error: expected one of `(`, `const`, `default`, `extern`, `fn`, `type`, or `unsafe`, found `}`
  --> $DIR/issue-41155.rs:13:1
   |
12 |     pub
   |        - expected one of 7 possible tokens here
13 | } //~ ERROR expected one of
   | ^ unexpected token

error[E0412]: cannot find type `S` in this scope
  --> $DIR/issue-41155.rs:11:6
   |
11 | impl S { //~ ERROR cannot find type
   |      ^ not found in this scope

error[E0601]: main function not found

error: aborting due to 3 previous errors

You've got a few errors: E0412, E0601
If you want more information on an error, try using "rustc --explain E0412"