False positive "vertex unreachable from any range"

[felixfbecker]

An LSIF exporter for a lint tool may only export Document vertices that are linked to diagnosticresult vertices, without any ranges. This currently errors in the tool.

[efritz]

Can you give sample input? We haven't considered diagnostics in LSIF at all up to this point.

[felixfbecker]

There's sample input in the spec that should reproduce it: https://github.com/microsoft/language-server-protocol/blob/master/indexFormat/specification.md#request-textdocumentdiagnostic