Compiling playground v0.0.1 (/playground)
error[E0599]: cannot write into `String`
   --> src/main.rs:3:16
    |
3   |     _ = write!(buf, "foo");
    |                ^^^
    |
   ::: /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:218:8
    |
218 |     fn write_fmt(&mut self, args: Arguments<'_>) -> Result {
    |        --------- the method is available for `String` here
    |
note: must implement `io::Write`, `fmt::Write`, or have a `write_fmt` method
   --> src/main.rs:3:16
    |
3   |     _ = write!(buf, "foo");
    |                ^^^
    = help: items from traits can only be used if the trait is in scope
help: trait `Write` which provides `write_fmt` is implemented but not in scope; perhaps you want to import it
    |
1   + use std::fmt::Write;
    |
help: there is a method `write_str` with a similar name
   --> /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/macros/mod.rs:713:14
    |
713 -         $dst.write_fmt($crate::format_args!($($arg)*))
713 +         $dst.write_str($crate::format_args!($($arg)*))
    |

For more information about this error, try `rustc --explain E0599`.
error: could not compile `playground` (bin "playground") due to 1 previous error

Compiling playground v0.0.1 (/playground)
error[E0599]: cannot write into `String`
   --> src/main.rs:3:16
    |
3   |     _ = write!(buf, "foo");
    |                ^^^
    |
   ::: /playground/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:218:8
    |
218 |     fn write_fmt(&mut self, args: Arguments<'_>) -> Result {
    |        --------- the method is available for `String` here
    |
note: must implement `io::Write`, `fmt::Write`, or have a `write_fmt` method
   --> src/main.rs:3:16
    |
3   |     _ = write!(buf, "foo");
    |                ^^^
    = help: items from traits can only be used if the trait is in scope
help: trait `Write` which provides `write_fmt` is implemented but not in scope; perhaps you want to import it
    |
1   + use std::fmt::Write;
    |

For more information about this error, try `rustc --explain E0599`.
error: could not compile `playground` (bin "playground") due to 1 previous error

rustc 1.88.0-nightly (092a284ba 2025-04-13)
binary: rustc
commit-hash: 092a284ba0421695f2032c947765429fd7095796
commit-date: 2025-04-13
host: x86_64-unknown-linux-gnu
release: 1.88.0-nightly
LLVM version: 20.1.2