Module builtins 

Built-in functions over already-evaluated values.

show is NOT here — output is an engine concern. Arity is checked by the caller BEFORE evaluating arguments (via check_arity) to preserve the tree-walker’s error ordering: a wrong-arity call reports the arity error even when an argument expression would itself error.

Enums

BuiltinId

Functions

builtin_from_name

Resolve a function name to a builtin, if it is one.

call_builtin

check_arity

Check the call’s arity BEFORE evaluating arguments. format accepts any arity (it reads only its first argument, or none).