73 lines
1.8 KiB
Rust
73 lines
1.8 KiB
Rust
// Copyright 2019 The Fuchsia Authors
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//
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// Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
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// <LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0>, or the MIT
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// license <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option.
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// This file may not be copied, modified, or distributed except according to
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// those terms.
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// See comment in `include.rs` for why we disable the prelude.
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#![no_implicit_prelude]
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#![allow(warnings)]
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include!("include.rs");
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// A struct is `FromZeros` if:
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// - all fields are `FromZeros`
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#[derive(imp::FromZeros)]
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struct Zst;
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util_assert_impl_all!(Zst: imp::FromZeros);
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#[derive(imp::FromZeros)]
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struct One {
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a: bool,
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}
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util_assert_impl_all!(One: imp::FromZeros);
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#[derive(imp::FromZeros)]
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struct Two {
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a: bool,
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b: Zst,
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}
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util_assert_impl_all!(Two: imp::FromZeros);
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#[derive(imp::FromZeros)]
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struct Unsized {
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a: [u8],
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}
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util_assert_impl_all!(Unsized: imp::FromZeros);
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#[derive(imp::FromZeros)]
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struct TypeParams<'a, T: ?imp::Sized, I: imp::Iterator> {
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a: I::Item,
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b: u8,
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c: imp::PhantomData<&'a [u8]>,
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d: imp::PhantomData<&'static str>,
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e: imp::PhantomData<imp::String>,
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f: T,
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}
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util_assert_impl_all!(TypeParams<'static, (), imp::IntoIter<()>>: imp::FromZeros);
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util_assert_impl_all!(TypeParams<'static, util::AU16, imp::IntoIter<()>>: imp::FromZeros);
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util_assert_impl_all!(TypeParams<'static, [util::AU16], imp::IntoIter<()>>: imp::FromZeros);
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// Deriving `FromZeros` should work if the struct has bounded parameters.
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#[derive(imp::FromZeros)]
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#[repr(transparent)]
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struct WithParams<'a: 'b, 'b: 'a, T: 'a + 'b + imp::FromZeros, const N: usize>(
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[T; N],
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imp::PhantomData<&'a &'b ()>,
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)
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where
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'a: 'b,
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'b: 'a,
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T: 'a + 'b + imp::FromZeros;
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util_assert_impl_all!(WithParams<'static, 'static, u8, 42>: imp::FromZeros);
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