43e17454e2
Its usage was removed in 5e624bf4ba and 093b075d32, so we do not need to keep it around any longer. According to [preliminary input](https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/Find.20.60rustc_driver.60.20dependent.20projects.3F/near/304490764), we do not need to worry about any deprecation cycle for this API and can just straight up remove it. Migration instructions for remaining clients -------------------------------------------- Change from ```rust extern crate rustc_driver; fn main() { rustc_driver::set_sigpipe_handler(); // ... ``` to ```rust fn main() { // ... ```
The driver crate is effectively the "main" function for the rust
compiler. It orchestrates the compilation process and "knits together"
the code from the other crates within rustc. This crate itself does
not contain any of the "main logic" of the compiler (though it does
have some code related to pretty printing or other minor compiler
options).
For more information about how the driver works, see the rustc dev guide.