Error: Debug Failure. False expression. in 'doChange' during 'getCodeFixes'

[typescript-bot]

This issue comes from crash dumps in telemetry. We've tried to de-duplicate issues on a best-effort basis, comparing the sequence of methods called and the command requested while ignoring line numbers.
TypeScript version prefix: 3.5.3
VSCode version: 1.37.0
Command requested: getCodeFixes
Hitting sessions: 749
Five line hash: d8ddc31dc603a09c9deda8393918dd1f
Stack:

    at doChange (tsserver.js:116689:22)
    at <anonymous> (tsserver.js:116680:96)
    at ChangeTracker.with (tsserver.js:111861:17)
    at getCodeActions (tsserver.js:116680:64)
    at <anonymous> (tsserver.js:112847:121)
    at flatMap (tsserver.js:573:25)
    at getFixes (tsserver.js:112847:23)
    at <anonymous> (tsserver.js:122423:35)
    at flatMap (tsserver.js:573:25)
    at getCodeFixesAtPosition (tsserver.js:122421:23)
    at unknown (suppressed.js)
    at unknown (suppressed.js)
    at Session.getCodeFixes (tsserver.js:131477:64)
    at _a.<computed> (tsserver.js:130227:61)
    at <anonymous> (tsserver.js:131671:88)
    at Session.executeWithRequestId (tsserver.js:131662:28)
    at Session.executeCommand (tsserver.js:131671:33)
    at Session.onMessage (tsserver.js:131693:35)
    at <anonymous> (tsserver.js:132984:27)
    at unknown (suppressed.js)
    at unknown (suppressed.js)
    at unknown (suppressed.js)
    at unknown (suppressed.js)
    at unknown (suppressed.js)
    at unknown (suppressed.js)
    at unknown (suppressed.js)
    at unknown (suppressed.js)
    at unknown (suppressed.js)

[typescript-bot]

This issue reproduced in the following context:
TypeScript version prefix: 3.6.2
VSCode version: 1.38.0-insider
Command requested: getCodeFixes
Hitting sessions: 273
Five line hash: 6c30c1e2d55feb61b1d0a73231b37bb9
Stack:

Error: Debug Failure. False expression.
    at doChange (tsserver.js:119978:22)
    at unknown (tsserver.js:119969:96)
    at Function.ChangeTracker.with (tsserver.js:114753:17)
    at Object.getCodeActions (tsserver.js:119969:64)
    at unknown (tsserver.js:115774:121)
    at Object.flatMap (tsserver.js:583:25)
    at Object.getFixes (tsserver.js:115774:23)
    at unknown (tsserver.js:125788:35)
    at Object.flatMap (tsserver.js:583:25)
    at Object.getCodeFixesAtPosition (tsserver.js:125786:23)
    at IOSession.Session.getCodeFixes (tsserver.js:134985:64)
    at Session.handlers.ts.createMapFromTemplate._a.(anonymous function) (tsserver.js:133772:61)
    at unknown (tsserver.js:135178:88)
    at IOSession.Session.executeWithRequestId (tsserver.js:135169:28)
    at IOSession.Session.executeCommand (tsserver.js:135178:33)
    at IOSession.Session.onMessage (tsserver.js:135201:35)
    at Interface.<anonymous> (tsserver.js:136516:27)
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()

[typescript-bot]

This issue reproduced in the following context:
TypeScript version prefix: 3.6.3
VSCode version: 1.39.0-insider
Command requested: getCodeFixes
Hitting sessions: 494
Five line hash: 6c30c1e2d55feb61b1d0a73231b37bb9
Stack:

Error: Debug Failure. False expression.
    at doChange (tsserver.js:120056:22)
    at unknown (tsserver.js:120047:96)
    at Function.ChangeTracker.with (tsserver.js:114831:17)
    at Object.getCodeActions (tsserver.js:120047:64)
    at unknown (tsserver.js:115852:121)
    at Object.flatMap (tsserver.js:583:25)
    at Object.getFixes (tsserver.js:115852:23)
    at unknown (tsserver.js:125866:35)
    at Object.flatMap (tsserver.js:583:25)
    at Object.getCodeFixesAtPosition (tsserver.js:125864:23)
    at suppressed_frame()
    at suppressed_frame()
    at IOSession.Session.getCodeFixes (tsserver.js:135063:64)
    at Session.handlers.ts.createMapFromTemplate._a.(anonymous function) (tsserver.js:133850:61)
    at unknown (tsserver.js:135256:88)
    at IOSession.Session.executeWithRequestId (tsserver.js:135247:28)
    at IOSession.Session.executeCommand (tsserver.js:135256:33)
    at IOSession.Session.onMessage (tsserver.js:135279:35)
    at Interface.<anonymous> (tsserver.js:136594:27)
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()

[typescript-bot]

This issue reproduced in the following context:
TypeScript version prefix: 3.6.4
VSCode version: 1.39.1
Command requested: getCodeFixes
Hitting sessions: 129
Five line hash: 6c30c1e2d55feb61b1d0a73231b37bb9
Stack:

Error: Debug Failure. False expression.
    at doChange (tsserver.js:120065:22)
    at unknown (tsserver.js:120056:96)
    at Function.ChangeTracker.with (tsserver.js:114840:17)
    at Object.getCodeActions (tsserver.js:120056:64)
    at unknown (tsserver.js:115861:121)
    at Object.flatMap (tsserver.js:583:25)
    at Object.getFixes (tsserver.js:115861:23)
    at unknown (tsserver.js:125875:35)
    at Object.flatMap (tsserver.js:583:25)
    at Object.getCodeFixesAtPosition (tsserver.js:125873:23)
    at IOSession.Session.getCodeFixes (tsserver.js:135072:64)
    at Session.handlers.ts.createMapFromTemplate._a.(anonymous function) (tsserver.js:133859:61)
    at unknown (tsserver.js:135265:88)
    at IOSession.Session.executeWithRequestId (tsserver.js:135256:28)
    at IOSession.Session.executeCommand (tsserver.js:135265:33)
    at IOSession.Session.onMessage (tsserver.js:135288:35)
    at Interface.<anonymous> (tsserver.js:136603:27)
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()

[typescript-bot]

This issue reproduced in the following context:
TypeScript version prefix: 3.7.2
VSCode version: 1.41.0-insider
Command requested: getCodeFixes
Hitting sessions: 786
Five line hash: 6c30c1e2d55feb61b1d0a73231b37bb9
Stack:

Error: Debug Failure. False expression: token and statement should start at the same point
    at doChange (tsserver.js:125030:22)
    at unknown (tsserver.js:125021:96)
    at Function.ChangeTracker.with (tsserver.js:119320:17)
    at Object.getCodeActions (tsserver.js:125021:64)
    at unknown (tsserver.js:120361:121)
    at Object.flatMap (tsserver.js:468:25)
    at Object.getFixes (tsserver.js:120361:23)
    at unknown (tsserver.js:131044:35)
    at Object.flatMap (tsserver.js:468:25)
    at Object.getCodeFixesAtPosition (tsserver.js:131042:23)
    at suppressed_frame()
    at suppressed_frame()
    at IOSession.Session.getCodeFixes (tsserver.js:140677:64)
    at Session.handlers.ts.createMapFromTemplate._a.<computed> (tsserver.js:139462:61)
    at unknown (tsserver.js:140870:88)
    at IOSession.Session.executeWithRequestId (tsserver.js:140861:28)
    at IOSession.Session.executeCommand (tsserver.js:140870:33)
    at IOSession.Session.onMessage (tsserver.js:140893:35)
    at Interface.<anonymous> (tsserver.js:142208:27)
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()

[typescript-bot]

This issue reproduced in the following context:
TypeScript version prefix: 3.7.3
VSCode version: 1.41.0-insider
Command requested: getCodeFixes
Hitting sessions: 799
Five line hash: 6c30c1e2d55feb61b1d0a73231b37bb9
Stack:

Error: Debug Failure. False expression: token and statement should start at the same point
    at doChange (tsserver.js:125070:22)
    at unknown (tsserver.js:125061:96)
    at Function.ChangeTracker.with (tsserver.js:119360:17)
    at Object.getCodeActions (tsserver.js:125061:64)
    at unknown (tsserver.js:120401:121)
    at Object.flatMap (tsserver.js:468:25)
    at Object.getFixes (tsserver.js:120401:23)
    at unknown (tsserver.js:131084:35)
    at Object.flatMap (tsserver.js:468:25)
    at Object.getCodeFixesAtPosition (tsserver.js:131082:23)
    at IOSession.Session.getCodeFixes (tsserver.js:140724:64)
    at Session.handlers.ts.createMapFromTemplate._a.<computed> (tsserver.js:139509:61)
    at unknown (tsserver.js:140917:88)
    at IOSession.Session.executeWithRequestId (tsserver.js:140908:28)
    at IOSession.Session.executeCommand (tsserver.js:140917:33)
    at IOSession.Session.onMessage (tsserver.js:140940:35)
    at Interface.<anonymous> (tsserver.js:142255:27)
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()

[DanielRosenwasser]

Here's a repro

// @noUnreachableCode: true

function foo() {
    return 100;
    foo/*cursor*/
}

[typescript-bot]

This issue reproduced in the following context:
TypeScript version prefix: 3.7.4
VSCode version: 1.41.1
Command requested: getCodeFixes
Hitting sessions: 330
Five line hash: 6c30c1e2d55feb61b1d0a73231b37bb9
Stack:

Error: Debug Failure. False expression: token and statement should start at the same point
    at doChange (tsserver.js:125072:22)
    at unknown (tsserver.js:125063:96)
    at Function.ChangeTracker.with (tsserver.js:119362:17)
    at Object.getCodeActions (tsserver.js:125063:64)
    at unknown (tsserver.js:120403:121)
    at Object.flatMap (tsserver.js:468:25)
    at Object.getFixes (tsserver.js:120403:23)
    at unknown (tsserver.js:131086:35)
    at Object.flatMap (tsserver.js:468:25)
    at Object.getCodeFixesAtPosition (tsserver.js:131084:23)
    at suppressed_frame()
    at suppressed_frame()
    at IOSession.Session.getCodeFixes (tsserver.js:140739:64)
    at Session.handlers.ts.createMapFromTemplate._a.<computed> (tsserver.js:139524:61)
    at unknown (tsserver.js:140932:88)
    at IOSession.Session.executeWithRequestId (tsserver.js:140923:28)
    at IOSession.Session.executeCommand (tsserver.js:140932:33)
    at IOSession.Session.onMessage (tsserver.js:140955:35)
    at Interface.<anonymous> (tsserver.js:142270:27)
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()
    at suppressed_frame()

[andrewbranch]

@DanielRosenwasser where were you able to repro this? I can repro in the playground, but not in VS Code or fourslash 🤔

[DanielRosenwasser]

Same, I can't repro this locally, but it was happening at the time. Not sure what's up there.