Diff GHC Core programs.
CoreDiff improves upon diff by assimilating terms before they are compared.
Alpha-equivalent terms don't show up as differences.
This is useful for finding the differences in Core-to-Core transformations that two versions of GHC performed.
CoreDiff expects two CBOR files exported by ghc-dump as its input:
$ mkdir ghcX ghcY
$ ghcX -O2 Fac.hs -fplugin GhcDump.Plugin -dumpdir ghcX
$ ghcY -O2 Fac.hs -fplugin GhcDump.Plugin -dumpdir ghcY
$ corediff diff ghcX/Fac.pass-0000.cbor ghcY/Fac.pass-0000.cbor
...
For playing around, there is a bunch of CBOR files in the demos directory of this repo.