28 lines
882 B
Rust
28 lines
882 B
Rust
// 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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use std::cell::Cell;
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const NONE_CELL_STRING: Option<Cell<String>> = None;
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struct Foo<T>(T);
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impl<T> Foo<T> {
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const FOO: Option<Box<T>> = None;
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}
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fn main() {
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let _: &'static u32 = &42;
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let _: &'static Option<u32> = &None;
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// We should be able to peek at consts and see they're None.
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let _: &'static Option<Cell<String>> = &NONE_CELL_STRING;
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let _: &'static Option<Box<()>> = &Foo::FOO;
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}
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