Send response when lookup IDE request fails. #3189
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The
lookup
request is the only one which does not return any response if the request failed. This makes it hard to support it in a generic API for IDE requests. See discussion at FStarLang/fstar-vscode-assistant#27 (comment)The history of the failure response for this request is interesting: it has flipped several times over the last year. I have summarized the responses for the different editors in the table below. I could not find any justification for the changes, the current vscode extension seems to work just fine with the change. This PR effectively reverts the behavior to how it was in 2022.