156 struct WideRecursiveStruct {  struct
157     a: Option<Box<WideRecursiveStruct>>,  argument
158     b: Option<Box<WideRecursiveStruct>>,  argument
159     c: Option<Box<WideRecursiveStruct>>,  argument
160     d: Option<Box<WideRecursiveStruct>>,  argument
161     e: Option<Box<WideRecursiveStruct>>,  argument
162     f: Option<Box<WideRecursiveStruct>>,  argument
163     g: Option<Box<WideRecursiveStruct>>,  argument
164     h: Option<Box<WideRecursiveStruct>>,  argument
165     i: Option<Box<WideRecursiveStruct>>,  argument
166     k: Option<Box<WideRecursiveStruct>>,  argument