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; What color is your function?
; Impure functions are functions that can call both pure and impure functions.
; Pure functions can only call pure functions.
; Impure function names end in an exclamation mark (!) by convention.
; The top-level context is impure but has special rules
; related to `import!`, `let!`, and other builtins.
; pure function
(let! f (\[x] x))
; impure function
(let! g! (\![x] (print! x)))
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