Errors:
- Not supported
- Only * is supported
- Expected * in *, but got *
- Divergent type in (construct), (location 1), (location 2)
- Unknown field
- Unbounded variable
- Different variable
- Different domain
- * is not subclass of *
- Type not equal
- Incorrect number of parameters

Symbol Resolution:
- Add all files with annotated class/functions.
- Find class references, load them all in TopLevelContext.
- Find unbounded identifiers in the functions.
    - If it is a function/class name, record its object ID.
    - Otherwise, load its value. (check to see if specified with `global`)
      (Function implemented in python, with rust binding to add value to global
       variable dictionary)

Global variable dictionary:
- Primitives, including integers, floats, bools, etc.
- Primitive lists.
- Numpy multi-dimensional array, with value + dimension vectors.
- Reference array, with integer index referring to other things.
- Symbol table: python id -> reference id.

TopLevelContext/InferenceContext:
- Restrict visibility by user defined function.