mirror of
https://github.com/rust-lang/rust-clippy
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71 lines
2 KiB
Rust
71 lines
2 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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#![feature(tool_lints)]
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const THREE_BITS : i64 = 7;
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const EVEN_MORE_REDIRECTION : i64 = THREE_BITS;
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#[warn(clippy::bad_bit_mask)]
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#[allow(clippy::ineffective_bit_mask, clippy::identity_op, clippy::no_effect, clippy::unnecessary_operation)]
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fn main() {
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let x = 5;
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x & 0 == 0;
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x & 1 == 1; //ok, distinguishes bit 0
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x & 1 == 0; //ok, compared with zero
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x & 2 == 1;
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x | 0 == 0; //ok, equals x == 0 (maybe warn?)
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x | 1 == 3; //ok, equals x == 2 || x == 3
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x | 3 == 3; //ok, equals x <= 3
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x | 3 == 2;
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x & 1 > 1;
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x & 2 > 1; // ok, distinguishes x & 2 == 2 from x & 2 == 0
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x & 2 < 1; // ok, distinguishes x & 2 == 2 from x & 2 == 0
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x | 1 > 1; // ok (if a bit silly), equals x > 1
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x | 2 > 1;
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x | 2 <= 2; // ok (if a bit silly), equals x <= 2
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x & 192 == 128; // ok, tests for bit 7 and not bit 6
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x & 0xffc0 == 0xfe80; // ok
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// this also now works with constants
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x & THREE_BITS == 8;
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x | EVEN_MORE_REDIRECTION < 7;
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0 & x == 0;
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1 | x > 1;
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// and should now also match uncommon usage
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1 < 2 | x;
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2 == 3 | x;
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1 == x & 2;
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x | 1 > 2; // no error, because we allowed ineffective bit masks
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ineffective();
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}
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#[warn(clippy::ineffective_bit_mask)]
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#[allow(clippy::bad_bit_mask, clippy::no_effect, clippy::unnecessary_operation)]
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fn ineffective() {
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let x = 5;
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x | 1 > 3;
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x | 1 < 4;
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x | 1 <= 3;
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x | 1 >= 8;
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x | 1 > 2; // not an error (yet), better written as x >= 2
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x | 1 >= 7; // not an error (yet), better written as x >= 6
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x | 3 > 4; // not an error (yet), better written as x >= 4
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x | 4 <= 19;
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}
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