expression type check #1

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pca006132 wants to merge 4 commits from pca006132/nac3:expression-type into master
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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
GlobalContext:
- Separate from typedefs
- Primitive Type Instance List
- Symbol Table (readable, ever defined)
- TypeVar definition stack
- Provide subst, inv_subst, blablabla
- Cache type var method lookup (dropped when related assumptions are changed)