Better function return type inference #3571
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If the function prototype is a type variable, its upper bound might contain useful information for inferring the return type of the function. Before this PR, the added testcases failed because `() => 4` was typed as `() => Int` and `() => new Inv` as `() => Inv[Nothing]`, even though the expected types of the functions give enough information to correctly infer them.
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If the function prototype is a type variable, its upper bound might
contain useful information for inferring the return type of the
function. Before this PR, the added testcases failed because
() => 4was typed as
() => Intand() => new Invas() => Inv[Nothing],even though the expected types of the functions give enough information
to correctly infer them.