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