Error handling.

examples/error_handling_demo.rc

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+int deep_function_3() {
+    int result = non_existent_variable * 5;
+    return result;
+}
+
+int deep_function_2(int x) {
+    printf("In deep_function_2 with x=%d\n", x);
+    int value = deep_function_3();
+    return value + x;
+}
+
+int deep_function_1(int a, int b) {
+    printf("In deep_function_1 with a=%d, b=%d\n", a, b);
+    int sum = a + b;
+    int result = deep_function_2(sum);
+    return result;
+}
+
+int main() {
+    printf("=== Error Handling Demonstration ===\n");
+    printf("This program will intentionally trigger an error\n");
+    printf("to demonstrate the enhanced error reporting system.\n\n");
+
+    int final_result = deep_function_1(10, 20);
+    printf("Final result: %d\n", final_result);
+
+    return 0;
+}