astrid-runtime/astrid · error

Cargo build.target must be a string or array in

Error message

Cargo build.target must be a string or array in {}

What it means

Fired by CargoConfigState::absorb_document when `build.target` in a Cargo config file is neither a string nor an array (e.g. an inline table or boolean). Only those two forms match Cargo's accepted syntax.

Solutions

1. Set `build.target = "wasm32-unknown-unknown"` (string form)
2. Or use an array of target triples
3. Fix the TOML type in the offending config file

When it happens

Trigger: Thrown at crates/astrid-build/src/rust/config.rs:183 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of astrid-runtime/astrid@affd8760f4 (2026-09-09). Data as JSON: /api/errors/e55338d01cd2dabe. Report an issue: GitHub.

Appendix: source

Thrown at crates/astrid-build/src/rust/config.rs:183

        for include in cargo_config_includes(&doc, path)?.into_iter().flatten() {
            self.load(&include, state)?;
        }
        state.absorb_document(&doc, path)
    }
}

impl CargoConfigState {
    fn absorb_document(&mut self, doc: &toml_edit::DocumentMut, path: &Path) -> Result<()> {
        if let Some(item) = doc.get("build").and_then(|build| build.get("target")) {
            if let Some(value) = item.as_str() {
                self.target = Some(value.to_owned());
            } else if item.as_array().is_some() {
                // Cargo supports a target array for multi-target builds. This
                // packager has one executable slot, so it must not guess.
                self.target = None;
            } else {
                bail!(
                    "Cargo build.target must be a string or array in {}",
                    path.display()
                );
            }
        }

        if let Some(item) = doc.get("build").and_then(|build| build.get("rustflags")) {
            merge_rustflags(&mut self.build_flags, parse_rustflags(item, path)?);
        }
        if let Some(targets) = doc.get("target").and_then(toml_edit::Item::as_table_like) {
            for (platform, item) in targets.iter() {
                let Some(rustflags) = item
                    .as_table_like()
                    .and_then(|target| target.get("rustflags"))
                else {
                    continue;
                };
                self.target_entries

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