33 lines
1.2 KiB
Rust
33 lines
1.2 KiB
Rust
// Regression test for #97405.
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// In `good_generic_fn` the param `T` ends up in the substs of closures/coroutines,
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// but we should be able to prove `<Gen<T> as Iterator>::Item: 'static` without
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// requiring `T: 'static`
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// edition:2018
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// check-fail
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fn opaque<F>(_: F) -> impl Iterator { b"".iter() }
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fn assert_static<T: 'static>(_: T) {}
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fn good_generic_fn<T>() {
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// Previously, proving `<OpaqueTy<type_of(async {})> as Iterator>::Item: 'static`
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// used to require `T: 'static`.
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assert_static(opaque(async {}).next());
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assert_static(opaque(|| {}).next());
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assert_static(opaque(opaque(async {}).next()).next());
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}
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// This should fail because `T` ends up in the upvars of the closure.
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fn bad_generic_fn<T: Copy>(t: T) {
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assert_static(opaque(async move { t; }).next());
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//~^ ERROR the associated type `<impl Iterator as Iterator>::Item` may not live long enough
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assert_static(opaque(move || { t; }).next());
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//~^ ERROR the associated type `<impl Iterator as Iterator>::Item` may not live long enough
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assert_static(opaque(opaque(async move { t; }).next()).next());
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//~^ ERROR the associated type `<impl Iterator as Iterator>::Item` may not live long enough
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}
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fn main() {}
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