Cure: A Dependently-Typed Programming Language for the BEAM Virtual Machine
By
delitrem
Hard crust, hollow middle. Skim only.
Summary
The article introduces Cure, a new strongly-typed, dependently-typed programming language designed for the BEAM virtual machine (Erlang/Elixir ecosystem). It showcases key features including dependent types for compile-time safety guarantees, native finite state machine (FSM) syntax with verified transitions, refinement types for value constraints, and exhaustive pattern matching. The language aims to bring formal verification and type safety to the BEAM environment traditionally known for dynamic typing.
Key quotes
· 4 pulleddef safe_head(v: Vector(T, n)): T when n > 0 = head(v)
fsm TrafficLight do Red --> |timer| Green Green --> |timer| Yellow Yellow --> |timer| Red Green --> |emergency| Red end
def safe_divide(a: Int, b: {x: Int | x != 0}): Int = a / b
Cure: A strongly-typed, dependently-typed programming language for the BEAM with built-in FSMs and SMT verification
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