anchor.diff:  %% =====================================================================
   %% @doc Returns the list of field subtrees of a `map_expr' node.
   %%
  -%% @see map_expr/3
  +%% @see map_expr/2
   
   -spec map_expr_fields(syntaxTree()) -> [syntaxTree()].
   
  
positive.code: %% Otherwise, if `Node' represents "<code><em>Argument</em>#{...}</code>",
  %% `Argument' is returned.
  %%
  %% @see map_expr/3
  
  -spec map_expr_argument(syntaxTree()) -> 'none' | syntaxTree().
  
  
negative.code: %%
  %% @see map_field_assoc_name/1
  %% @see map_field_assoc_value/1
  %% @see map_expr/2
  
  -record(map_field_assoc, {name :: syntaxTree(), value :: syntaxTree()}).
  
  