Fix nested comma handling in a backquote

src/function/builtin/BackquoteEvaluator.java

@@ -57,6 +57,8 @@ class BackquoteEvaluator {
             throw new AtSignNotInCommaException();
         else if (expression.isComma())
             resolveCommaExpression(expression);
+        else if (expression.isList())
+            resolveListExpression(expression);
         else
             addResolvedExpression(expression);
     }
@@ -122,6 +124,11 @@ class BackquoteEvaluator {
         leader = (Cons) leader.getRest();
     }
 
+    private void resolveListExpression(SExpression expression) {
+        BackquoteEvaluator evaluator = new BackquoteEvaluator(new BackquoteExpression(expression));
+        addResolvedExpression(evaluator.evaluate());
+    }
+
     private static class CommaEvaluationResult {
 
         private SExpression result;

test/function/builtin/EVALTester.java

@@ -148,4 +148,18 @@ public class EVALTester {
         assertIsErrorWithMessage(new UnmatchedAtSignException());
     }
 
+    @Test
+    public void evalQuoteInNestedList() {
+        String input = "(let ((g 27)) `((,g)))";
+
+        assertSExpressionsMatch(parseString("((27))"), evaluateString(input));
+    }
+
+    @Test
+    public void evalAtSignInNestedList() {
+        String input = "(let ((g '(1 2 3))) `((,@g)))";
+
+        assertSExpressionsMatch(parseString("((1 2 3))"), evaluateString(input));
+    }
+
 }