zed-industries/zed · error

resolving a native parseable language cannot fail

Error message

resolving a native parseable language cannot fail

What it means

Asserts that resolving a native (non-WASM) grammar's language always succeeds — resolution here is just returning the statically linked tree-sitter language, which cannot fail by construction. The unwrap documents an invariant of native grammars; if it ever fires, the native grammar registry returned a grammar whose native handle is absent, i.e., an internal registration bug rather than bad input.

Source

Thrown at crates/language_core/src/grammar.rs:341

            .ok()
            .and_then(|ts_language| Query::new(&ts_language, "(ERROR) @error").ok());
        Self {
            id: GrammarId::new(),
            highlights_config: None,
            brackets_config: None,
            outline_config: None,
            text_object_config: None,
            indents_config: None,
            injection_config: None,
            override_config: None,
            redactions_config: None,
            runnable_config: None,
            error_query,
            debug_variables_config: None,
            #[cfg(not(target_family = "wasm"))]
            ts_language: parseable_language
                .resolve()
                .expect("resolving a native parseable language cannot fail"),
            #[cfg(target_family = "wasm")]
            parseable_language,
            highlight_map: Default::default(),
        }
    }

    /// A parseable [`tree_sitter::Language`] valid on the calling thread.
    ///
    /// See [`ParseableLanguage`] for why this is a resolution rather than a
    /// field access on WebAssembly.
    pub fn parseable_language(&self) -> Result<tree_sitter::Language> {
        #[cfg(not(target_family = "wasm"))]
        {
            Ok(self.ts_language.clone())
        }
        #[cfg(target_family = "wasm")]
        {
            self.parseable_language.resolve()

View on GitHub (pinned to 9d272b0363)

Solutions

1. Audit native grammar registration to ensure every native Grammar carries its tree-sitter language
2. Return a Result from resolution and surface a descriptive error listing the grammar name
3. Add a registration test that resolves every native grammar once

When it happens

Trigger: Thrown at crates/language_core/src/grammar.rs:339 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@9d272b0363 (2026-08-20). Data as JSON: /api/errors/c7d86848e82b2ca5. Report an issue: GitHub.