GitHub Copilot sort of does that in a way that is both worse and better than the proposal.
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Worse in that it doesn’t really know the types and possible values as a deterministic compiler.
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Better in that it suggests based on context and likelihood, so suggests common idioms both community-wide and possibly project/file-specific.
Other LLM coding tools probably give a similar experience.
For the complete list, I also think it is unfortunately too long to be useful, unless there’s a good ranking mechanism to show us what we are more likely to want in the context (in which case we’re back to LLM territory, perhaps?).
