Infer lambda return types #7741
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jez
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Apr 25, 2024
Sometimes it's useful to be able to use the arity of the block to guess an overload. This isn't perfect for all the reasons that overload checking isn't perfect, but there are some places where this is useful, especially in abstractions that check the proc's arity when deciding how to call the block. This is also a pre-requisite for doing something like #7741, which is a partial fix for #3914 / #4149, where we infer the types of `Kernel#lambda` blocks by codegenerating overloaded signatures.
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Motivation
Partial fix for #3914
Partial fix for #4149
Test plan