diff --git a/ast.c b/ast.c
index 37643e9..402d7fa 100644
--- a/ast.c
+++ b/ast.c
@@ -39,6 +39,7 @@ struct Type {
 typedef enum Ast_Kind {
     AST_NONE,
     AST_ERROR,
+    AST_PROGRAM,
     AST_INT,
     AST_UNARY,
     AST_BINARY,
@@ -53,6 +54,9 @@ struct Ast {
     Ast_Kind kind;
     Token *pos;
 
+    Ast *first;
+    Ast *last;
+
     union {
         uint64_t u;
         struct {
diff --git a/parser.c b/parser.c
index 84ee6ea..952c24b 100644
--- a/parser.c
+++ b/parser.c
@@ -91,16 +91,20 @@ Ast *parse_expr(Parser *p, int power_of_binding_to_right) {
     return n;
 }
 
+Type *parse_declspec(Parser *p) {
+    if (match_token(p, TOK_int)) {
+        return type_int;
+    } else {
+        panicf("%s:%d: error: unknown token while parsing declspec", p->at->file, p->at->line);
+    }
+}
+
 Ast *parse_program(Parser *p) {
-    for (;;) {
-        if (match_keyword(p, keyword_int)) {
-            Token *ident = expect_token(p, TOK_IDENT);
-            expect_token(p, TOK_LPAREN);
-            expect_token(p, TOK_RPAREN);
-        } else {
-            Token *token = next_token(p);
-            panicf("invalid token");
-        }
+    Ast *result = create_ast(p->at, AST_PROGRAM);
+    while (p->at->kind != TOK_EOF) {
+        Type *type = parse_declspec(p);
+
+
     }
     return result;
 }