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Zalathar
078144fdfa
This case can't actually happen yet (other than via a testing flag), because currently all of a function's spans must belong to the same file and expansion. But this will be an important edge case when adding expansion region support.
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.