RS.CLIPPY.PATH_ENDS_WITH_EXT

What it does

Looks for calls to Path::ends_with calls where the argument looks like a file extension.

By default, Clippy has a short list of known filenames that start with a dot but aren't necessarily file extensions (e.g. the .git folder), which are allowed by default. The allowed-dotfiles configuration can be used to allow additional file extensions that Clippy should not lint.

Why is this bad?

This doesn't actually compare file extensions. Rather, ends_with compares the given argument to the last component of the path and checks if it matches exactly.

Known issues

File extensions are often at most three characters long, so this only lints in those cases in an attempt to avoid false positives. Any extension names longer than that are assumed to likely be real path components and are therefore ignored.

Example

fn is_markdown(path: &Path) -> bool {
    path.ends_with(".md")
}

Use instead:

fn is_markdown(path: &Path) -> bool {
    path.extension().is_some_and(|ext| ext == "md")
}

Configuration

• allowed-dotfiles: Additional dotfiles (files or directories starting with a dot) to allow

  (default: [])