Changes between Version 265 and Version 266 of TypeFunctionsStatus


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Timestamp:
Nov 19, 2007 7:42:46 AM (6 years ago)
Author:
chak
Comment:

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  • TypeFunctionsStatus

    v265 v266  
    5252    * CLEANUP: 
    5353     * `TcPat.refineAlt`: This function is now dead code, so is all its support code. 
     54     * `pat_reft` field of `TcPat.PatState`: Not needed anymore and code maintaining can go, too. 
    5455 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. 
    5556 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.