# Round-trip triad: Default (??) + Range (a..b)

# Before (sugar)
user_name = user?.profile?.name ?? "guest"
nums = 1 .. 5

# Canonical
# user_name = peek user { null => null, else => peek user.profile { null => null, else => user.profile.name } }
# nums = Range(1, 5)

# Round-Trip (expected)
# user_name = user?.profile?.name ?? "guest"
# nums = 1 .. 5