7b0236fbd8
Fix autodiff empty ret regression closes https://github.com/rust-lang/rust/issues/147144 The two gsoc summer projects caused a bit of churn, which was to be expected, especially since we don't run autodiff in CI yet. This adds a void return testcase that we should have had anyway, and fixes the regression. r? `@Zalathar` (Just guessing since I've seen you in a few LLVM PRs and Oli is probably still busy. Feel free to reroll!)
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.