31 lines
782 B
Rust
31 lines
782 B
Rust
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() {}
|