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19 lines
284 B
Idris
19 lines
284 B
Idris
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module Postfix
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record Diag (a : Type) where
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fstt : a
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sndd : a
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equal : fstt === sndd
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val : Diag a -> a
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val diag = diag .fstt
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prf : (d : Diag a) -> val d === d.sndd
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prf = ?a
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(.val') : Diag a -> a
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diag .val' = diag .sndd
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sym : (d : Diag a) -> d .fstt === d .val'
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sym = ?b
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