67     char *arena; // string/data storage for steps  member
135         char *a = ins->arena + ins->aused;  in mcp_inspector_string_i_g()
272     const char *str = ins->arena + c->str;  in mcp_inspector_keybegin_r()
289     const char *str = ins->arena + c->str;  in mcp_inspector_keyis_r()
425         char *a = ins->arena + ins->aused;  in mcp_inspector_flagstr_i()
437     const char *str = ins->arena + c->str;  in mcp_inspector_flagis_r()
556     ins->arena = malloc(size);  in mcp_inspector_new()
557     if (ins->arena == NULL) {  in mcp_inspector_new()
622     if (ins->arena) {  in mcplib_inspector_gc()
623         free(ins->arena);  in mcplib_inspector_gc()
624         ins->arena = NULL;  in mcplib_inspector_gc()