| #![feature(impl_trait_in_fn_trait_return)] | |
| 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 | |
| //~| ERROR the trait bound `impl Debug: From<impl Into<u32>>` is not satisfied | |
| fn bad_in_fn_syntax(x: fn() -> impl Into<impl Debug>) {} | |
| //~^ ERROR nested `impl Trait` is not allowed | |
| //~| ERROR `impl Trait` is not allowed in `fn` pointer | |
| 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 | |
| //~| ERROR the trait bound `impl Debug: From<impl Into<u32>>` is not satisfied | |
| } | |
| 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> { | |
| || 5u8 | |
| } | |
| fn main() {} |