Created
March 19, 2021 07:52
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How to temporarily hide a type
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| type _ foo = F1: int foo | F2: boo foo | |
| type 'b any = Any: 'a foo * ('a,'b) eq -> 'b any | |
| let split x = Any(x,Refl) | |
| let g (type tmp) (): int = | |
| let Any (type t) (foo,secret: t foo * (t,_) eq ) = split F1 in | |
| let tmp: t = match foo with F1 -> 0 | F2 -> true in | |
| match secret with Refl -> tmp |
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