20 lines
355 B
Rust
20 lines
355 B
Rust
pub fn dec_read_dec(i: &mut i32) -> i32 {
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*i -= 1;
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let ret = *i;
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*i -= 1;
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ret
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}
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#[allow(trivially_copy_pass_by_ref)]
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pub fn minus_1(i: &i32) -> i32 {
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dec_read_dec(&mut i.clone())
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}
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fn main() {
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let mut i = 10;
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assert_eq!(minus_1(&i), 9);
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assert_eq!(i, 10);
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assert_eq!(dec_read_dec(&mut i), 9);
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assert_eq!(i, 8);
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}
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