13 lines
265 B
Plaintext
13 lines
265 B
Plaintext
pub fn alt(left: Option<a>, right: Option<a>) -> Option<a> {
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when (left, right) is {
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(Some(a), Some(_)) -> Some(a)
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(None, Some(a)) -> Some(a)
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(Some(a), None) -> Some(a)
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(None, None) -> None
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}
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}
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test foo() {
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Some(1) == alt(Some(1), Some(2))
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}
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