The.

src/ast.c

@@ -10,7 +10,7 @@ static char* asttype_names[] = {
 };
 #endif
 
-ASTTypeNum* ast_type_num_init(AST* val) {
+ASTTypeNum* ast_type_num_init(int val) {
     talloc(ASTTypeNum, num);
 
     num->val = val;

src/grammar.y

@@ -24,7 +24,9 @@ void yyerror (char const *);
 
 exp: 
     NUM { $$ = ast_type_num_init($1); }
-   | NUM PLUS NUM { AST* argv[2] = {ast_type_num_init($1), ast_type_num_init($1)}; $$ = ast_type_call_init("+", 2, argv);}
-   ;
+    | NUM PLUS NUM {
+        AST* argv[2] = {ast_type_num_init($1), ast_type_num_init($1)};
+        $$ = ast_type_call_init("+", 2, argv);
+    };
 
 %%

src/include/ast.h

@@ -18,10 +18,10 @@ AST* ast_init(ASTType type, void* data);
 void ast_destroy(AST* ast);
 
 typedef struct {
-    AST* val;
+    int val;
 } ASTTypeNum;
 
-ASTTypeNum* ast_type_num_init(AST* val);
+ASTTypeNum* ast_type_num_init(int val);
 void ast_type_num_destroy(ASTTypeNum* num);
 
 typedef struct {