Debugging annotation machinery

Carter Schonwald carter.schonwald at
Mon Jan 4 23:32:36 UTC 2021

I don’t have good debugging wisdom, but I’d love to know what hash
functions you’re considering!

On Mon, Jan 4, 2021 at 2:22 AM Phyx <lonetiger at> wrote:

> Hi,
> I am changing the hashing algorithm used to create Fingerprints but
> somehow the annrun01.hs test has started failing and I don't quite
> understand why.
> From what I can tell the failure happens during deserialization but the
> module itself is still found.
> The calls findGlobalAnns deserializeWithData target seem to return nothing.
> Calling ~/ghc/inplace/bin/ghc-stage2.exe --show-iface Annrun01_Help.hi
> shows that GHC itself understands the module fine though.
> Does someone have an idea why deserialization might be failing? but also
> how does one debug this? Almost none of the structures have a Show or
> Outputable instance...
> Thanks,
> Tamar
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