debug: setting breakpoints while stepping causes step to be skipped

[suzmue]

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• Run code -v or code-insiders -v to get version of VS Code or VS Code Insiders
  • 1.50.0
• Check your installed extensions to get the version of the VS Code Go extension
  • developer build from master

Describe the bug

If during a next request, you try to modify the breakpoint (by setting, deleting a breakpoint etc) the step function does not complete.

Steps to reproduce the behavior:

main.go

package main

import (
	"fmt"
	"time"
)

func main() {
	time.Sleep(10000000000) // set a breakpoint here, then click next
	fmt.Println("bye")
}

launch.json:

{
    "version": "0.2.0",
    "configurations": [
      {
        "name": "Launch Package",
        "type": "go",
        "request": "launch",
        "program": "${workspaceFolder}",
        "trace": "verbose",
      }, 
    ]
  }

1. Run the program to a breakpoint on time.Sleep.
2. Click step over
3. Delete the breakpoint while the step is running
4. The program terminates and doesnt stop on "bye"

2020-10-14, 16:33:27.840 UTC
[16:33:27.840 UTC] From client: initialize({"clientID":"vscode","clientName":"Visual Studio Code","adapterID":"go","pathFormat":"path","linesStartAt1":true,"columnsStartAt1":true,"supportsVariableType":true,"supportsVariablePaging":true,"supportsRunInTerminalRequest":true,"locale":"en-us","supportsProgressReporting":true,"supportsInvalidatedEvent":true})
[16:33:27.840 UTC] InitializeRequest
[16:33:27.840 UTC] To client: {"seq":0,"type":"response","request_seq":1,"command":"initialize","success":true,"body":{"supportsConfigurationDoneRequest":true,"supportsSetVariable":true}}
[16:33:27.840 UTC] InitializeResponse
[16:33:27.840 UTC] From client: launch({"name":"Launch Package","type":"go","request":"launch","program":"/Users/suzmue/simpleproj","trace":"verbose","debugServer":4711,"packagePathToGoModPathMap":{"/Users/suzmue/simpleproj":"/Users/suzmue/simpleproj"},"apiVersion":2,"dlvLoadConfig":{"followPointers":true,"maxVariableRecurse":1,"maxStringLen":64,"maxArrayValues":64,"maxStructFields":-1},"showGlobalVariables":false,"dlvToolPath":"/Users/suzmue/go/bin/dlv","env":{"ELECTRON_RUN_AS_NODE":"1","USER":"suzmue","PATH":"/usr/local/git/current/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/local/go/bin:/Users/suzmue/go/bin","LOGNAME":"suzmue","SSH_AUTH_SOCK":"/private/tmp/com.apple.launchd.iaORmlkr6h/Listeners","HOME":"/Users/suzmue","SHELL":"/bin/bash","__CF_USER_TEXT_ENCODING":"0x74A6A:0x0:0x0","TMPDIR":"/var/folders/2x/hlwbwjzd1vd4brlfs80676fw00fkl_/T/","XPC_SERVICE_NAME":"com.microsoft.VSCode.5232","XPC_FLAGS":"0x0","ORIGINAL_XDG_CURRENT_DESKTOP":"undefined","VSCODE_NLS_CONFIG":"{\"locale\":\"en-us\",\"availableLanguages\":{},\"_languagePackSupport\":true}","VSCODE_LOGS":"/Users/suzmue/Library/Application Support/Code/logs/20201012T151609","VSCODE_IPC_HOOK":"/Users/suzmue/Library/Application Support/Code/1.50.0-main.sock","VSCODE_PID":"3178","SK_SIGNING_PLUGIN":"gnubbyagent","PWD":"/","SHLVL":"1","GITHUB_TOKEN":"_","GOPATH":"/Users/suzmue/go","_":"/Applications/Visual Studio Code.app/Contents/MacOS/Electron","AMD_ENTRYPOINT":"vs/workbench/services/extensions/node/extensionHostProcess","PIPE_LOGGING":"true","VERBOSE_LOGGING":"true","VSCODE_IPC_HOOK_EXTHOST":"/var/folders/2x/hlwbwjzd1vd4brlfs80676fw00fkl_/T/vscode-ipc-4c0c71e5-d9b0-42e3-a02b-a89e32b72ab3.sock","VSCODE_HANDLES_UNCAUGHT_ERRORS":"true","VSCODE_LOG_STACK":"true","APPLICATION_INSIGHTS_NO_DIAGNOSTIC_CHANNEL":"true","GOPROXY":"https://proxy.golang.org,direct","GOMODCACHE":"/Users/suzmue/go/pkg/mod"},"__sessionId":"d7604b91-4dc5-4474-a684-49f4b6797a6e"})
[16:33:27.841 UTC] LaunchRequest
[16:33:27.850 UTC] Using GOPATH: /Users/suzmue/go
[16:33:27.850 UTC] Using GOROOT: /usr/local/go
[16:33:27.851 UTC] Using PATH: /usr/local/git/current/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/local/go/bin:/Users/suzmue/go/bin
[16:33:27.851 UTC] Current working directory: /Users/suzmue/simpleproj
[16:33:27.852 UTC] Running: /Users/suzmue/go/bin/dlv debug --headless=true --listen=127.0.0.1:15304 --api-version=2
[16:33:28.260 UTC] To client: {"seq":0,"type":"event","event":"output","body":{"category":"stdout","output":"API server listening at: 127.0.0.1:15304\n"}}
[16:33:28.465 UTC] To client: {"seq":0,"type":"event","event":"initialized"}
[16:33:28.466 UTC] InitializeEvent
[16:33:28.466 UTC] To client: {"seq":0,"type":"response","request_seq":2,"command":"launch","success":true}
[16:33:28.468 UTC] From client: setBreakpoints({"source":{"name":"main.go","path":"/Users/suzmue/simpleproj/main.go","sourceReference":0},"lines":[9],"breakpoints":[{"line":9}],"sourceModified":false})
[16:33:28.468 UTC] SetBreakPointsRequest
[16:33:28.470 UTC] Debuggee is not running. Setting breakpoints without halting.
[16:33:28.471 UTC] All cleared
[16:33:28.471 UTC] Creating on: /Users/suzmue/simpleproj/main.go:9
[16:33:28.473 UTC] All set:[{"Breakpoint":{"id":1,"name":"","addr":17633793,"addrs":[17633793],"file":"/Users/suzmue/simpleproj/main.go","line":9,"functionName":"main.main","Cond":"","continue":false,"traceReturn":false,"goroutine":false,"stacktrace":0,"LoadArgs":{"FollowPointers":true,"MaxVariableRecurse":1,"MaxStringLen":64,"MaxArrayValues":64,"MaxStructFields":-1},"LoadLocals":{"FollowPointers":true,"MaxVariableRecurse":1,"MaxStringLen":64,"MaxArrayValues":64,"MaxStructFields":-1},"hitCount":{},"totalHitCount":0}}]
[16:33:28.473 UTC] To client: {"seq":0,"type":"response","request_seq":3,"command":"setBreakpoints","success":true,"body":{"breakpoints":[{"verified":true,"line":9}]}}
[16:33:28.473 UTC] SetBreakPointsResponse
[16:33:28.485 UTC] From client: configurationDone(undefined)
[16:33:28.485 UTC] ConfigurationDoneRequest
[16:33:28.486 UTC] Changing DebugState from Halted to Running
[16:33:28.487 UTC] To client: {"seq":0,"type":"response","request_seq":4,"command":"configurationDone","success":true}
[16:33:28.487 UTC] ConfigurationDoneResponse {"seq":36,"type":"response","request_seq":4,"command":"configurationDone","success":true}
[16:33:28.490 UTC] From client: threads(undefined)
[16:33:28.491 UTC] To client: {"seq":0,"type":"response","request_seq":5,"command":"threads","success":true,"body":{"threads":[{"id":1,"name":"Dummy"}]}}
[16:33:28.504 UTC] continue state {"Running":false,"Recording":false,"currentThread":{"id":607959,"pc":17633793,"file":"/Users/suzmue/simpleproj/main.go","line":9,"function":{"name":"main.main","value":17633760,"type":0,"goType":0,"optimized":false},"goroutineID":1,"breakPoint":{"id":1,"name":"","addr":17633793,"addrs":[17633793],"file":"/Users/suzmue/simpleproj/main.go","line":9,"functionName":"main.main","Cond":"","continue":false,"traceReturn":false,"goroutine":false,"stacktrace":0,"LoadArgs":{"FollowPointers":true,"MaxVariableRecurse":1,"MaxStringLen":64,"MaxArrayValues":64,"MaxStructFields":-1},"LoadLocals":{"FollowPointers":true,"MaxVariableRecurse":1,"MaxStringLen":64,"MaxArrayValues":64,"MaxStructFields":-1},"hitCount":{"1":1},"totalHitCount":1},"breakPointInfo":{},"ReturnValues":null},"currentGoroutine":{"id":1,"currentLoc":{"pc":17633793,"file":"/Users/suzmue/simpleproj/main.go","line":9,"function":{"name":"main.main","value":17633760,"type":0,"goType":0,"optimized":false}},"userCurrentLoc":{"pc":17633793,"file":"/Users/suzmue/simpleproj/main.go","line":9,"function":{"name":"main.main","value":17633760,"type":0,"goType":0,"optimized":false}},"goStatementLoc":{"pc":17216790,"file":"/usr/local/go/src/runtime/asm_amd64.s","line":220,"function":{"name":"runtime.rt0_go","value":17216480,"type":0,"goType":0,"optimized":true}},"startLoc":{"pc":17017088,"file":"/usr/local/go/src/runtime/proc.go","line":114,"function":{"name":"runtime.main","value":17017088,"type":0,"goType":0,"optimized":true}},"threadID":607959,"unreadable":""},"Threads":[{"id":608014,"pc":140735047706754,"file":"","line":0,"goroutineID":0,"ReturnValues":null},{"id":607959,"pc":17633793,"file":"/Users/suzmue/simpleproj/main.go","line":9,"function":{"name":"main.main","value":17633760,"type":0,"goType":0,"optimized":false},"goroutineID":1,"breakPoint":{"id":1,"name":"","addr":17633793,"addrs":[17633793],"file":"/Users/suzmue/simpleproj/main.go","line":9,"functionName":"main.main","Cond":"","continue":false,"traceReturn":false,"goroutine":false,"stacktrace":0,"LoadArgs":{"FollowPointers":true,"MaxVariableRecurse":1,"MaxStringLen":64,"MaxArrayValues":64,"MaxStructFields":-1},"LoadLocals":{"FollowPointers":true,"MaxVariableRecurse":1,"MaxStringLen":64,"MaxArrayValues":64,"MaxStructFields":-1},"hitCount":{"1":1},"totalHitCount":1},"breakPointInfo":{},"ReturnValues":null},{"id":608011,"pc":140735047706454,"file":"","line":0,"goroutineID":0,"ReturnValues":null},{"id":608012,"pc":140735047706754,"file":"","line":0,"goroutineID":0,"ReturnValues":null},{"id":608013,"pc":140735047706754,"file":"","line":0,"goroutineID":0,"ReturnValues":null}],"NextInProgress":false,"exited":false,"exitStatus":0,"When":""}
[16:33:28.504 UTC] handleReenterDebug(breakpoint).
[16:33:28.506 UTC] To client: {"seq":0,"type":"event","event":"stopped","body":{"reason":"breakpoint","threadId":1,"allThreadsStopped":true}}
[16:33:28.507 UTC] StoppedEvent("breakpoint")
[16:33:28.508 UTC] From client: threads(undefined)
[16:33:28.509 UTC] ThreadsRequest
[16:33:28.521 UTC] goroutines [{"id":1,"currentLoc":{"pc":17633793,"file":"/Users/suzmue/simpleproj/main.go","line":9,"function":{"name":"main.main","value":17633760,"type":0,"goType":0,"optimized":false}},"userCurrentLoc":{"pc":17633793,"file":"/Users/suzmue/simpleproj/main.go","line":9,"function":{"name":"main.main","value":17633760,"type":0,"goType":0,"optimized":false}},"goStatementLoc":{"pc":17216790,"file":"/usr/local/go/src/runtime/asm_amd64.s","line":220,"function":{"name":"runtime.rt0_go","value":17216480,"type":0,"goType":0,"optimized":true}},"startLoc":{"pc":17017088,"file":"/usr/local/go/src/runtime/proc.go","line":114,"function":{"name":"runtime.main","value":17017088,"type":0,"goType":0,"optimized":true}},"threadID":607959,"unreadable":""},{"id":2,"currentLoc":{"pc":17018613,"file":"/usr/local/go/src/runtime/proc.go","line":307,"function":{"name":"runtime.gopark","value":17018400,"type":0,"goType":0,"optimized":true}},"userCurrentLoc":{"pc":17018613,"file":"/usr/local/go/src/runtime/proc.go","line":307,"function":{"name":"runtime.gopark","value":17018400,"type":0,"goType":0,"optimized":true}},"goStatementLoc":{"pc":17017973,"file":"/usr/local/go/src/runtime/proc.go","line":243,"function":{"name":"runtime.init.6","value":17017920,"type":0,"goType":0,"optimized":true}},"startLoc":{"pc":17018016,"file":"/usr/local/go/src/runtime/proc.go","line":246,"function":{"name":"runtime.forcegchelper","value":17018016,"type":0,"goType":0,"optimized":true}},"threadID":0,"unreadable":""},{"id":3,"currentLoc":{"pc":17018613,"file":"/usr/local/go/src/runtime/proc.go","line":307,"function":{"name":"runtime.gopark","value":17018400,"type":0,"goType":0,"optimized":true}},"userCurrentLoc":{"pc":17018613,"file":"/usr/local/go/src/runtime/proc.go","line":307,"function":{"name":"runtime.gopark","value":17018400,"type":0,"goType":0,"optimized":true}},"goStatementLoc":{"pc":16889596,"file":"/usr/local/go/src/runtime/mgc.go","line":217,"function":{"name":"runtime.gcenable","value":16889504,"type":0,"goType":0,"optimized":true}},"startLoc":{"pc":16930176,"file":"/usr/local/go/src/runtime/mgcsweep.go","line":156,"function":{"name":"runtime.bgsweep","value":16930176,"type":0,"goType":0,"optimized":true}},"threadID":0,"unreadable":""},{"id":4,"currentLoc":{"pc":17018613,"file":"/usr/local/go/src/runtime/proc.go","line":307,"function":{"name":"runtime.gopark","value":17018400,"type":0,"goType":0,"optimized":true}},"userCurrentLoc":{"pc":17018613,"file":"/usr/local/go/src/runtime/proc.go","line":307,"function":{"name":"runtime.gopark","value":17018400,"type":0,"goType":0,"optimized":true}},"goStatementLoc":{"pc":16889630,"file":"/usr/local/go/src/runtime/mgc.go","line":218,"function":{"name":"runtime.gcenable","value":16889504,"type":0,"goType":0,"optimized":true}},"startLoc":{"pc":16921600,"file":"/usr/local/go/src/runtime/mgcscavenge.go","line":252,"function":{"name":"runtime.bgscavenge","value":16921600,"type":0,"goType":0,"optimized":true}},"threadID":0,"unreadable":""},{"id":5,"currentLoc":{"pc":17018613,"file":"/usr/local/go/src/runtime/proc.go","line":307,"function":{"name":"runtime.gopark","value":17018400,"type":0,"goType":0,"optimized":true}},"userCurrentLoc":{"pc":17018613,"file":"/usr/local/go/src/runtime/proc.go","line":307,"function":{"name":"runtime.gopark","value":17018400,"type":0,"goType":0,"optimized":true}},"goStatementLoc":{"pc":16885157,"file":"/usr/local/go/src/runtime/mfinal.go","line":156,"function":{"name":"runtime.createfing","value":16885056,"type":0,"goType":0,"optimized":true}},"startLoc":{"pc":16885184,"file":"/usr/local/go/src/runtime/mfinal.go","line":161,"function":{"name":"runtime.runfinq","value":16885184,"type":0,"goType":0,"optimized":true}},"threadID":0,"unreadable":""}]
[16:33:28.522 UTC] To client: {"seq":0,"type":"response","request_seq":6,"command":"threads","success":true,"body":{"threads":[{"id":1,"name":"main.main"},{"id":2,"name":"runtime.gopark"},{"id":3,"name":"runtime.gopark"},{"id":4,"name":"runtime.gopark"},{"id":5,"name":"runtime.gopark"}]}}
[16:33:28.522 UTC] ThreadsResponse [{"id":1,"name":"main.main"},{"id":2,"name":"runtime.gopark"},{"id":3,"name":"runtime.gopark"},{"id":4,"name":"runtime.gopark"},{"id":5,"name":"runtime.gopark"}]
[16:33:28.525 UTC] From client: stackTrace({"threadId":1,"startFrame":0,"levels":20})
[16:33:28.525 UTC] StackTraceRequest
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[16:33:33.621 UTC] SetBreakPointsResponse
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[16:33:33.628 UTC] StackTraceRequest
[16:33:33.629 UTC] To client: {"seq":0,"type":"response","request_seq":13,"command":"stackTrace","success":false,"message":"Unable to produce stack trace as the debugger is running","body":{"error":{"id":2004,"format":"Unable to produce stack trace as the debugger is running","showUser":true}}}
[16:33:33.678 UTC] From client: stackTrace({"threadId":1,"startFrame":0,"levels":20})
[16:33:33.678 UTC] StackTraceRequest
[16:33:33.679 UTC] To client: {"seq":0,"type":"response","request_seq":14,"command":"stackTrace","success":false,"message":"Unable to produce stack trace as the debugger is running","body":{"error":{"id":2004,"format":"Unable to produce stack trace as the debugger is running","showUser":true}}}
[16:33:41.807 UTC] To client: {"seq":0,"type":"event","event":"output","body":{"category":"stdout","output":"bye\r\n"}}
[16:33:41.808 UTC] continue state {"Running":false,"Recording":false,"Threads":null,"NextInProgress":false,"exited":true,"exitStatus":0,"When":""}
[16:33:41.809 UTC] handleReenterDebug().
[16:33:41.809 UTC] To client: {"seq":0,"type":"event","event":"terminated"}
[16:33:41.810 UTC] TerminatedEvent
[16:33:42.113 UTC] From client: disconnect({"restart":false})
[16:33:42.114 UTC] DisconnectRequest
[16:33:42.114 UTC] Closing Delve.
[16:33:42.115 UTC] HaltRequest
[16:33:42.116 UTC] HaltResponse
[16:33:42.117 UTC] Failed to halt - Process 63733 has exited with status 0
[16:33:42.117 UTC] DetachRequest
[16:33:42.118 UTC] DisconnectRequest to parent to shut down protocol server.
[16:33:42.118 UTC] To client: {"seq":0,"type":"response","request_seq":15,"command":"disconnect","success":true}
[16:33:42.119 UTC] DisconnectResponse
[16:33:42.121 UTC] [Error] Process exiting with code: 0
[16:33:42.122 UTC] Sending TerminatedEvent as delve is closed
[16:33:42.122 UTC] To client: {"seq":0,"type":"event","event":"terminated"}
[16:33:47.119 UTC] DisconnectRequestHelper timed out after 5s.

This issue is caused for two reasons:

1. The stopped event isn't skipped even though the next request was running
2. Even if the stopped event was successfully skipped, the program would not halt on the correct line. Continue is called after the next request returns. Continue does not result in the program stopping on the correct line.

[polinasok]

Looks like our first problem is this.skipStopEventOnce = this.continueRequestRunning. We only keep track if continue is running, not if next is running even though to issue the halt we rely on either running by checking debuggee state explicitly and not just the flag we set in continue(). We should keep track of either operation in progress since our actions to recover might be different.

Our second issue is that delve doesn't seem to know it was in the middle of next when we issued a halt (NextInProgress is false), so continue after that is just a regular continue, not a finish-next continue. In that case, we can follow @aarzilli
second suggestion and cancel next while issuing a stopped event. If we ever figure out how to get text/description to work, we can add the details that next was interrupted there, but without that functionality we can hack reason to be "paused on pause, next cancelled" and/or print an error message to Debug Console.

[polinasok]

@aarzilli, is it normal that when next (that sleeps) is interrupted by halt, NextInProgress is not set to true nor returns an error? I think this can be more or less reproduced with Ctrl-C with dlv cli:

(dlv) next
2020-10-20T11:18:04-07:00 debug layer=rpc (async 11) <- RPCServer.Command(api.DebuggerCommand{"name":"next","ReturnInfoLoadConfig":{"FollowPointers":true,"MaxVariableRecurse":1,"MaxStringLen":64,"MaxArrayValues":64,"MaxStructFields":-1}})
2020-10-20T11:18:04-07:00 debug layer=debugger nexting
======> NOTE: Ctrl-C
2020-10-20T11:18:08-07:00 debug layer=rpc (async 12) <- RPCServer.State(rpc2.StateIn{"NonBlocking":true})
======> NOTE: NextInProgress=false
2020-10-20T11:18:08-07:00 debug layer=rpc (async 12) -> rpc2.StateOut{"State":{"Running":true,"Recording":false,"Threads":null,"NextInProgress":false,"exited":false,"exitStatus":0,"When":""}} error: ""
received SIGINT, stopping process (will not forward signal)
2020-10-20T11:18:08-07:00 debug layer=rpc (async 13) <- RPCServer.Command(api.DebuggerCommand{"name":"halt","ReturnInfoLoadConfig":null})
2020-10-20T11:18:08-07:00 debug layer=debugger halting
======> NOTE: NextInProgress=false
2020-10-20T11:18:08-07:00 debug layer=rpc (async 11) -> rpc2.CommandOut{"State":{"Running":false,"Recording":false,"currentThread":{"id":3928371,"pc":140735118235494,"file":"","line":0,"goroutineID":0,"ReturnValues":null},"Threads":[{"id":3928746,"pc":140735118227586,"file":"","line":0,"goroutineID":0,"ReturnValues":null},{"id":3928371,"pc":140735118235494,"file":"","line":0,"goroutineID":0,"ReturnValues":null},{"id":3928743,"pc":140735118227586,"file":"","line":0,"goroutineID":0,"ReturnValues":null},{"id":3928744,"pc":140735118227586,"file":"","line":0,"goroutineID":0,"ReturnValues":null},{"id":3928745,"pc":140735118227586,"file":"","line":0,"goroutineID":0,"ReturnValues":null}],"NextInProgress":false,"exited":false,"exitStatus":0,"When":""}} error: ""
======> NOTE: NextInProgress=false
2020-10-20T11:18:08-07:00 debug layer=rpc (async 13) -> rpc2.CommandOut{"State":{"Running":false,"Recording":false,"currentThread":{"id":3928371,"pc":140735118235494,"file":"","line":0,"goroutineID":0,"ReturnValues":null},"Threads":[{"id":3928371,"pc":140735118235494,"file":"","line":0,"goroutineID":0,"ReturnValues":null},{"id":3928743,"pc":140735118227586,"file":"","line":0,"goroutineID":0,"ReturnValues":null},{"id":3928744,"pc":140735118227586,"file":"","line":0,"goroutineID":0,"ReturnValues":null},{"id":3928745,"pc":140735118227586,"file":"","line":0,"goroutineID":0,"ReturnValues":null},{"id":3928746,"pc":140735118227586,"file":"","line":0,"goroutineID":0,"ReturnValues":null}],"NextInProgress":false,"exited":false,"exitStatus":0,"When":""}} error: ""
Stopped at: 0x7fff72bad766
=>no source available
(dlv) 

[aarzilli]

is it normal that when next (that sleeps) is interrupted by halt, NextInProgress is not set to true nor returns an error?

Halt was changed to automatically cancel any next operation in progress in march 2018 commit go-delve/delve@449b3ce to fix issue go-delve/delve#1145.

[polinasok]

Ah, thank you for clarification.

@suzmue In that case, we can leave skipStopEventOnce the way it is, tracking if continue is in progress, and generate StoppedEvent('step') as we do now, but then instead of continuing in setBreakPointscallback, we can use an OutputEvent to print an error message to the debug console and also document this in our user docs. What do you think?

[gopherbot]

Change https://golang.org/cl/261078 mentions this issue: src/debugAdapter: cancel next when set breakpoints is called

[gopherbot]

Change https://golang.org/cl/279416 mentions this issue: src/debugAdapter: report that next is automatically cancelled if interrupted

[hyangah]

@suzmue @polinasok do you want to track changes for DelveDAP in a separate issue?
Or should we now move this to the DelveDAP project tracker?

[polinasok]

This entire feature (setting breakpoints while the program is running whether on continue or step) is not yet implemented in the new adapter, so it might not make sense to file a separate issue for a bug in a feature that doesn't yet exist. When we work on the implementation, we will base it on the existing code and unittests and avoid the bug all-together.

This brings us to a more general question of how to track not-yet-implemented features. Should we be filing issues for each one? In this repo or in the delve repo? Whether or not we file the issues, it would be ideal to have a set of vscode-go unittests corresponding to the features we want to support and then we can test the new adapter against that and know exactly what is missing.