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3780684f5a
Previously, directly tagged enums had a `variant$` field which would show the name of the active variant. We now show the variant using a `[variant]` synthetic item just like we do for niche-layout enums.
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.