failed to create temporary v8 archive download file in {}: {

Error message

failed to create temporary v8 archive download file in {}: {err}

What it means

Error "failed to create temporary v8 archive download file in {}: {err}" thrown in wasmerio/wasmer.

Source

Thrown at lib/api/build.rs:79

        if !archive_path.exists() {
            use std::io::Write;

            let url = format!(
                "https://github.com/wasmerio/wee8-custom-builds/releases/download/{WEE8_RELEASE_VERSION}/{asset_name}"
            );
            let tar_data = ureq::get(&url)
                .call()
                .expect("failed to download v8")
                .body_mut()
                .with_config()
                // Windows prebuilts are substantially larger.
                .limit(200 * 1024 * 1024)
                .read_to_vec()
                .expect("failed to download v8 lib");

            let mut archive_tmp =
                tempfile::NamedTempFile::new_in(&cache_dir).unwrap_or_else(|err| {
                    panic!(
                        "failed to create temporary v8 archive download file in {}: {err}",
                        cache_dir.display()
                    )
                });
            archive_tmp.write_all(&tar_data).unwrap_or_else(|err| {
                panic!(
                    "failed to write temporary v8 archive download file {}: {err}",
                    archive_tmp.path().display()
                )
            });
            archive_tmp.persist(&archive_path).unwrap_or_else(|err| {
                panic!(
                    "failed to finalize v8 archive cache {} from temporary file {}: {}",
                    archive_path.display(),
                    err.file.path().display(),
                    err.error
                )
            });

View on GitHub (pinned to 8c4b9ee9d3)

When it happens

Trigger: Thrown at lib/api/build.rs:79 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of wasmerio/wasmer@8c4b9ee9d3 (2026-09-01). Data as JSON: /api/errors/b2782f38cdde3359. Report an issue: GitHub.