Richard,
In an effort to figure out why programs with lots of type families have
become so much slower over the last few GHC releases, I've been looking at
GHC Trac #12545 [1], which provides a very self-contained test case that
became considerably slower to compile from GHC 7.10 to 8.0. Thanks to
> On May 31, 2017, at 5:21 PM, Ryan Scott wrote:
> Does you know what might be going on here?
I think so, but I don't know how to fix it.
The commit you found (thank you!) makes simple_opt_expr (the "simple
optimizer", run directly after desugaring, even with -O0) a little more
selective in w
