This uses the expression static analysis features to interpret
a combination of static calls and static traversals as the description
of a type.
This is intended for situations where applications need to accept type
information from their end-users, providing a concise syntax for doing
so.
Since this is implemented using static analysis, the type vocabulary is
constrained only to keywords representing primitive types and type
construction functions for complex types. No other expression elements
are allowed.
A separate function is provided for parsing type constraints, which allows
the additonal keyword "any" to represent the dynamic pseudo-type.
Finally, a helper function is provided to convert a type back into a
string representation resembling the original input, as an aid to
applications that need to produce error messages relating to user-entered
types.
