bugs_prod.cd 155 Bytes
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let x : `A | `B = `A;;
let y : `A | `B = `B;;
(* let z : (`A,`A)|(`B,`B) = (x,y);; *)
let a : { x = `A; y = `A } |  { x = `B; y = `B } = { x = x; y = y };;