A value that may be absent. The parameter is the value's type, so
`StdOption` is one family used at every element type rather than one family
per type.
25family StdOption : Type 0
26parameter erased stdOptionElement : Type 0
27constructor StdNone
28constructor StdSome
29field unrestricted stdSomeValue : stdOptionElementThe compiler supplied declaration spans and resolved links from this source snapshot. This page does not assert that this file belongs to a checked closure.