For three years, the biggest complaint about Mojo was not the syntax, the performance claims, or the missing ecosystem. It was that the compiler was closed. You could read the standard library, you could file issues, but the thing that turned your code into GPU machine instructions was a binary you had to download on faith. For a language whose creator, Chris Lattner, built his reputation on LLVM and Swift, two of the most open projects in compiler history, that sat badly with a lot of developer...