Assert failure tryReuseStructureFromOldProgram

[amcasey]

From 3.1.3:

Error processing request. Debug Failure. False expression.
Error: Debug Failure. False expression.
    at tryReuseStructureFromOldProgram (tsserver.js:84813:22)
    at Object.createProgram (tsserver.js:84506:34)
    at synchronizeHostData (tsserver.js:114685:26)
    at Object.getProgram (tsserver.js:114768:13)
    at InferredProject.Project.updateGraphWorker (tsserver.js:118814:53)
    at InferredProject.Project.updateGraph (tsserver.js:118762:42)
    at Object.updateProjectIfDirty (tsserver.js:119449:45)
    at InferredProject.Project.getLanguageService (tsserver.js:118459:28)
    at IOSession.Session.getCompletions (tsserver.js:122608:43)
    at Session.handlers.ts.createMapFromTemplate._a.(anonymous function) (tsserver.js:121665:61)
    at tsserver.js:123086:88
    at IOSession.Session.executeWithRequestId (tsserver.js:123077:28)
    at IOSession.Session.executeCommand (tsserver.js:123086:33)
    at IOSession.Session.onMessage (tsserver.js:123106:35)
    at Interface.<anonymous> (tsserver.js:124369:27)
    at emitOne (events.js:116:13)
    at Interface.emit (events.js:211:7)
    at Interface._onLine (readline.js:282:10)
    at Interface._normalWrite (readline.js:424:12)
    at Socket.ondata (readline.js:141:10)
    at emitOne (events.js:116:13)
    at Socket.emit (events.js:211:7)
    at addChunk (_stream_readable.js:263:12)
    at readableAddChunk (_stream_readable.js:250:11)
    at Socket.Readable.push (_stream_readable.js:208:10)
    at Pipe.onread (net.js:594:20)

[amcasey]

Command was completionInfo.

[amcasey]

Probably #27471

[sheetalkamat]

This is duplicate of #20795 as in confirmed that this is possible only if there was exception in the invocation of previous createProgram which resulted in us not creating new program and old program was partially used and still present as newProgram