make_table changes input list

[joebo]

Something in this statement csv first:(csv behead) as 'tbl; causes csv to be changed

35. [["name"],["joe"],["bob"],["fred"]] as 'csv;                           
(0.0000 sec)                                                               
inputs@35: [["name"],["joe"],["bob"],["fred"]] as 'csv;                    
null                                                                       

36. csv first:(csv behead) as 'tbl;                                        
(0.0000 sec)                                                               
inputs@36: csv first:(csv behead) as 'tbl;                                 
null                                                                       

37. csv                                                                    
(0.0000 sec)                                                               
inputs@37: csv                                                             
outputs@37:                                                                
[["name"], ["joe"], ["bob"], ["fred"]]                                     

38. tbl                                                                    
(0.0000 sec)                                                               
inputs@38: tbl                                                             
outputs@38:                                                                
["name":[["joe"], ["bob"], ["fred"]]]                                      

39. csv first:(csv behead) as 'tbl;                                        
(0.0000 sec)                                                               
inputs@39: csv first:(csv behead) as 'tbl;                                 
null                                                                       

40. csv first:(csv behead) as 'tbl;                                        
(0.0000 sec)                                                               
inputs@40: csv first:(csv behead) as 'tbl;                                 
null                                                                       

41. csv first:(csv behead) as 'tbl;                                        
rlwrap: warning: xxl killed by SIGSEGV (core dumped).                      
rlwrap has not crashed, but for transparency,                              
it will now kill itself with the same signal                               

Segmentation fault                                                         



0. [["name"],["joe"],["bob"],["fred"]] as 'csv;                  
(0.0000 sec)                                                     
inputs@0: [["name"],["joe"],["bob"],["fred"]] as 'csv;           
null                                                             

1. csv first:(csv behead) as 'tbl;                               
(0.0000 sec)                                                     
inputs@1: csv first:(csv behead) as 'tbl;                        
null                                                             

2. csv first:(csv behead) as 'tbl;                               
(0.0000 sec)                                                     
inputs@2: csv first:(csv behead) as 'tbl;                        
null                                                             

3. csv                                                           
(0.0150 sec)                                                     
inputs@3: csv                                                    
outputs@3:                                                       
[["name"], ["joe"], ["bob"], ["fred"]]                           

4. csv first:(csv behead) as 'tbl;                               
(0.0000 sec)                                                     
inputs@4: csv first:(csv behead) as 'tbl;                        
null                                                             

5. csv                                                           
(0.0000 sec)                                                     
inputs@5: csv                                                    
outputs@5:                                                       
[["name"], ["joe"], ["bob"], ["fred"]]                           

6. csv first:(csv behead) as 'tbl;                               
(0.0000 sec)                                                     
inputs@6: csv first:(csv behead) as 'tbl;                        
null                                                             

7. csv                                                           
(0.0000 sec)                                                     
inputs@7: csv                                                    
outputs@7:                                                       
["name":[["name"], ["bob"], ["fred"]]]                           

csv should not have been modified in inputs@7