rust/tests/ui/implicit_saturating_sub.rs

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//@run-rustfix
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#![allow(unused_assignments, unused_mut, clippy::assign_op_pattern)]
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#![warn(clippy::implicit_saturating_sub)]
use std::cmp::PartialEq;
use std::ops::SubAssign;
// Mock type
struct Mock;
impl PartialEq<u32> for Mock {
fn eq(&self, _: &u32) -> bool {
true
}
}
impl SubAssign<u32> for Mock {
fn sub_assign(&mut self, _: u32) {}
}
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fn main() {
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// Tests for unsigned integers
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let end_8: u8 = 10;
let start_8: u8 = 5;
let mut u_8: u8 = end_8 - start_8;
// Lint
if u_8 > 0 {
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u_8 = u_8 - 1;
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}
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match end_8 {
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10 => {
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// Lint
if u_8 > 0 {
u_8 -= 1;
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}
},
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11 => u_8 += 1,
_ => u_8 = 0,
}
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let end_16: u16 = 40;
let start_16: u16 = 35;
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let mut u_16: u16 = end_16 - start_16;
// Lint
if u_16 > 0 {
u_16 -= 1;
}
let mut end_32: u32 = 7010;
let mut start_32: u32 = 7000;
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let mut u_32: u32 = end_32 - start_32;
// Lint
if u_32 != 0 {
u_32 -= 1;
}
// No Lint
if u_32 > 0 {
u_16 += 1;
}
// No Lint
if u_32 != 0 {
end_32 -= 1;
start_32 += 1;
}
let mut end_64: u64 = 75001;
let mut start_64: u64 = 75000;
let mut u_64: u64 = end_64 - start_64;
// Lint
if u_64 > 0 {
u_64 -= 1;
}
// Lint
if 0 < u_64 {
u_64 -= 1;
}
// Lint
if 0 != u_64 {
u_64 -= 1;
}
// No Lint
if u_64 >= 1 {
u_64 -= 1;
}
// No Lint
if u_64 > 0 {
end_64 -= 1;
}
// Tests for usize
let end_usize: usize = 8054;
let start_usize: usize = 8050;
let mut u_usize: usize = end_usize - start_usize;
// Lint
if u_usize > 0 {
u_usize -= 1;
}
// Tests for signed integers
let endi_8: i8 = 10;
let starti_8: i8 = 50;
let mut i_8: i8 = endi_8 - starti_8;
// Lint
if i_8 > i8::MIN {
i_8 -= 1;
}
// Lint
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if i_8 > i8::MIN {
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i_8 -= 1;
}
// Lint
if i_8 != i8::MIN {
i_8 -= 1;
}
// Lint
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if i_8 != i8::MIN {
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i_8 -= 1;
}
let endi_16: i16 = 45;
let starti_16: i16 = 44;
let mut i_16: i16 = endi_16 - starti_16;
// Lint
if i_16 > i16::MIN {
i_16 -= 1;
}
// Lint
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if i_16 > i16::MIN {
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i_16 -= 1;
}
// Lint
if i_16 != i16::MIN {
i_16 -= 1;
}
// Lint
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if i_16 != i16::MIN {
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i_16 -= 1;
}
let endi_32: i32 = 45;
let starti_32: i32 = 44;
let mut i_32: i32 = endi_32 - starti_32;
// Lint
if i_32 > i32::MIN {
i_32 -= 1;
}
// Lint
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if i_32 > i32::MIN {
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i_32 -= 1;
}
// Lint
if i_32 != i32::MIN {
i_32 -= 1;
}
// Lint
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if i_32 != i32::MIN {
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i_32 -= 1;
}
let endi_64: i64 = 45;
let starti_64: i64 = 44;
let mut i_64: i64 = endi_64 - starti_64;
// Lint
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if i64::MIN < i_64 {
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i_64 -= 1;
}
// Lint
if i64::MIN != i_64 {
i_64 -= 1;
}
// Lint
if i64::MIN < i_64 {
i_64 -= 1;
}
// No Lint
if i_64 > 0 {
i_64 -= 1;
}
// No Lint
if i_64 != 0 {
i_64 -= 1;
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}
// issue #7831
// No Lint
if u_32 > 0 {
u_32 -= 1;
} else {
println!("side effect");
}
// Extended tests
let mut m = Mock;
let mut u_32 = 3000;
let a = 200;
let mut _b = 8;
if m != 0 {
m -= 1;
}
if a > 0 {
_b -= 1;
}
if 0 > a {
_b -= 1;
}
if u_32 > 0 {
u_32 -= 1;
} else {
println!("don't lint this");
}
if u_32 > 0 {
println!("don't lint this");
u_32 -= 1;
}
if u_32 > 42 {
println!("brace yourself!");
} else if u_32 > 0 {
u_32 -= 1;
}
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}