src/test/ui/suggestions/mut-borrow-needed-by-trait.stderr

   1 error[E0277]: the trait bound `&dyn std::io::Write: std::io::Write` is not satisfied
   2   --> $DIR/mut-borrow-needed-by-trait.rs:17:29
   3    |
   4 LL |     let fp = BufWriter::new(fp);
   5    |                             ^^ the trait `std::io::Write` is not implemented for `&dyn std::io::Write`
   6    |
   7    = note: `std::io::Write` is implemented for `&mut dyn std::io::Write`, but not for `&dyn std::io::Write`
   8 note: required by `BufWriter::<W>::new`
   9   --> $SRC_DIR/std/src/io/buffered/bufwriter.rs:LL:COL
  10    |
  11 LL |     pub fn new(inner: W) -> BufWriter<W> {
  12    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  13
  14 error[E0277]: the trait bound `&dyn std::io::Write: std::io::Write` is not satisfied
  15   --> $DIR/mut-borrow-needed-by-trait.rs:17:14
  16    |
  17 LL |     let fp = BufWriter::new(fp);
  18    |              ^^^^^^^^^^^^^^^^^^ the trait `std::io::Write` is not implemented for `&dyn std::io::Write`
  19    |
  20   ::: $SRC_DIR/std/src/io/buffered/bufwriter.rs:LL:COL
  21    |
  22 LL | pub struct BufWriter<W: Write> {
  23    |                         ----- required by this bound in `BufWriter`
  24    |
  25    = note: `std::io::Write` is implemented for `&mut dyn std::io::Write`, but not for `&dyn std::io::Write`
  26
  27 error[E0599]: the method `write_fmt` exists for struct `BufWriter<&dyn std::io::Write>`, but its trait bounds were not satisfied
  28   --> $DIR/mut-borrow-needed-by-trait.rs:21:5
  29    |
  30 LL |     writeln!(fp, "hello world").unwrap();
  31    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ method cannot be called on `BufWriter<&dyn std::io::Write>` due to unsatisfied trait bounds
  32    |
  33   ::: $SRC_DIR/std/src/io/buffered/bufwriter.rs:LL:COL
  34    |
  35 LL | pub struct BufWriter<W: Write> {
  36    | ------------------------------ doesn't satisfy `BufWriter<&dyn std::io::Write>: std::io::Write`
  37    |
  38    = note: the following trait bounds were not satisfied:
  39            `&dyn std::io::Write: std::io::Write`
  40            which is required by `BufWriter<&dyn std::io::Write>: std::io::Write`
  41    = note: this error originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
  42
  43 error: aborting due to 3 previous errors
  44
  45 Some errors have detailed explanations: E0277, E0599.
  46 For more information about an error, try `rustc --explain E0277`.