error[E0599]: no method named write_all found for struct File in the current scope

[psumbera]

While building latest Rust it fails like this:

error[E0599]: no method named `write_all` found for struct `File` in the current scope
   --> src/bin/main.rs:134:21
    |
134 |             t!(file.write_all(lines.join("\n").as_bytes()));
    |                     ^^^^^^^^^ method not found in `File`
   --> /builds2/psumbera/rust-lang-build/library/std/src/io/mod.rs:1620:8
    |
    = note: the method is available for `File` here
    |
    = help: items from traits can only be used if the trait is in scope
help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
8   + use std::io::Write;
    |

For more information about this error, try `rustc --explain E0599`.
error: could not compile `bootstrap` (bin "bootstrap") due to previous error
warning: build failed, waiting for other jobs to finish...

419b269 is the first bad commit
commit 419b269
Author: David Tolnay [email protected]
Date: Wed Nov 29 23:02:05 2023 -0800

Add if_let_guard and let_chains pretty printer tests

tests/ui/macros/stringify.rs | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)

[psumbera]

@dtolnay do you have any idea about this? Thank you!

[dtolnay]

I am skeptical about that bisect. That commit is only adding tests. I do not see any way that it could cause bootstrap to fail to build.