macro(). Invoking this value during package
construction time will instantiate the macro, and cause the macro's implementation function to be
evaluated (in a separate context, different from the context in which the macro value was invoked),
in most cases causing targets to be added to the package's target set. For more information, see
Macros.
  
  
      macro
    
    
       
    
    
      
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A callable Starlark value representing a symbolic macro; in other words, the return value of