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42 lines
1.0 KiB
Rust
42 lines
1.0 KiB
Rust
// run-pass
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//
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// At one time, the `==` operator (and other binary operators) did not
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// support subtyping during type checking, and would therefore require
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// LHS and RHS to be exactly identical--i.e. to have the same lifetimes.
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//
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// This was fixed in 1a7fb7dc78439a704f024609ce3dc0beb1386552.
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#[derive(Copy, Clone)]
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struct Input<'a> {
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foo: &'a u32
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}
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impl <'a> std::cmp::PartialEq<Input<'a>> for Input<'a> {
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fn eq(&self, other: &Input<'a>) -> bool {
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self.foo == other.foo
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}
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fn ne(&self, other: &Input<'a>) -> bool {
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self.foo != other.foo
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}
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}
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fn check_equal<'a, 'b>(x: Input<'a>, y: Input<'b>) -> bool {
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// Type checking error due to 'a != 'b prior to 1a7fb7dc78
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x == y
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}
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fn main() {
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let i = 1u32;
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let j = 1u32;
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let k = 2u32;
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let input_i = Input { foo: &i };
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let input_j = Input { foo: &j };
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let input_k = Input { foo: &k };
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assert!(check_equal(input_i, input_i));
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assert!(check_equal(input_i, input_j));
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assert!(!check_equal(input_i, input_k));
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}
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