SetBind, SetPlusBind...

[lambdageek]

Unbound/RepLib had these additional binders that allow you to express patterns where the bound names are treated in such a way that their order doesn't matter. (For example you could create a term local x=1, y=2 in e((x,y)) which is alpha-equivalent to local y=2, x=1 in e.)

It should be pretty straightforward to add this back in. All the magic is in the smart constructors setbind and setplusbind. (One would also need to generalize Bind to GenBind as in Unbound. No big deal)