68 lines
1.7 KiB
Rust
68 lines
1.7 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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#![warn(clippy::for_loop_over_option, clippy::for_loop_over_result)]
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/// Tests for_loop_over_result and for_loop_over_option
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fn for_loop_over_option_and_result() {
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let option = Some(1);
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let result = option.ok_or("x not found");
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let v = vec![0, 1, 2];
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// check FOR_LOOP_OVER_OPTION lint
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for x in option {
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println!("{}", x);
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}
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// check FOR_LOOP_OVER_RESULT lint
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for x in result {
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println!("{}", x);
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}
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for x in option.ok_or("x not found") {
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println!("{}", x);
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}
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// make sure LOOP_OVER_NEXT lint takes clippy::precedence when next() is the last call
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// in the chain
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for x in v.iter().next() {
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println!("{}", x);
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}
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// make sure we lint when next() is not the last call in the chain
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for x in v.iter().next().and(Some(0)) {
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println!("{}", x);
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}
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for x in v.iter().next().ok_or("x not found") {
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println!("{}", x);
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}
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// check for false positives
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// for loop false positive
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for x in v {
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println!("{}", x);
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}
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// while let false positive for Option
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while let Some(x) = option {
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println!("{}", x);
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break;
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}
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// while let false positive for Result
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while let Ok(x) = result {
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println!("{}", x);
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break;
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}
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}
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fn main() {}
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