Add comment to incomplete types

Author: kornilova203

bindgen/ir/TypeDef.cpp

@@ -13,7 +13,7 @@ llvm::raw_ostream &operator<<(llvm::raw_ostream &s, const TypeDef &typeDef) {
     if (typeDef.type) {
         s << typeDef.getType()->str();
     } else {
-        s << "native.CStruct0";
+        s << "native.CStruct0 // incomplete type";
     }
     s << "\n";
     return s;

tests/samples/OpaqueTypes.scala

@@ -6,17 +6,17 @@ import scala.scalanative.native._
 @native.link("bindgentests")
 @native.extern
 object OpaqueTypes {
-  type struct_undefinedIncludedStruct = native.CStruct0
+  type struct_undefinedIncludedStruct = native.CStruct0 // incomplete type
   type undefinedIncludedStruct = struct_undefinedIncludedStruct
   type struct_points = native.CStruct2[native.Ptr[struct_point], native.Ptr[struct_point]]
   type points = struct_points
   type struct_point = native.CStruct2[native.CInt, native.CInt]
   type union_u = native.CArray[Byte, native.Nat._4]
   type u = union_u
-  type struct_undefinedStruct = native.CStruct0
+  type struct_undefinedStruct = native.CStruct0 // incomplete type
   type struct_structWithPointerToUndefinedStruct = native.CStruct1[native.Ptr[struct_undefinedStruct]]
   type union_unionWithPointerToUndefinedStruct = native.CArray[Byte, native.Nat._8]
-  type union_undefinedUnion = native.CStruct0
+  type union_undefinedUnion = native.CStruct0 // incomplete type
   type undefinedUnion = union_undefinedUnion
   type aliasToPointerOfUndefinedUnion = native.Ptr[undefinedUnion]
   type aliasForUndefinedStruct = struct_undefinedStruct