test2_tol
test2_tol(prefix##l, (y), (x), (result), \
test2_tol(func, (y), (x), (result), 0, (excepts))
test2_tol(prefix, (double)(y), (double)(x), (double)(result), \
test2_tol(prefix##f, (float)(y), (float)(x), (float)(result), \