error[E0616]: field `len` of struct `sub::S` is private
  --> $DIR/issue-26472.rs:11:13
   |
LL |     let v = s.len;
   |             ^^---
   |               |
   |               help: a method `len` also exists, call it with parentheses: `len()`

error[E0616]: field `len` of struct `sub::S` is private
  --> $DIR/issue-26472.rs:12:5
   |
LL |     s.len = v;
   |     ^^^^^

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0616`.