When I compile Data.Sequence with -dppr-debug, I get several messages about constructor specialization exceeding the call pattern limit. Things like SpecConstr Function ‘$j_ssfy{v} [lid]’ has four call patterns, but the limit is 3 Use -fspec-constr-count=n to set the bound Specialisations: [([sc_sAZr{v} [lid]], [sc_sAZr{v} [lid], lvl_sdmH{v} [lid]]), ([sc_sAZs{v} [lid]], [sc_sAZs{v} [lid], lvl_sw9X{v} [lid]]), ([sc_sAZt{v} [lid]], [sc_sAZt{v} [lid], lvl_swa0{v} [lid]]), ([sc_sAZu{v} [lid]], [sc_sAZu{v} [lid], lvl_swat{v} [lid]])] How can I figure out what function this sort of thing is actually talking about? I'd love to see what benchmarks say about whether tweaking -fspec-constr-count is a good idea, but I don't know what to benchmark. Thanks, David