slint-ui/slint · error

Version " " must be specified for dependency

Error message

Version "{}" must be specified for dependency {}

What it means

For in-repo `slint*`/`i-slint*` dependencies that do have a `path`, the version string must exactly match the expected version of the current release line (checked against `expected_version` in check_dependencies). A mismatched version would publish crates claiming compatibility with a different slint release than the one in-tree.

Solutions

1. Update the dependency's `version` in Cargo.toml to the expected version reported in the error (e.g. `version = "=1.8.0"`).
2. Run the xtask release/version-bump command so all Cargo.toml files are updated consistently.
3. Diff against another crate's Cargo.toml that passed the check to copy the correct version string.

Example fix

// before
i-slint-core = { version = "=1.7.0", path = "../../internal/core" }
// after
i-slint-core = { version = "=1.8.0", path = "../../internal/core" }

const EXPECTED = '1.8.0';
const v = toml.parse(fs.readFileSync('Cargo.toml')).dependencies['i-slint-core'].version;
if (v !== `=${EXPECTED}`) throw new Error(`version ${v} != =${EXPECTED}`);

When it happens

Trigger: Bumping the slint version in one place but not in a crate's Cargo.toml dependency declaration; hand-editing the version string; merging a release branch where the version constant and Cargo.toml files drifted.

Common situations: Release preparation (`xtask release`) where one Cargo.toml was missed; cherry-picking a crate from an older branch; adding a dependency by copying the version from docs instead of the current release version.

Understand the failure class

Background: "Invalid value" and "allowed values are" config errors: what your library rejected and how to fix it — this error's family across 41 libraries.

Related errors

• slint package ' ' outside of the repository?
• failed: exited with
• cargo failed
• dev-dependencies cannot be from the workspace because…
• field is not a string

AI-assisted analysis of slint-ui/slint@3a7e700487 (2026-09-16). Data as JSON: /api/errors/778c8c52b869256a. Report an issue: GitHub.

Appendix: source

Thrown at xtask/src/license_headers_check.rs:1177

        let expected_version = format!("={expected_version}");

        for (dep_name, dep) in doc
            .dependencies("dependencies")
            .iter()
            .chain(doc.dependencies("build-dependencies").iter())
        {
            if dep_name.starts_with("slint") || dep_name.starts_with("i-slint") {
                match dep {
                    CargoDependency::Workspace => (),
                    CargoDependency::Full { path, version } => {
                        if path.is_empty() {
                            return Err(anyhow!(
                                "slint package '{}' outside of the repository?",
                                dep_name
                            ));
                        }
                        if version != &expected_version {
                            return Err(anyhow!(
                                "Version \"{}\" must be specified for dependency {}",
                                expected_version,
                                dep_name
                            ));
                        }
                    }
                }
            }
        }

        for (dep_name, dep) in doc.dependencies("dev-dependencies").iter() {
            if dep_name.starts_with("slint") || dep_name.starts_with("i-slint") {
                match dep {
                    CargoDependency::Workspace => {
                        return Err(anyhow!(
                            "dev-dependencies cannot be from the workspace because version must be empty {dep_name}"
                        ));
                    }

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