error[E0308]: mismatched types
  --> $DIR/issue-33884.rs:6:22
   |
LL |     stream.write_fmt(format!("message received"))
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected struct `Arguments`, found struct `String`
   |
   = note: this error originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

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