zed-industries/zed · error

Failed to create USERNAME_REGEX

Error message

Failed to create USERNAME_REGEX

What it means

A static-initialization guard: USERNAME_REGEX is a LazyLock holding a hardcoded regex ('^[^/@:]+@') for detecting the user@ prefix of SCP-like git remotes. Regex::new on this constant can only fail if the pattern string itself is malformed — a programming error committed in source — so the expect is an invariant on a compile-time constant, not a reaction to any runtime URL input.

Source

Thrown at crates/git/src/remote.rs:17

use std::str::FromStr;
use std::sync::LazyLock;

use derive_more::Deref;
use regex::Regex;
use url::Url;

/// The URL to a Git remote.
#[derive(Debug, PartialEq, Eq, Clone, Deref)]
pub struct RemoteUrl(Url);

// Detect the `user@` prefix of an SCP-like remote (e.g. `git@host:path`). The
// username may contain anything but the `@`/`:`/`/` that delimit the user,
// host, and path, so match by exclusion rather than an allowlist that misses
// names like `first.last`.
static USERNAME_REGEX: LazyLock<Regex> =
    LazyLock::new(|| Regex::new(r"^[^/@:]+@").expect("Failed to create USERNAME_REGEX"));

impl FromStr for RemoteUrl {
    type Err = url::ParseError;

    fn from_str(input: &str) -> Result<Self, Self::Err> {
        if USERNAME_REGEX.is_match(input) {
            // Rewrite remote URLs like `git@github.com:user/repo.git` to `ssh://git@github.com/user/repo.git`
            let ssh_url = format!("ssh://{}", input.replacen(':', "/", 1));
            Ok(RemoteUrl(Url::parse(&ssh_url)?))
        } else {
            Ok(RemoteUrl(Url::parse(input)?))
        }
    }
}

#[cfg(test)]
mod tests {
    use pretty_assertions::assert_eq;

View on GitHub (pinned to f4178619ac)

Solutions

1. Add a unit test that forces the LazyLock to initialize, turning a bad pattern into a CI failure
2. Keep expect but document next to it that the pattern is exercised by a test, so future edits update both
3. Compile the pattern once in a build-time check if a regex macro is available

When it happens

Trigger: Thrown at crates/git/src/remote.rs:17 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@f4178619ac (2026-08-20). Data as JSON: /api/errors/81704da8ceb65cb0. Report an issue: GitHub.