Getting fields of an object type at compile time?

[pmags]

Still on my journey to understand macros and the Nim AST...

Is there an easy way to get the fields of an object type at **compile time** in 
a macro? Or do I need to write another macro to walk the AST myself?

For example, given:
    
    
    type Foo = object
      a: int
      b: string
    
    
    Run

Can I get something like:
    
    
    getFields(Foo)
    ("a", int), ("b", string)
    
    
    Run