TEST_NARROW_STD
TEST_NARROW_STD(stdin, getchar());
TEST_NARROW_STD(stdin, getchar_unlocked());
TEST_NARROW_STD(stdin, scanf("%s\n", buffer));
TEST_NARROW_STD(stdout, putchar('c'));
TEST_NARROW_STD(stdout, putchar_unlocked('c'));
TEST_NARROW_STD(stdout, puts("foo"));
TEST_NARROW_STD(stdout, printf("foo"));