Specs

var(var, context) :: {var, [], context} when var: atom(), context: atom()

Generates an AST node representing the variable given by the atoms var and context.

Note this variable is not unique. If you later on want to access this same variable, you can invoke var/2 again with the same arguments. Use unique_var/2 to generate a unique variable that can't be overridden.

Examples

In order to build a variable, a context is expected. Most of the times, in order to preserve hygiene, the context must be __MODULE__/0:

iex> Macro.var(:foo, __MODULE__)
{:foo, [], __MODULE__}

However, if there is a need to access the user variable, nil can be given:

iex> Macro.var(:foo, nil)
{:foo, [], nil}