New syntax that's easier to parse, parsing doesn't need variable lookup

expr.c

@@ -53,15 +53,29 @@ expr_index(Parser *p, Token *token, Expr *atom, Expr *index){
   return expr;
 }
 
-/*  
 function Expr *
-expr_cast(Parser *p, Token *token, AST_Node *type, Expr *exp){
+expr_cast(Parser *p, Token *token, Typespec *type, Expr *exp){
   Expr *expr = expr_new(p, EK_Cast, token);
   expr->cast.type = type;
   expr->cast.expr = exp;
   return expr;
 }
- */
+
+function Expr *
+expr_sizeof_type(Parser *p, Token *token, Typespec *type){
+  Expr *expr = expr_new(p, EK_Sizeof, token);
+  expr->size_of.kind = SIZEOF_Type;
+  expr->size_of.type = type;
+  return expr;
+}
+
+function Expr *
+expr_sizeof_expr(Parser *p, Token *token, Expr *in_expr){
+  Expr *expr = expr_new(p, EK_Sizeof, token);
+  expr->size_of.kind = SIZEOF_Expr;
+  expr->size_of.expr = in_expr;
+  return expr;
+}
 
 function Expr *
 expr_list(Parser *p, Token *token){