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Wesley Wiser
f74896fc01
It isn't necessary to declare the option as a top-level flag when it is accessible from `unstable_opts`.
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.