1 files changed, 13 insertions, 0 deletions
diff --git a/src/io/fwd.hpp b/src/io/fwd.hpp
index deeb08c..3b9452b 100644
--- a/src/io/fwd.hpp
+++ b/src/io/fwd.hpp
@@ -20,6 +20,12 @@
 
 #include "../sanity.hpp"
 
+#include "../ints/fwd.hpp" // rank 1
+#include "../strings/fwd.hpp" // rank 1
+#include "../compat/fwd.hpp" // rank 2
+#include "../generic/fwd.hpp" // rank 3
+// io/fwd.hpp is rank 4
+
 
 namespace tmwa
 {
@@ -28,5 +34,12 @@ namespace io
     class ReadFile;
     class WriteFile;
     class AppendFile;
+    class LineReader;
+    class LineCharReader;
+    class Line;
+    class LineChar;
+    class LineSpan;
+    template<class T>
+    class Spanned;
 } // namespace io
 } // namespace tmwa