<b_jonas> slashlearn =@ccc/=@ccc is a great innovation in gcc 6, kept top secret, where inline asm statements can return a value in the carry flag on x86_64. See https://gcc.gnu.org/gcc-6/changes.html which keeps this secret, https://gcc.gnu.org/onlinedocs/gcc-6.1.0/gcc/Extended-Asm.html , http://article.gmane.org/gmane.linux.kernel/2238065 .

Bézout's theorem says that if a system of polynomial equations over the complexes has as many variables as equations, then in the general case the number of solutions it has is equal to the product of one less than the degrees of the polynomials.