为Kindle生成Rust编程书籍epub时编译trpl-ebook遇E0642错误

Hey there, I've run into this exact issue before—here's what's going on and how to fix it:

What's Causing the Error #

The error comes down to a Rust language syntax update that rolled out around the 1.25 nightly period. Older Rust versions let you use pattern matching directly in method parameter lists (like &f_name: &str in the rustc-serialize code), but this syntax was deprecated and eventually removed in newer nightlies.

Your installed rustc-serialize v0.3.19 is an outdated release that still uses this now-invalid syntax, which conflicts with your 1.25.0-nightly compiler.

Solutions to Try #

1. Downgrade Rust to a Compatible Version

The fastest fix is to switch to a Rust version that still supports the old syntax. A stable release like 1.24.0 (the last stable build before this syntax was removed) will work perfectly for your project:

# Install the compatible version
rustup install 1.24.0
# Set it as the default for your system (use `rustup override set 1.24.0` for just this project)
rustup default 1.24.0
# Re-run your build command
cargo run --release

2. Update the rustc-serialize Dependency

If you want to keep using a newer Rust version, try updating rustc-serialize to a later patch release that fixed this syntax issue:

• Open your project's Cargo.toml file
• Find the line for rustc-serialize and modify it to:

  rustc-serialize = "0.3.24"
  

• Run cargo update to pull in the updated dependency, then try compiling again.

Note: Depending on how tightly trpl-ebook relies on the old rustc-serialize API, this might cause minor additional compilation issues—but it’s worth testing.

3. Pull the Latest trpl-ebook Code

It’s possible the project maintainers already fixed this dependency problem in recent GitHub commits. Try updating your local copy:

git pull origin master
cargo run --release

Why This Works #

Newer Rust versions enforce stricter syntax rules to improve language consistency, and old libraries like rustc-serialize v0.3.19 haven’t been updated to comply. Either downgrading Rust to match the library’s compatibility, or updating the library to fit Rust’s new rules, will resolve the compilation error.

内容的提问来源于stack exchange，提问作者Nabarun Pal