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Is it LLVM IR --> C? Or Rust AST to C?

Found the answer in the project readme.

> My representation of .NETs IR maps nicely to C, which means that I was able to add support for compiling Rust to C in 2-3K LOC. Almost all of the codebase is reused, with the C and .NET specific code only present in the very last stage of compilation

Which might also allow one to use tools that work on .NET bytecode. They include verification, optimization, debugging, and other transpilers. You might also get a grant or job offer from MS Research. :)

It is a rustc backend, ie an alternative to llvm, gcc, or the cranelift backends.

It started as a .NET backend but they found that their approach could easily support C code generation as well so they added that. They do this by turning what rustc gives them into their own IR.

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