55 lines
1.5 KiB
Rust
55 lines
1.5 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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#![allow(dead_code)]
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fn main() {}
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#[allow(clippy::unnecessary_operation)]
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fn starts_with() {
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"".chars().next() == Some(' ');
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Some(' ') != "".chars().next();
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}
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fn chars_cmp_with_unwrap() {
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let s = String::from("foo");
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if s.chars().next().unwrap() == 'f' {
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// s.starts_with('f')
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// Nothing here
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}
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if s.chars().next_back().unwrap() == 'o' {
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// s.ends_with('o')
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// Nothing here
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}
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if s.chars().last().unwrap() == 'o' {
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// s.ends_with('o')
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// Nothing here
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}
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if s.chars().next().unwrap() != 'f' {
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// !s.starts_with('f')
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// Nothing here
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}
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if s.chars().next_back().unwrap() != 'o' {
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// !s.ends_with('o')
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// Nothing here
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}
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if s.chars().last().unwrap() != 'o' {
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// !s.ends_with('o')
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// Nothing here
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}
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}
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#[allow(clippy::unnecessary_operation)]
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fn ends_with() {
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"".chars().last() == Some(' ');
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Some(' ') != "".chars().last();
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"".chars().next_back() == Some(' ');
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Some(' ') != "".chars().next_back();
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}
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