Changes between Version 237 and Version 238 of TypeFunctionsStatus
- Sep 29, 2007 2:30:48 PM (7 years ago)
v237 v238 23 23 24 24 '''Debugging of type families:''' 25 25 26 0. `substEqInDict` needs to be symmetric (i.e., also apply right-to-left rules); try to re-use existing infrastructure. It would be neater, easier to understand, and more efficient to have one loop that goes for a fixed point of simultaneously rewriting with given_eqs, wanted_eqs, and type instances. 26 27 0. skolemOccurs for wanteds? At least `F a ~ [G (F a)]` and similar currently result in an occurs check error. Without skolemOccurs in wanted, the occurs check for wanted would need to be smarter (and just prevent cyclic substitutions of the outlined form silently). However, when inferring a type, having the rewrites enabled by skolemOccurs available will leads to potentially simpler contexts.