error[E0308]: mismatched types
  --> $DIR/non-whitespace-trimming-unicode.rs:4:415
   |
LL | ...♯♰♱♲♳♴♵♶♷♸♹♺♻♼♽♾♿⚀⚁⚂⚃⚄⚅⚆⚈⚉4"; let _: () = 42;  let _: &str = "🦀☀☁☂☃☄★☆☇☈☉☊☋☌☍☎☏☐☑☒☓  ☖☗☘☙☚☛☜☝☞☟☠☡☢☣☤☥☦☧☨☩☪☫☬☭☮☯☰☱☲☳☴☵☶☷☸☹☺☻☼☽☾☿♀♁♂♃♄♅♆...
   |                                               ^^ expected (), found integer
   |
   = note: expected type `()`
              found type `{integer}`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.