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with import ./lib.nix;

let
  as = { x.y.z = 123; a.b.c = 456; };
  bs = { f-o-o.bar = "foo"; };
  or = x: y: x || y;
in
[
  as.x.y.z
  as.foo or "foo"
  as.x.y.bla or as.a.b.c
  as.a.b.c or as.x.y.z
  as.x.y.bla or bs.f-o-o.bar or "xyzzy"
  as.x.y.bla or bs.bar.foo or "xyzzy"
  (123).bla or null.foo or "xyzzy"
  # Backwards compatibility test for `fun or` being handled as intended.
  # n.b. this code contains a type error, because the nul value should be false instead of [].
  # but the code expands to `true || (false || (false || [])))`, so as long as at least one value in the list is true
  # it short-circuits and never runs into the type error
  (fold or [] [true false false])
]