How to interpret a function attribute in FunctionClauseError

 %FunctionClauseError{
   module: MyApp.MyModule,
   function: :"-load_data/4-inlined-0-",
   arity: 1,
   kind: nil,
   args: nil,
   clauses: nil
}

The term -load_data/4-inlined-0- point to something inside load_data/4 function.
How to interpret this part: inlined-0?
I assume it points to first macro call in the load_data/4 function body.
This part of the evironment seem to be undocumented. Can anyone elaborate on this subject?