diff --git a/exercises/02/vslc/src/parser.y b/exercises/02/vslc/src/parser.y
index 0dde3de..3df5fde 100644
--- a/exercises/02/vslc/src/parser.y
+++ b/exercises/02/vslc/src/parser.y
@@ -1,5 +1,7 @@
 %{
 #include <vslc.h>
+
+#define NODE(type, data, n_children, children...) node_init(malloc(sizeof(node_t)), type, data, n_children,  ##children)
 %}
 
 %define api.value.type {node_t}
@@ -31,253 +33,253 @@
 
 program:
     global_list {
-      node_init(root = malloc(sizeof(node_t)), PROGRAM, NULL, 1, $1);
+      root = NODE(PROGRAM, NULL, 1, $1);
     }
-    ;
+  ;
 
 global_list:
     global {
-      node_init($$ = malloc(sizeof(node_t)), GLOBAL_LIST, NULL, 1, $1);
+      $$ = NODE(GLOBAL_LIST, NULL, 1, $1);
     }
   | global_list global {
-      node_init($$ = malloc(sizeof(node_t)), GLOBAL_LIST, NULL, 2, $1, $2);
+      $$ = NODE(GLOBAL_LIST, NULL, 2, $1, $2);
     }
   ;
 
 global:
     function {
-      node_init($$ = malloc(sizeof(node_t)), GLOBAL, NULL, 1, $1);
+      $$ = NODE(GLOBAL, NULL, 1, $1);
     }
   | declaration {
-      node_init($$ = malloc(sizeof(node_t)), GLOBAL, NULL, 1, $1);
+      $$ = NODE(GLOBAL, NULL, 1, $1);
     }
   ;
 
 statement_list:
     statement {
-      node_init($$ = malloc(sizeof(node_t)), STATEMENT_LIST, NULL, 1, $1);
+      $$ = NODE(STATEMENT_LIST, NULL, 1, $1);
     }
   | statement_list statement {
-      node_init($$ = malloc(sizeof(node_t)), STATEMENT_LIST, NULL, 2, $1, $2);
+      $$ = NODE(STATEMENT_LIST, NULL, 2, $1, $2);
     }
   ;
 
 print_list: 
     print_item {
-      node_init($$ = malloc(sizeof(node_t)), PRINT_LIST, NULL, 1, $1);
+      $$ = NODE(PRINT_LIST, NULL, 1, $1);
     }
   | print_list ',' print_item {
-      node_init($$ = malloc(sizeof(node_t)), PRINT_LIST, NULL, 2, $1, $3);
+      $$ = NODE(PRINT_LIST, NULL, 2, $1, $3);
     }
   ;
 
 expression_list:
     expression {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION_LIST, NULL, 1, $1);
+      $$ = NODE(EXPRESSION_LIST, NULL, 1, $1);
     }
   | expression_list ',' expression {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION_LIST, NULL, 2, $1, $3);
+      $$ = NODE(EXPRESSION_LIST, NULL, 2, $1, $3);
     }
   ;
 
 variable_list:
     identifier {
-      node_init($$ = malloc(sizeof(node_t)), VARIABLE_LIST, NULL, 1, $1);
+      $$ = NODE(VARIABLE_LIST, NULL, 1, $1);
     }
   | variable_list ',' identifier {
-      node_init($$ = malloc(sizeof(node_t)), VARIABLE_LIST, NULL, 2, $1, $3);
+      $$ = NODE(VARIABLE_LIST, NULL, 2, $1, $3);
     }
   ;
 
 argument_list:
     expression_list {
-      node_init($$ = malloc(sizeof(node_t)), ARGUMENT_LIST, NULL, 1, $1);
+      $$ = NODE(ARGUMENT_LIST, NULL, 1, $1);
     }
   | /* epsilon */ {
-      node_init($$ = malloc(sizeof(node_t)), ARGUMENT_LIST, NULL, 0);
+      $$ = NODE(ARGUMENT_LIST, NULL, 0);
     }
   ;
 
 parameter_list:
     variable_list {
-      node_init($$ = malloc(sizeof(node_t)), PARAMETER_LIST, NULL, 1, $1);
+      $$ = NODE(PARAMETER_LIST, NULL, 1, $1);
     }
   | /* epsilon */ {
-      node_init($$ = malloc(sizeof(node_t)), PARAMETER_LIST, NULL, 0);
+      $$ = NODE(PARAMETER_LIST, NULL, 0);
     }
   ;
 
 declaration_list:
     declaration {
-      node_init($$ = malloc(sizeof(node_t)), DECLARATION_LIST, NULL, 1, $1);
+      $$ = NODE(DECLARATION_LIST, NULL, 1, $1);
     }
   | declaration_list declaration {
-      node_init($$ = malloc(sizeof(node_t)), DECLARATION_LIST, NULL, 2, $1, $2);
+      $$ = NODE(DECLARATION_LIST, NULL, 2, $1, $2);
     }
   ;
 
 function:
     FUNC identifier '(' parameter_list ')' statement  {
-      node_init($$ = malloc(sizeof(node_t)), FUNCTION, NULL, 3, $2, $4, $6);
+      $$ = NODE(FUNCTION, NULL, 3, $2, $4, $6);
     }
   ;
 
 statement:
     assignment_statement {
-      node_init($$ = malloc(sizeof(node_t)), STATEMENT, NULL, 1, $1);
+      $$ = NODE(STATEMENT, NULL, 1, $1);
     }
   | return_statement {
-      node_init($$ = malloc(sizeof(node_t)), STATEMENT, NULL, 1, $1);
+      $$ = NODE(STATEMENT, NULL, 1, $1);
     }
   | print_statement {
-      node_init($$ = malloc(sizeof(node_t)), STATEMENT, NULL, 1, $1);
+      $$ = NODE(STATEMENT, NULL, 1, $1);
     }
   | if_statement {
-      node_init($$ = malloc(sizeof(node_t)), STATEMENT, NULL, 1, $1);
+      $$ = NODE(STATEMENT, NULL, 1, $1);
     }
   | while_statement {
-      node_init($$ = malloc(sizeof(node_t)), STATEMENT, NULL, 1, $1);
+      $$ = NODE(STATEMENT, NULL, 1, $1);
     }
   | null_statement {
-      node_init($$ = malloc(sizeof(node_t)), STATEMENT, NULL, 1, $1);
+      $$ = NODE(STATEMENT, NULL, 1, $1);
     }
   | block {
-      node_init($$ = malloc(sizeof(node_t)), STATEMENT, NULL, 1, $1);
+      $$ = NODE(STATEMENT, NULL, 1, $1);
     }
   ;
 
 block:
     OPENBLOCK declaration_list statement_list CLOSEBLOCK {
-      node_init($$ = malloc(sizeof(node_t)), BLOCK, NULL, 2, $2, $3);
+      $$ = NODE(BLOCK, NULL, 2, $2, $3);
     }
   | OPENBLOCK statement_list CLOSEBLOCK {
-      node_init($$ = malloc(sizeof(node_t)), BLOCK, NULL, 1, $2);
+      $$ = NODE(BLOCK, NULL, 1, $2);
     }
   ;
 
 assignment_statement:
     identifier ':' '=' expression {
-      node_init($$ = malloc(sizeof(node_t)), ASSIGNMENT_STATEMENT, NULL, 2, $1, $4);
+      $$ = NODE(ASSIGNMENT_STATEMENT, NULL, 2, $1, $4);
     }
   | identifier '+' '=' expression {
-      node_init($$ = malloc(sizeof(node_t)), ADD_STATEMENT, NULL, 2, $1, $4);
+      $$ = NODE(ADD_STATEMENT, NULL, 2, $1, $4);
     }
   | identifier '-' '=' expression {
-      node_init($$ = malloc(sizeof(node_t)), SUBTRACT_STATEMENT, NULL, 2, $1, $4);
+      $$ = NODE(SUBTRACT_STATEMENT, NULL, 2, $1, $4);
     }
   | identifier '*' '=' expression {
-      node_init($$ = malloc(sizeof(node_t)), MULTIPLY_STATEMENT, NULL, 2, $1, $4);
+      $$ = NODE(MULTIPLY_STATEMENT, NULL, 2, $1, $4);
     }
   | identifier '/' '=' expression {
-      node_init($$ = malloc(sizeof(node_t)), DIVIDE_STATEMENT, NULL, 2, $1, $4);
+      $$ = NODE(DIVIDE_STATEMENT, NULL, 2, $1, $4);
     }
   ;
 
 return_statement:
     RETURN expression {
-      node_init($$ = malloc(sizeof(node_t)), RETURN_STATEMENT, NULL, 1, $2);
+      $$ = NODE(RETURN_STATEMENT, NULL, 1, $2);
     }
   ;
 
 print_statement:
     PRINT print_list {
-      node_init($$ = malloc(sizeof(node_t)), PRINT_STATEMENT, NULL, 1, $2);
+      $$ = NODE(PRINT_STATEMENT, NULL, 1, $2);
     }
   ;
 
 null_statement:
     CONTINUE {
-      node_init($$ = malloc(sizeof(node_t)), NULL_STATEMENT, NULL, 0);
+      $$ = NODE(NULL_STATEMENT, NULL, 0);
     }
   ;
 
 if_statement:
     IF relation THEN statement {
-      node_init($$ = malloc(sizeof(node_t)), IF_STATEMENT, NULL, 2, $2, $4);
+      $$ = NODE(IF_STATEMENT, NULL, 2, $2, $4);
     }
   | IF relation THEN statement ELSE statement {
-      node_init($$ = malloc(sizeof(node_t)), IF_STATEMENT, NULL, 3, $2, $4, $6);
+      $$ = NODE(IF_STATEMENT, NULL, 3, $2, $4, $6);
     }
   ;
 
 while_statement:
     WHILE relation DO statement {
-      node_init($$ = malloc(sizeof(node_t)), WHILE_STATEMENT, NULL, 2, $2, $4);
+      $$ = NODE(WHILE_STATEMENT, NULL, 2, $2, $4);
     }
   ;
 
 relation:
     expression '=' expression {
-      node_init($$ = malloc(sizeof(node_t)), RELATION, strdup("="), 2, $1, $3);
+      $$ = NODE(RELATION, strdup("="), 2, $1, $3);
     }
   | expression '<' expression {
-      node_init($$ = malloc(sizeof(node_t)), RELATION, strdup("<"), 2, $1, $3);
+      $$ = NODE(RELATION, strdup("<"), 2, $1, $3);
     }
   | expression '>' expression {
-      node_init($$ = malloc(sizeof(node_t)), RELATION, strdup(">"), 2, $1, $3);
+      $$ = NODE(RELATION, strdup(">"), 2, $1, $3);
     }
   ;
 
 expression:
     expression '|' expression {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, strdup("|"), 2, $1, $3);
+      $$ = NODE(EXPRESSION, strdup("|"), 2, $1, $3);
     }
   | expression '^' expression {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, strdup("^"), 2, $1, $3);
+      $$ = NODE(EXPRESSION, strdup("^"), 2, $1, $3);
     }
   | expression '&' expression {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, strdup("&"), 2, $1, $3);
+      $$ = NODE(EXPRESSION, strdup("&"), 2, $1, $3);
     }
   | expression '+' expression {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, strdup("+"), 2, $1, $3);
+      $$ = NODE(EXPRESSION, strdup("+"), 2, $1, $3);
     }
   | expression '-' expression {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, strdup("-"), 2, $1, $3);
+      $$ = NODE(EXPRESSION, strdup("-"), 2, $1, $3);
     }
   | expression '*' expression {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, strdup("*"), 2, $1, $3);
+      $$ = NODE(EXPRESSION, strdup("*"), 2, $1, $3);
     }
   | expression '/' expression {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, strdup("/"), 2, $1, $3);
+      $$ = NODE(EXPRESSION, strdup("/"), 2, $1, $3);
     }
   | '-' expression %prec UMINUS {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, strdup("-"), 1, $2);
+      $$ = NODE(EXPRESSION, strdup("-"), 1, $2);
     }
   | '~' expression {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, strdup("~"), 1, $2);
+      $$ = NODE(EXPRESSION, strdup("~"), 1, $2);
     }
   | '(' expression ')' {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, /*NULL*/ strdup("group"), 1, $2);
+      $$ = NODE(EXPRESSION, /*NULL*/ strdup("group"), 1, $2);
     }
   | number {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, /*NULL*/ strdup("number"), 1, $1);
+      $$ = NODE(EXPRESSION, /*NULL*/ strdup("number"), 1, $1);
     }
   | identifier {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, /*NULL*/ strdup("identifier"), 1, $1);
+      $$ = NODE(EXPRESSION, /*NULL*/ strdup("identifier"), 1, $1);
     }
   | identifier '(' argument_list ')' {
-      node_init($$ = malloc(sizeof(node_t)), EXPRESSION, /*NULL*/ strdup("function_call"), 2, $1, $3);
+      $$ = NODE(EXPRESSION, /*NULL*/ strdup("function_call"), 2, $1, $3);
     }
   ;
 
 declaration: 
     VAR variable_list {
-      node_init($$ = malloc(sizeof(node_t)), DECLARATION, NULL, 1, $2);
+      $$ = NODE(DECLARATION, NULL, 1, $2);
     }
   ;
 
 print_item:
     expression {
-      node_init($$ = malloc(sizeof(node_t)), PRINT_ITEM, NULL, 1, $1);
+      $$ = NODE(PRINT_ITEM, NULL, 1, $1);
     }
   | string {
-      node_init($$ = malloc(sizeof(node_t)), PRINT_ITEM, NULL, 1, $1);
+      $$ = NODE(PRINT_ITEM, NULL, 1, $1);
     }
   ;
 
 identifier:
     IDENTIFIER {
-      node_init($$ = malloc(sizeof(node_t)), IDENTIFIER_DATA, strdup(yytext), 0); // Zero children
+      $$ = NODE(IDENTIFIER_DATA, strdup(yytext), 0); // Zero children
     }
   ;
 
@@ -285,13 +287,13 @@ number:
     NUMBER {
       uint64_t* p_number = malloc(sizeof(uint64_t));
       *p_number = strtol(yytext, NULL, 10);
-      node_init($$ = malloc(sizeof(node_t)), NUMBER_DATA, p_number, 0); // Zero children
+      $$ = NODE(NUMBER_DATA, p_number, 0); // Zero children
     }
   ;
 
 string:
     STRING {
-      node_init($$ = malloc(sizeof(node_t)), STRING_DATA, strdup(yytext), 0); // Zero children
+      $$ = NODE(STRING_DATA, strdup(yytext), 0); // Zero children
     }
   ;