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Improve type checking of generic function bodies (#1580)
This commit series gives type variable ids their own type and replaces the class/function type variable distinction with a plain/metavariable distinction. The main goal is to fix #603, but it's also progress towards #1261 and other bugs involving type variable inference. Metavariables (or unification variables) are variables introduced during type inference to represent the types that will be substituted for generic class or function type parameters. They only exist during type inference and should never escape into the inferred type of identifiers. Fixes #603.
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