Assert tree-sitter validity in each AST test

crates/frontend/src/workspace.rs

@@ -321,3 +321,19 @@ pub fn ast_syntax_errors(db: &dyn Database, ast: AstNode) {
             .for_each(|child| ast_syntax_errors(db, *child));
     }
 }
+
+#[salsa::tracked]
+pub fn file_has_syntax_error(db: &dyn Database, file: File) -> bool {
+    ast_has_syntax_error(db, file.ast(db))
+}
+
+#[salsa::tracked]
+pub fn ast_has_syntax_error(db: &dyn Database, ast: AstNode) -> bool {
+    if ast.symbol(db) == "ERROR" {
+        true
+    } else {
+        ast.children(db)
+            .iter()
+            .any(|ast| ast_has_syntax_error(db, *ast))
+    }
+}

crates/frontend/tests/ast.rs

@@ -38,6 +38,12 @@ fn test_ast(path: &Path) -> datatest_stable::Result<()> {
     let uri = lsp_types::Url::from_file_path(&path).unwrap();
     let ed = Editor::new(&mut db, workspace, uri, &src);
 
+    // ensure tree-sitter has fully parsed
+    assert!(
+        !workspace::file_has_syntax_error(&db, ed.get_file()),
+        "test has syntax error"
+    );
+
     // list and parse top-level items
     ast::items(&db, ed.get_file()).into_iter().for_each(|meta| {
         ast::item(&db, meta);