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|     10 begin |     10 begin | 
|     11  |     11  | 
|     12 text {* |     12 text {* | 
|     13   This is just an ad-hoc hack which will rarely give you what you want. |     13   This is just an ad-hoc hack which will rarely give you what you want. | 
|     14   For the moment, whenever you need executable sets, consider using |     14   For the moment, whenever you need executable sets, consider using | 
|     15   type @{text fset} from theory @{text Fset}. |     15   type @{text fset} from theory @{text Cset}. | 
|     16 *} |     16 *} | 
|     17  |     17  | 
|     18 declare mem_def [code del] |     18 declare mem_def [code del] | 
|     19 declare Collect_def [code del] |     19 declare Collect_def [code del] | 
|     20 declare insert_code [code del] |     20 declare insert_code [code del] |