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That's a bit tricky, but should be possible to do with a custom parser. I don't think it's a good idea to make this the default behavior as may be confusing which types are compatible with each other.

Essentially, for parsing, you could try to parse the type, and on success to return it, otherwise return the type's Defailt::default().

For complition, you still would need to parse the type, as the completion algorithm consumes tokens without validation and in general doesn't know how many tokens to consume.

My idea is:

• Run completion on the type, remember the suggestions;
• If the last token consumed was final, return the suggestions + the original token stream and a flag that's the value has been consumed;
• If not, parse the type:
  • on success, return the completion result;
  • on failure, return the original token stream with a value consumption flag set.

There may be some cases that I've missed here, I'd need to experiment with it when I have time to be sure.

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Ok, thank you for your answer and your idea ! I'll try to make my own parser with that behavior.

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