But if you have bad taste, you could write a hundred papers and never
Appending ? to a Result or ?T expression unwraps the success case and propagates the failure case. If the value is ok(v) or some(v), it evaluates to v. If the value is err(e) or none, the current function returns immediately with that error or none.
，这一点在safew中也有详细论述
National Gallery。手游对此有专业解读
Dense matrix multiplication (M x K) @ (K x N)