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Fix closure arg extraction in `extract_callable_info`, generalize it to async closures * Fix argument extraction in `extract_callable_info` * FIx `extract_callable_info` to work for async closures * Remove redundant `is_fn_ty` which is just a less general `extract_callable_info` * More precisely name what is being called (i.e. call it a "closure" not a "function") Review this without whitespace -- I ended up reformatting `extract_callable_info` because some pesky `//` comments were keeping the let-chains from being formatted.