72 lines
2.2 KiB
Rust
72 lines
2.2 KiB
Rust
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! A simple test for testing many permutations of allowedness of
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//! impl Trait
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#![feature(conservative_impl_trait, universal_impl_trait, dyn_trait)]
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use std::fmt::Debug;
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// Allowed
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fn simple_universal(_: impl Debug) { panic!() }
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// Allowed
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fn simple_existential() -> impl Debug { panic!() }
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// Allowed
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fn collection_universal(_: Vec<impl Debug>) { panic!() }
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// Allowed
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fn collection_existential() -> Vec<impl Debug> { panic!() }
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// Disallowed
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fn fn_type_universal(_: fn(impl Debug)) { panic!() }
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//~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
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// Disallowed
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fn fn_type_existential() -> fn(impl Debug) { panic!() }
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//~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
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// Allowed
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fn dyn_universal(_: &dyn Iterator<Item = impl Debug>) { panic!() }
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// Disallowed
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fn dyn_fn_trait(_: &dyn Fn(impl Debug)) { panic!() }
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//~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
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// Allowed
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fn nested_universal(_: impl Iterator<Item = impl Iterator>) { panic!() }
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// Allowed
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fn nested_existential() -> impl IntoIterator<Item = impl IntoIterator> {
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vec![vec![0; 10], vec![12; 7], vec![8; 3]]
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}
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// Disallowed
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fn universal_fn_trait(_: impl Fn(impl Debug)) { panic!() }
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//~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
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// Disallowed
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struct ImplMember { x: impl Debug }
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//~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
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// Disallowed
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trait Universal {
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// FIXME, should error?
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fn universal(impl Debug);
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}
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// Disallowed
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trait Existential {
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fn existential() -> impl Debug;
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//~^ ERROR `impl Trait` not allowed outside of function and inherent method return types
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}
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fn main() {}
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