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|
// Test that impl trait does not allow creating recursive types that are
// otherwise forbidden.
#![feature(generators)]
#![allow(unconditional_recursion)]
fn option(i: i32) -> impl Sized {
//~^ ERROR cannot resolve opaque type
if i < 0 { None } else { Some((option(i - 1), i)) }
}
fn tuple() -> impl Sized {
//~^ ERROR
(tuple(),)
}
fn array() -> impl Sized {
//~^ ERROR
[array()]
}
fn ptr() -> impl Sized {
//~^ ERROR
&ptr() as *const _
}
fn fn_ptr() -> impl Sized {
//~^ ERROR
fn_ptr as fn() -> _
}
fn closure_capture() -> impl Sized {
//~^ ERROR
let x = closure_capture();
move || {
x;
}
}
fn closure_ref_capture() -> impl Sized {
//~^ ERROR
let x = closure_ref_capture();
move || {
&x;
}
}
fn closure_sig() -> impl Sized {
//~^ ERROR
|| closure_sig()
}
fn generator_sig() -> impl Sized {
//~^ ERROR
|| generator_sig()
}
fn generator_capture() -> impl Sized {
//~^ ERROR
let x = generator_capture();
move || {
yield;
x;
}
}
fn substs_change<T: 'static>() -> impl Sized {
//~^ ERROR
(substs_change::<&T>(),)
}
fn generator_hold() -> impl Sized {
//~^ ERROR
move || {
let x = generator_hold();
yield;
x;
}
}
fn use_fn_ptr() -> impl Sized {
// OK, error already reported
fn_ptr()
}
fn mutual_recursion() -> impl Sync {
//~^ ERROR
mutual_recursion_b()
}
fn mutual_recursion_b() -> impl Sized {
//~^ ERROR
mutual_recursion()
}
fn main() {}
|
