diff --git a/kipina-codebench/benchmark.mjs b/kipina-codebench/benchmark.mjs
index 7756196..d2e82d0 100644
--- a/kipina-codebench/benchmark.mjs
+++ b/kipina-codebench/benchmark.mjs
@@ -389,8 +389,43 @@ async function runPipeline(model, scenario) {
         const missing = LCONF.required.filter(f => !files[f]);
         if (missing.length > 0) { result.error = `Puuttuvat: ${missing.join(', ')}`; return result; }
 
-        // 4. Validointi + korjaussilmukka (Python-spesifi)
+        // 4. Validointi + korjaussilmukka
         let fixRound = 0;
+        if (LANG === 'rust') {
+            // Rust: cargo check Docker-kontissa ennen testejä
+            for (let checkRound = 0; checkRound < MAX_FIX_ROUNDS; checkRound++) {
+                // Kirjoita tiedostot levylle
+                for (const [fn, content] of Object.entries(files)) {
+                    const filePath = join(dir, fn);
+                    mkdirSync(dirname(filePath), { recursive: true });
+                    writeFileSync(filePath, content);
+                }
+                console.log(`    [4/5] Cargo check${checkRound > 0 ? ` (korjaus ${checkRound})` : ''}...`);
+                let checkOut = '';
+                try {
+                    checkOut = execSync(
+                        `docker run --rm --entrypoint sh -v "${dir}:/src:ro" ${LCONF.dockerImage} -c "cp -r /src/* . && cargo check 2>&1"`,
+                        { timeout: 300000, encoding: 'utf-8' }
+                    );
+                } catch (e) {
+                    checkOut = e.stdout || e.stderr || e.message || '';
+                }
+                const compileErrors = checkOut.split('\n').filter(l => /^error/.test(l));
+                if (compileErrors.length === 0) break;  // Kääntyy — jatka testeihin
+
+                console.log(`    [4/5] ${compileErrors.length} käännösvirhettä — korjataan...`);
+                fixRound++;
+                const errorLines = checkOut.split('\n').filter(l => /^error|^\s+-->/.test(l)).slice(0, 30).join('\n');
+                const allCode = Object.entries(files).map(([fn, c]) => `=== ${fn} ===\n${c}`).join('\n\n');
+                const fixPrompt = `Fix the following Rust compilation errors. Return ALL files with === markers.\n\nERRORS:\n${errorLines}\n\nCURRENT CODE:\n${allCode}`;
+                const fixResp = await ollamaChat(model, fixPrompt, CODE_SYSTEM, 12288);
+                timings.push(fixResp);
+                const fixedFiles = parseGeneratedFiles(fixResp.text);
+                for (const [fn, content] of Object.entries(fixedFiles)) {
+                    if (LCONF.required.includes(fn)) files[fn] = content;
+                }
+            }
+        }
         if (LANG === 'python') {
             let issues = validateProjectCode(files);
             while (issues.length > 0 && fixRound < MAX_FIX_ROUNDS) {