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// build-fail
// compile-flags:-Zpolymorphize=on -Zinline-mir=off
#![feature(generic_const_exprs, generators, generator_trait, rustc_attrs)]
//~^ WARN the feature `generic_const_exprs` is incomplete
use std::marker::Unpin;
use std::ops::{Generator, GeneratorState};
use std::pin::Pin;
enum YieldOrReturn<Y, R> {
Yield(Y),
Return(R),
}
fn finish<T, Y, R>(mut t: T) -> Vec<YieldOrReturn<Y, R>>
where
T: Generator<(), Yield = Y, Return = R> + Unpin,
{
let mut results = Vec::new();
loop {
match Pin::new(&mut t).resume(()) {
GeneratorState::Yielded(yielded) => results.push(YieldOrReturn::Yield(yielded)),
GeneratorState::Complete(returned) => {
results.push(YieldOrReturn::Return(returned));
return results;
}
}
}
}
// This test checks that the polymorphization analysis functions on generators.
#[rustc_polymorphize_error]
pub fn unused_type<T>() -> impl Generator<(), Yield = u32, Return = u32> + Unpin {
|| {
//~^ ERROR item has unused generic parameters
yield 1;
2
}
}
#[rustc_polymorphize_error]
pub fn used_type_in_yield<Y: Default>() -> impl Generator<(), Yield = Y, Return = u32> + Unpin {
|| {
yield Y::default();
2
}
}
#[rustc_polymorphize_error]
pub fn used_type_in_return<R: Default>() -> impl Generator<(), Yield = u32, Return = R> + Unpin {
|| {
yield 3;
R::default()
}
}
#[rustc_polymorphize_error]
pub fn unused_const<const T: u32>() -> impl Generator<(), Yield = u32, Return = u32> + Unpin {
|| {
//~^ ERROR item has unused generic parameters
yield 1;
2
}
}
#[rustc_polymorphize_error]
pub fn used_const_in_yield<const Y: u32>() -> impl Generator<(), Yield = u32, Return = u32> + Unpin
{
|| {
yield Y;
2
}
}
#[rustc_polymorphize_error]
pub fn used_const_in_return<const R: u32>() -> impl Generator<(), Yield = u32, Return = u32> + Unpin
{
|| {
yield 4;
R
}
}
fn main() {
finish(unused_type::<u32>());
finish(used_type_in_yield::<u32>());
finish(used_type_in_return::<u32>());
finish(unused_const::<1u32>());
finish(used_const_in_yield::<1u32>());
finish(used_const_in_return::<1u32>());
}
|
