Is there lost one line as use std::mem; in README.md?
When I run sample step by step follow README.md,I got same error，but when I add use std::mem; ，cargo build successfully，but when I delete use std::mem;，and run cargo clean &cargo build，none error found。
I do not know why，but it seems something wrong。
Is there lost one line as
use std::mem;in README.md?When I run sample step by step follow README.md,I got same error，but when I add
use std::mem;，cargo build successfully，but when I deleteuse std::mem;，and runcargo clean &cargo build，none error found。I do not know why，but it seems something wrong。