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": {                                                                 "0":
"MASKED_",                                                         "1024":
255,                                                           
"concatenated": "MASKED_",                                             
"first_char": "J"                                                     }       
                                                             }