Mark generated rust sim impl's with #[automatically_derived]

This prevents the compiler from performing expensive and unnecessary lints on the generated code, saving several seconds and, more importantly, several GB(!!) of memory during compilation of large sims.

See rust-lang/rust#79671 (comment) for more info.

Author: yupferris

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- Mark generated rust simulator impl's with `#[automatically_derived]` to skip expensive lints during compilation.
 
 ## [0.1.14] - 2020-11-29
 ### Changed

kaze/src/sim.rs

@@ -280,6 +280,7 @@ pub fn generate<'a, W: Write>(
     w.append_line("}")?;
     w.append_newline()?;
 
+    w.append_line("#[automatically_derived]")?;
     w.append_indent()?;
     w.append("impl")?;
     if options.tracing {