kaelingre

I haven't heard of Oscar.jl, thanks for the hint! I'll check it out.

Here's the simplest C example where this happened to me: ``` #include int main() { fmpz_mpoly_ctx_struct ctx; fmpz_mpoly_ctx_init(&ctx, 2, ORD_LEX); fmpz_mpoly_struct x1; fmpz_mpoly_init(&x1, &ctx); fmpz_mpoly_gen(&x1, 0, &ctx); fmpz_mpoly_struct x2; fmpz_mpoly_init(&x2,...

Alright, the problem is that the function _fmpz_mpoly_compose_mat(A,B,...) requires A!=B. There's an assert which would have caught the above problem, had I turned on asserts.