Wanted to see what peoples thoughts are about adding comments to the AST.  

One use-case is to be able to parse and manipulate Source files outside of just 
macros but in that case you would want to be able to preserve comments.  

E.g. Read a source file, manipulate it, write that source file back to a file.  

This would allow people/tooling to use elixir to parse and manipulate source 
files.

If this might disturb existing consumers of the AST maybe this could be added 
as a option to existing Macro functions so that I could be turned on for people 
with this use-case. 

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