doc/guide/src/Immutable.adoc

   1 Immutable
   2 =========
   3
   4 Immutable means not <:Mutable:mutable> and is an adjective meaning
   5 "can not be modified".  Most values in <:StandardML:Standard ML> are
   6 immutable.  For example, constants, tuples, records, lists, and
   7 vectors are all immutable.