castable_to_type
static_assert(castable_to_type(n, pgoff_t)); \
static_assert(castable_to_type(n, pgoff_t)); \
static_assert(castable_to_type(n, pgoff_t)); \
static_assert(castable_to_type(n, pgoff_t)); \
static_assert(castable_to_type(n, pgoff_t)); \
static_assert(castable_to_type(n, pgoff_t)); \
static_assert(castable_to_type(n, pgoff_t)); \
bool __pass = castable_to_type(arg1, arg2); \