74 lines
1.4 KiB
Rust
74 lines
1.4 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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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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fn input(_: Option<Option<u8>>) {
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}
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fn output() -> Option<Option<u8>> {
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None
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}
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fn output_nested() -> Vec<Option<Option<u8>>> {
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vec![None]
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}
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// The lint only generates one warning for this
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fn output_nested_nested() -> Option<Option<Option<u8>>> {
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None
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}
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struct Struct {
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x: Option<Option<u8>>,
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}
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impl Struct {
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fn struct_fn() -> Option<Option<u8>> {
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None
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}
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}
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trait Trait {
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fn trait_fn() -> Option<Option<u8>>;
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}
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enum Enum {
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Tuple(Option<Option<u8>>),
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Struct{x: Option<Option<u8>>},
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}
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// The lint allows this
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type OptionOption = Option<Option<u32>>;
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// The lint allows this
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fn output_type_alias() -> OptionOption {
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None
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}
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// The line allows this
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impl Trait for Struct {
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fn trait_fn() -> Option<Option<u8>> {
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None
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}
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}
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fn main() {
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input(None);
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output();
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output_nested();
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// The lint allows this
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let local: Option<Option<u8>> = None;
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// The lint allows this
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let expr = Some(Some(true));
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}
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