This section lists the functions built into the Nix expression
evaluator. (The built-in function
derivation is discussed above.)
Some built-ins, such as
derivation, are always in scope of every Nix
expression; you can just access them right away. But to prevent
polluting the namespace too much, most built-ins are not in
scope. Instead, you can access them through the
value, which is a set that contains all built-in functions and values.
derivation is also available as
derivation in described in its own section.