Return values for set_func_start() 
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#define  | MOVE_FUNC_OK   0 | 
|   | ok 
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#define  | MOVE_FUNC_NOCODE   1 | 
|   | no instruction at 'newstart' 
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#define  | MOVE_FUNC_BADSTART   2 | 
|   | bad new start address 
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#define  | MOVE_FUNC_NOFUNC   3 | 
|   | no function at 'ea' 
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#define  | MOVE_FUNC_REFUSED   4 | 
|   | a plugin refused the action 
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