Fix buildc (#62)

* mio requires net feature

* Doc comments required

Author: mystenmark

msim-tokio/Cargo.toml

@@ -64,5 +64,5 @@ tracing = "0.1"
 real_tokio = { git = "https://github.com/MystenLabs/tokio-msim-fork.git", rev = "7329bff6ee996d8df6cf810a9c2e59631ad5a2fb", package = "real_tokio", features = ["full"] }
 bytes = { version = "1.1" }
 futures = { version = "0.3.0", features = ["async-await"] }
-mio = { version = "0.8.1" }
+mio = { version = "0.8.1", features = ["net"] }
 libc = "0.2"

msim/src/sim/time/mod.rs

@@ -252,6 +252,8 @@ pub async fn advance(_duration: Duration) {
     unimplemented!("cannot advance clock in simulation - use sleep() instead");
 }
 
+/// Supply tokio::time::pause() API (for compilation only - this method is meaningless inside the
+/// simulator).
 pub fn pause() {
     unimplemented!("cannot pause clock in simulation");
 }