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Nested variable expansion
------------------------------
$$greeting = {{Hello $$Args[0]{}}}
$$writeLetter = {{Date = $$Args[0]{}, $$greeting{$$Args[1]{}}}}
$$writeLetter{Tuesday|Bob}
$$writeLetter = {{$$greeting{$$Args[1]{}}, Date = $$Args[0]{}}}
$$writeLetter{Wednesday|Charlie}
------------------------------


Date = Tuesday, Hello Bob

Hello Charlie, Date = Wednesday
------------------------------
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Stacking functions with slow evaluation
------------------------------
$$bigFunction = {{$$smallerFunction{}
This is the outer layer!}}
$$smallerFunction = {This is the inner layer!}
$$bigFunction{}
------------------------------


This is the inner layer!
This is the outer layer!
------------------------------
================================================================================
Stacking functions without slow evaluation
------------------------------
$$bigFunction = {$$smallerFunction{}
This is the outer layer!}
$$smallerFunction = {This is the inner layer!}
$$bigFunction{}
------------------------------

This is the outer layer!}


------------------------------
Unknown variable smallerFunction
Unknown variable bigFunction
================================================================================
Single braces
------------------------------
$$name = {Alex}
$$greeting = {Hello $$name{}}
$$greeting{}
$$name = {Chris}
$$greeting{}
------------------------------


Hello Alex

Hello Alex
------------------------------
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Double braces
------------------------------
$$name = {Alex}
$$greeting = {{Hello $$name{}}}
$$greeting{}
$$name = {Chris}
$$greeting{}
------------------------------


Hello Alex

Hello Chris
------------------------------
================================================================================