E0072 needs to be updated to new format

[sophiajt]

From: src/test/compile-fail/E0072.rs

Error E0072 needs a span_label, updating it from:

error[E0072]: recursive type `ListNode` has infinite size
  --> src/test/compile-fail/E0072.rs:11:1
   |
11 | struct ListNode { //~ ERROR E0072
   | ^
   |
   = help: insert indirection (e.g., a `Box`, `Rc`, or `&`) at some point to make `ListNode` representable

error: aborting due to previous error

To:

error[E0072]: recursive type `ListNode` has infinite size
  --> src/test/compile-fail/E0072.rs:11:1
   |
11 | struct ListNode { //~ ERROR E0072
   | ^ recursive type has infinite size
   |
   = help: insert indirection (e.g., a `Box`, `Rc`, or `&`) at some point to make `ListNode` representable

error: aborting due to previous error

Bonus: put the span on the name of the struct:

error[E0072]: recursive type `ListNode` has infinite size
  --> src/test/compile-fail/E0072.rs:11:1
   |
11 | struct ListNode { //~ ERROR E0072
   |        ^^^^^^^^ recursive type has infinite size
   |
   = help: insert indirection (e.g., a `Box`, `Rc`, or `&`) at some point to make `ListNode` representable

error: aborting due to previous error

[creativcoder]

I'd like to work on this.

[sophiajt]

@creativcoder - Looks like @circuitfox has already taken this one. There are some other free ones on the list if you're interested.