fix #10698: infer primitive return type in generic position #11313
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Fix #10698 This fix only applies to primitive return type, so it guarantees no implicit any will escape the warning. It's just a mitigation for cyclic type inference, but I think it is good enough for common usage.
Some cyclic cases like
let f = () => fare not fixed, because it will need to generate more anonymous type for later merging. I don't know whether this is good.@yuit @mhegazy How do you feel about this approach?