title: What is a "default host triple" in Rust?
body: <p>While doing a custom installation of Rust on Windows 10, I am asked "Default host triple?"</p>
  
  <p>I have no clue what this is, and <a href="https://github.com/rust-lang-nursery/rustup.rs" rel="noreferrer">the Rustup repository page</a>, which came up in a web search, does not really explain it. </p>