40 lines
1.2 KiB
Rust
40 lines
1.2 KiB
Rust
// 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() {}
|