keep enum localparam types for later resolution

src/Convert/Typedef.hs

@@ -76,7 +76,10 @@ traverseDeclM decl = do
             insertElem x UnknownType >> return decl'
         ParamType Localparam x t -> do
             traverseTypeM t >>= scopeType >>= insertElem x
-            return $ CommentDecl $ "removed localparam type " ++ x
+            return $ case t of
+                Enum{} -> ParamType Localparam tmpX t
+                _ -> CommentDecl $ "removed localparam type " ++ x
+            where tmpX = "_sv2v_keep_enum_for_params"
         ParamType{} -> return decl'
         CommentDecl{} -> return decl'
 

test/basic/enum_typedef_keep.sv

+module top;
+    localparam int W = 4;
+    typedef logic [W - 1:0] T;
+    typedef enum T {
+        A = 4'b1010,
+        B = 4'b0101
+    } E;
+    initial $display("%d %d %b %b", $bits(A), $bits(B), A, B);
+endmodule

test/basic/enum_typedef_keep.v

+module top;
+    localparam W = 4;
+    localparam A = 4'b1010;
+    localparam B = 4'b0101;
+    initial $display("%d %d %b %b", W, W, A, B);
+endmodule