Add tests/fail/f-echo-multiline.c

tests/fail/f-echo-multiline.c

@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main(void) {
+    int input;
+    scanf("%d", &input);
+    printf("%d\n", input);
+    printf("%d\n", input);
+    printf("%d\n", input);
+
+    return 0;
+}