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merge rustc_attr_data_structures into rustc_hir this move was discussed on zulip: [#t-compiler > attribute parsing rework @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/attribute.20parsing.20rework/near/528530091) Many PRs in the attribute rework depend on this move.
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.