40ae34194c
detects redundant imports that can be eliminated. for #117772 : In order to facilitate review and modification, split the checking code and removing redundant imports code into two PR.
59 lines
1.7 KiB
Rust
59 lines
1.7 KiB
Rust
use super::*;
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#[derive(Debug)]
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struct S(u32);
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impl PartialEq for S {
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fn eq(&self, _other: &Self) -> bool {
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panic!("shouldn't be called");
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}
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}
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impl Eq for S {}
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impl PartialOrd for S {
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fn partial_cmp(&self, other: &S) -> Option<Ordering> {
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// The `==` case should be handled by `Interned`.
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assert_ne!(self.0, other.0);
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self.0.partial_cmp(&other.0)
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}
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}
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impl Ord for S {
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fn cmp(&self, other: &S) -> Ordering {
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// The `==` case should be handled by `Interned`.
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assert_ne!(self.0, other.0);
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self.0.cmp(&other.0)
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}
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}
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#[test]
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fn test_uniq() {
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let s1 = S(1);
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let s2 = S(2);
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let s3 = S(3);
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let s4 = S(1); // violates uniqueness
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let v1 = Interned::new_unchecked(&s1);
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let v2 = Interned::new_unchecked(&s2);
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let v3a = Interned::new_unchecked(&s3);
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let v3b = Interned::new_unchecked(&s3);
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let v4 = Interned::new_unchecked(&s4); // violates uniqueness
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assert_ne!(v1, v2);
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assert_ne!(v2, v3a);
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assert_eq!(v1, v1);
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assert_eq!(v3a, v3b);
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assert_ne!(v1, v4); // same content but different addresses: not equal
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assert_eq!(v1.cmp(&v2), Ordering::Less);
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assert_eq!(v3a.cmp(&v2), Ordering::Greater);
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assert_eq!(v1.cmp(&v1), Ordering::Equal); // only uses Interned::eq, not S::cmp
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assert_eq!(v3a.cmp(&v3b), Ordering::Equal); // only uses Interned::eq, not S::cmp
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assert_eq!(v1.partial_cmp(&v2), Some(Ordering::Less));
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assert_eq!(v3a.partial_cmp(&v2), Some(Ordering::Greater));
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assert_eq!(v1.partial_cmp(&v1), Some(Ordering::Equal)); // only uses Interned::eq, not S::cmp
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assert_eq!(v3a.partial_cmp(&v3b), Some(Ordering::Equal)); // only uses Interned::eq, not S::cmp
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}
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