2 "std::collections::HashMap",
3 "std::sync::atomic::AtomicU32",
9 "std::primitive::usize",
11 # can give path and reason with an inline table
12 { path = "std::net::Ipv4Addr", reason = "no IPv4 allowed" },
13 # can use an inline table but omit reason
14 { path = "std::net::TcpListener" },