debug>) {} |
| //~^ ERROR nested `impl Trait` is not allowed |
| //~^^ `impl Trait` not allowed |
| |
| fn bad_in_arg_position(_: impl Into<impl Debug>) { } |
| //~^ ERROR nested `impl Trait` is not allowed |
| |
| struct X; |
| impl X { |
| fn bad(x: impl Into<u32>) -> impl Into<impl Debug> { x } |
| //~^ ERROR nested `impl Trait` is not allowed |
| } |
| |
| fn allowed_in_assoc_type() -> impl Iterator<Item=impl Fn()> { |
| vec![|| println!("woot")].into_iter() |
| } |
| |
| fn allowed_in_ret_type() -> impl Fn() -> impl Into<u32> { |
| //~^ `impl Trait` not allowed |
| || 5 |
| } |
| |
| fn main() {} |
