A stored function checked and compiled once (spec/02 §6.3, visualize D-194): hash, the
SHA-256 of its source; fun, the closure; arity; and warnings, the compiler's,
each {line, message}, printed nowhere.
Summary
Types
@type t() :: %Macaw.Data.Derived.Sandbox.Compiled{ arity: non_neg_integer(), fun: function(), hash: String.t(), warnings: [{pos_integer() | nil, String.t()}] }