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4.12.4 Castable STA "The type of a core castable expression" s/core/Core/ DEv / rule 1 / premise 2 "dynEnv |- Value1 cast as AtomicType => Value2" This is malformed. A (Formal) Value is not a CastExpr. Instead, change "Value1" to "Expr", and throw away premise 1.
Fixed as suggested. - Jerome