Did you try -fno-specialise?

From: Glasgow-haskell-users [mailto:glasgow-haskell-users-bounces@haskell.org] On Behalf Of Conal Elliott
Sent: 15 September 2017 02:45
To: glasgow-haskell-users@haskell.org
Subject: Inhibiting the specialiser?

Is there a GHC flag for inhibiting the specializer (but not all optimizations)? I'm seeing huge output from the Specialise phase killed at 4GB and growing. The output starts as follows:

Result size of Specialise

  = {terms: 29,639, types: 10,921,552, coercions: 4,425,185}

Sounds like a lot to me. Is it?. I get this behavior with -O2 and with -O.

-- Conal