Phase 0: Expanding Macros...                                           
Expanded AST:
[                                                                        
"let",
  [                                                                         [
      "buffer",                                                              
[                                                                        
"str",                                                                  "JSON:
{ \"ok\": 1 }"                                                 ]              
                                                      ],                      
                                               [                              
                                          "bit_mask",                         
                                   255                                        
                          ]                                                   
                 ],                                                           
          [                                                                   
     "record",                                                              
"type",                                                                 [     
                                                                   "typeof",  
                                                            "buffer"          
                                                   ],                         
                                            "length",                         
                                     [                                        
                                "len",                                        
                         "buffer"                                             
                ],                                                            
         "signature",                                                         
  [                                                                        
"slice",                                                               
"buffer",                                                               0,    
                                                                 4            
            
                                            ],                                
                                     "first_char",                            
                              [                                               
                         "get",                                               
                  "buffer",                                                   
           0
    ],                                                                     
"concatenated",
    [                                                                        
"+",
      [                                                                       
 "str",
        "MASKED_"                                                            
],
      [                                                                       
 "&",
        1024,                                                                 
 "bit_mask"
      ]                                                                     ]
  ]                                                                     ]
Phase 1: Analyzing AST statically...                                    Phase
2: Compiling to Bytecode...
Dispatching execution to Worker thread...                               
Execution ended. Status Code: 2                                         Final
Output: {
  "type": "completed",                                                   
"data": {
    "concatenated": "MASKED_0",                                            
"first_char": "J",                                                     
"signature": "JSON",                                                   
"length": 17,
    "type": "string"                                                      }
}