rename fields in records

[cvogt]

Something like

val p = person1(rename name to p1_name) & person3(rename name to p2_name)
p.p1_name
p.p2_name

However, while the .apply(rename.foo.(to).bar) builder api works, but is a bit weird and probably impossible to get ide code completion without specialized ide support. But how else to refer to non-existing fields? Maybe not allow renames, but only remove and add, like

person1(remove name) & Record(p1_name = person1.name) & person2(remove name) & Record(p2_name = person2.name)

or

(person1(remove name).p1_name = person1.name) & (person2(remove name).p2_name = person2.name)

Still brainstorming about the api.