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
  10 error[E0277]: the trait bound `&dyn std::io::Write: std::io::Write` is not satisfied
  11   --> $DIR/mut-borrow-needed-by-trait.rs:17:14
  12    |
  13 LL |     let fp = BufWriter::new(fp);
  14    |              ^^^^^^^^^^^^^^ the trait `std::io::Write` is not implemented for `&dyn std::io::Write`
  15    |
  16   ::: $SRC_DIR/std/src/io/buffered.rs:LL:COL
  17    |
  18 LL | pub struct BufWriter<W: Write> {
  19    |                         ----- required by this bound in `BufWriter`
  20    |
  21    = note: `std::io::Write` is implemented for `&mut dyn std::io::Write`, but not for `&dyn std::io::Write`
  22
  23 error[E0277]: the trait bound `&dyn std::io::Write: std::io::Write` is not satisfied
  24   --> $DIR/mut-borrow-needed-by-trait.rs:17:14
  25    |
  26 LL |     let fp = BufWriter::new(fp);
  27    |              ^^^^^^^^^^^^^^^^^^ the trait `std::io::Write` is not implemented for `&dyn std::io::Write`
  28    |
  29   ::: $SRC_DIR/std/src/io/buffered.rs:LL:COL
  30    |
  31 LL | pub struct BufWriter<W: Write> {
  32    |                         ----- required by this bound in `BufWriter`
  33    |
  34    = note: `std::io::Write` is implemented for `&mut dyn std::io::Write`, but not for `&dyn std::io::Write`
  35
  36 error[E0599]: no method named `write_fmt` found for struct `BufWriter<&dyn std::io::Write>` in the current scope
  37   --> $DIR/mut-borrow-needed-by-trait.rs:22:5
  38    |
  39 LL |     writeln!(fp, "hello world").unwrap();
  40    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ method not found in `BufWriter<&dyn std::io::Write>`
  41    |
  42   ::: $SRC_DIR/std/src/io/buffered.rs:LL:COL
  43    |
  44 LL | pub struct BufWriter<W: Write> {
  45    | ------------------------------ doesn't satisfy `BufWriter<&dyn std::io::Write>: std::io::Write`
  46    |
  47    = note: the method `write_fmt` exists but the following trait bounds were not satisfied:
  48            `&dyn std::io::Write: std::io::Write`
  49            which is required by `BufWriter<&dyn std::io::Write>: std::io::Write`
  50    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
  51
  52 error: aborting due to 4 previous errors
  53
  54 Some errors have detailed explanations: E0277, E0599.
  55 For more information about an error, try `rustc --explain E0277`.