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fn main() {
// Below we call the closure with its own return as the argument, unifying
// its inferred input and return types. We want to make sure that the generated
// error handles this gracefully, and in particular doesn't generate an extra
// note about the `?` operator in the closure body, which isn't relevant to
// the inference.
let x = |r| {
//~^ ERROR type annotations needed
let v = r?;
Ok(v)
};
let _ = x(x(Ok(())));
}
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