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error[E0277]: the trait bound `&dyn std::io::Write: std::io::Write` is not satisfied
--> $DIR/mut-borrow-needed-by-trait.rs:17:29
|
LL | let fp = BufWriter::new(fp);
| -------------- ^^ the trait `std::io::Write` is not implemented for `&dyn std::io::Write`
| |
| required by a bound introduced by this call
|
= note: `std::io::Write` is implemented for `&mut dyn std::io::Write`, but not for `&dyn std::io::Write`
note: required by a bound in `BufWriter::<W>::new`
--> $SRC_DIR/std/src/io/buffered/bufwriter.rs:LL:COL
error[E0277]: the trait bound `&dyn std::io::Write: std::io::Write` is not satisfied
--> $DIR/mut-borrow-needed-by-trait.rs:17:14
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LL | let fp = BufWriter::new(fp);
| ^^^^^^^^^^^^^^^^^^ the trait `std::io::Write` is not implemented for `&dyn std::io::Write`
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= note: `std::io::Write` is implemented for `&mut dyn std::io::Write`, but not for `&dyn std::io::Write`
note: required by a bound in `BufWriter`
--> $SRC_DIR/std/src/io/buffered/bufwriter.rs:LL:COL
error[E0599]: the method `write_fmt` exists for struct `BufWriter<&dyn Write>`, but its trait bounds were not satisfied
--> $DIR/mut-borrow-needed-by-trait.rs:21:14
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LL | writeln!(fp, "hello world").unwrap();
| ---------^^---------------- method cannot be called on `BufWriter<&dyn Write>` due to unsatisfied trait bounds
--> $SRC_DIR/std/src/io/buffered/bufwriter.rs:LL:COL
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= note: doesn't satisfy `BufWriter<&dyn std::io::Write>: std::io::Write`
|
note: must implement `io::Write`, `fmt::Write`, or have a `write_fmt` method
--> $DIR/mut-borrow-needed-by-trait.rs:21:14
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LL | writeln!(fp, "hello world").unwrap();
| ^^
= note: the following trait bounds were not satisfied:
`&dyn std::io::Write: std::io::Write`
which is required by `BufWriter<&dyn std::io::Write>: std::io::Write`
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0277, E0599.
For more information about an error, try `rustc --explain E0277`.
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