the "type" of the curly-bracket structure

[JohnAD]

If I write a macro as such:
    
    
    macro `@@@`(x: typed): FancyType =
      # stuff goes here
    
    var a = @@@{"fromStruct": "blah", "sub": {"joe": 10}}
    
    
    Run

All is good.

Or if I do:
    
    
    macro `@@@`(x: Blork): FancyType =
      # stuff goes here
    
    let xyz = Blork()
    var a = @@@xyz
    
    
    Run

All is still good.

But if I do both, then one macro overwrites the other.

Okay, no problem. I'll make the first one have a specific type for that 
curly-bracket-thing to separate it from the other. I can't see to find the name 
for it though. Reverse engineering implies the type is determined on a 
case-by-case basis during compile-time. Makes sense. Looking at `json` example 
of %*. Yep, uses NimNode generically. Drat.

But, I'll ask anyway: is there a way to "declare" that one version of the macro 
is expecting the curly-bracket-thing.

Also..is there an official name for 
the...curly-bracket-looks-like-json-but-isn't-thing? Giving me a name will help 
with further communication. :)