move ident_stack out of public interface

include/cubescript/cubescript.hh

@@ -401,13 +401,6 @@ private:
     value_type p_type;
 };
 
-struct ident_stack {
-    any_value val_s;
-    ident_stack *next;
-
-    ident_stack(state &cs): val_s{cs}, next{nullptr} {}
-};
-
 struct error;
 struct codegen_state;
 

src/cs_ident.hh

@@ -16,6 +16,12 @@ enum {
     ID_NOT, ID_AND, ID_OR
 };
 
+struct ident_stack {
+    any_value val_s;
+    ident_stack *next;
+    ident_stack(state &cs): val_s{cs}, next{nullptr} {}
+};
+
 struct ident_link {
     ident *id;
     ident_link *next;

src/cs_thread.hh

@@ -7,6 +7,7 @@
 
 #include "cs_std.hh"
 #include "cs_state.hh"
+#include "cs_ident.hh"
 
 namespace cubescript {