A question about metaprogramming - am I missing something obvious?

Hey everybody,
A quick question where I feel I am missing something obvious. Suppose we have this:

iex> code1 = quote(do: to_string('abc'))
{:to_string, [context: Elixir, import: Kernel], ['abc']}

iex> code2 = Code.string_to_quoted!("to_string('abc')")
{:to_string, [line: 1], ['abc']}

iex> Code.eval_quoted(code1)
{"abc", []}
iex> Code.eval_quoted(code2)
{"abc", []}

My question is: are code1 and code2 considered identical in terms of AST?

1 Like

They have different ASTs code1 != code2 do they are not identical in terms of AST. The metadata is different. In your example it happend to produce the same result but it doesn’t have to be that way:

iex1> 0 ↵
 alias Alphabet, as: Abc
iex2> 0 ↵
 code1 = quote do: Abc
{:__aliases__, [alias: Alphabet], [:Abc]}
iex3> 0 ↵
 code2 = Code.string_to_quoted!("Abc")
{:__aliases__, [counter: 0, line: 1], [:Abc]}
iex4> 0 ↵
{Alphabet, []}
iex5> 0 ↵
{Abc, []}
iex6> 0 ↵