Dmd allows declaring something like const(int) a = 3; However, the grammar cannot parse this as written. Declaration Decl StorageClasses Decl const Decl FAILURE The () can't be parsed. http://digitalmars.com/d/2.0/arrays.html#strings is the first example of this syntax in the docs with immutable(char)[].
changeset 1423
Fixed dmd 2.041