idris

Idris programming language and dependent types

Programming Idris Pattern Matching with Existential Types Explained

Understand how Idris' type checker handles pattern matching on existential types like EqNat. Learn why replacing Just (Same _) with Just _ causes type mismatch errors, even with single constructors, and how to refine dependent goals properly.

#idris
#pattern-matching
#dependent-types
#type-theory
#existential-types

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01/23/2026, 03:47 PM