Add init statement to if

new_ast.cpp

@@ -89,6 +89,7 @@ enum Ast_Kind{
   AST_COMPOUND_ITEM,
   AST_COMPOUND,
 
+  AST_INIT,
   AST_IF,
   AST_IF_NODE,
   AST_RETURN,
@@ -167,9 +168,16 @@ struct Ast_Return: Ast{
   Ast_Expr *expr;
 };
 
+struct Ast_Init: Ast{
+  Token_Kind op;
+  Ast_Atom *ident;
+  Ast_Expr *expr;
+};
+
 struct Ast_If_Node: Ast{
   Ast_Expr  *expr ;
   Ast_Block *block;
+  Ast_Init  *init;
 };
 
 struct Ast_If: Ast{
@@ -338,9 +346,19 @@ ast_if(Token *pos, Array<Ast_If_Node *> ifs){
 }
 
 function Ast_If_Node *
-ast_if_node(Token *pos, Ast_Expr *expr, Ast_Block *block){
+ast_if_node(Token *pos, Ast_Init *init, Ast_Expr *expr, Ast_Block *block){
   AST_NEW(If_Node, AST_IF_NODE, pos);
-  result->block = block;
+  result->block    = block;
+  result->expr     = expr;
+  result->init = init;
+  return result;
+}
+
+function Ast_Init *
+ast_init(Token *pos, Token_Kind op, Ast_Atom *ident, Ast_Expr *expr){
+  AST_NEW(Init, AST_INIT, pos);
+  result->op    = op;
+  result->ident = ident;
   result->expr  = expr;
   return result;
 }