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The related bugs are #8553 and #8525.

one for constraints, one for type families

This is related to #8541.

uname -s
  msys gives "MINGW32"
  msys2 gives "MINGW_NT-6.2"

The peak-megabytes is vulnerable to when GC runs, but
the bytes-allocated on 5030 shows a big reduction from
466Mbytes to 367Mbytes.

This follows the arity improvement and CSE patches

as they fail in a non-helpful way otherwise. This should help the
testsuite pass on travis.

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

The error message for ghci052 and ghci053 are (still)
terrible, because there is shadowing going on in the
interactive context.  But that's a separate matter.

Signed-off-by: Austin Seipp <austin@well-typed.com>