Error handling for trying to render callable builtins #5463 #6388
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I think this resolves #5463. Arguably that issue wasn't a bug per-se but it was a very opaque behaviour. This adds a wrapper around functions so that if we try and do non-function like things to them, they throw up a more useful error.
In doing that I've pulled the definitions for builtin classes out into a different module. There was a comment in the old code saying that the old location wasn't great, and I think this is an improvement.