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Mark Rousskov
6458ca5349
Both zstd and zlib are *known* compression algorithms, they just may not be supported by the backend. We shouldn't mislead users into e.g. thinking they made a typo.
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.