title: Why did Rust remove the green-threading model; what's the disadvantage?
body: <p>Runtime freedom: Rust’s runtime system and green-threading model has been entirely removed, which cut the static binary size of “hello world” in half and has opened the door to lower-level hooks into the standard library. Implemented by Aaron Turon.</p>
  
  <p><a href="http://blog.rust-lang.org/2015/01/09/Rust-1.0-alpha.html" rel="noreferrer">http://blog.rust-lang.org/2015/01/09/Rust-1.0-alpha.html</a></p>
  
  <p>What's the disadvantage of the green-threading model?</p>
  
  <p>Why is Erlang so fast?</p>