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 13.1 Annotations
 ================
 
 The optimizers need to associate attributes with variables during the
 optimization process.  For instance, we need to know whether a variable
 has aliases.  All these attributes are stored in data structures called
 annotations which are then linked to the field `ann' in `struct
 tree_common'.
 
  Presently, we define annotations for variables (`var_ann_t').
 Annotations are defined and documented in `tree-flow.h'.
 

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