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Jon Ross-Perkins
2adaeee2ba
This starts handling return types on functions, and comparing types with `return` statements. Note, errors remain poor because the type literal is currently associated with a builtin, losing the parse_node that specified it. This means we don't have the original source location to associate with, even though it may be helpful to point at the type in source. We could point at the signature overall, but my leaning is that we wouldn't want that long-term, so TODOs for now and may want to change a little about how the parse node is tracked once things are a little further along.