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68b439c63b
avoid overflow when generating debuginfo for expanding recursive types Fixes #135093 Fixes #121538 Fixes #107362 Fixes #100618 Fixes #115994 The overflow happens because expanding recursive types keep creating new nested types when recurring into sub fields. I fixed that by returning an empty stub node when expanding recursion is detected.
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.