9 lines
267 B
JavaScript
9 lines
267 B
JavaScript
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// @flow
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function foo(x: Array<number>): [number, ?number] {
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return x; // Error, can't enforce arity when flowing array to tuple
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}
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function foo(x: Array<number>): [number, ?number] {
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return [x[0], x[1]]; // OK. This is unsound, but at least arity is enforced
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}
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