-
Simon Peyton Jones authored
There are two related changes in here a) Fix TcRnDriver.setInteractiveContext so that it initialises tcg_insts and tcg_fam_insts, as well as the corresponding tcg_inst_env and tcg_fam_inst_env fields. Vital! b) Fix FamInst.tcExtendLocalFamInstEnv for the GHCi case. It had a special HACK to allow family instances to be overridden in GHCi. Fair enough, but * It was only affecting the tcg_fam_inst_env, not tcg_fam_insts * It overrode home-package instances as well as ones entered at the GHCi prompt, which probably wasn't intended. I fixed both of these, and also narrowed the scope of what it does to override only *identical* instances, rather than any ones that conflict. If people yelp about this we can return to the question, but for now it narrows the range of the HACK
15ec8835