How to translate this struct to Adept?

[ghost]

typedef struct _user_data
{
   struct _user_data *next;
   void              *data;
   char              *varname;
} UserData;

[IsaacShelton]

typedef struct _user_data
{
   struct _user_data *next;
   void              *data;
   char              *varname;
} UserData;

would be translated into

struct UserData (next *UserData, data ptr, varname *ubyte)

and if you also want the ability to refer to it as _user_data, then you can optionally create a type alias.

alias _user_data = UserData