anchor.diff:  
   
   %% =====================================================================
  -%% @spec is_proper_list(Node::syntaxTree()) -> boolean()
  -%%
   %% @doc Returns <code>true</code> if <code>Node</code> represents a
   %% proper list, and <code>false</code> otherwise. A proper list is a
   %% list skeleton either on the form "<code>[]</code>" or
  
positive.code: 
  
  %% =====================================================================
  %% @spec catch_expr(Expr::syntaxTree()) -> syntaxTree()
  %%
  %% @doc Creates an abstract catch-expression. The result represents
  %% "<code>catch <em>Expr</em></code>".
  %%
  
negative.code: 
  
  %% =====================================================================
  %% @doc Return the list of body subtrees of a <code>clause</code>
  %% node.
  %%
  