Intermittent 'Server Prompt' output from FSI

[MaxWilsonMS]

Description

About 1 time in 20, FSI appends the string "SERVER-PROMPT>" to the output for unclear reasons.

Version: Microsoft (R) F# Interactive version 12.5.0.0 for F# 7.0 from inside Visual Studio 2022 17.5.0 Preview 4.

Repro steps

1. Define a debug function

type MonsterId = MonsterId of string
let debug () =
    let monsters = [[MonsterId "Vampire"]]
    monsters, "The town priest turns out to be a vampire"
debug()

2. Run the debug() line a bunch of times via Send To Interactive.

EXPECTED: It will always print

    val it: MonsterId list list * string =
    ([[MonsterId "Vampire"]], "The town priest turns out to be a vampire")

ACTUAL: Sometimes it will print

    val it: MonsterId list list * string =
    ([[MonsterId "Vampire"]], "The town priest turns out to be a vampire")

    SERVER-PROMPT>

Known workarounds

Just ignore the issue? I'm not sure what the actual impact is beyond increasing friction during exploratory programming.

Provide any related information (optional):

The specific text seems to be important. I have not been able to reliably repro this issue without including the word "vampire" in the output.

• Version: Microsoft (R) F# Interactive version 12.5.0.0 for F# 7.0 from inside Visual Studio

• Operating system Windows

[MaxWilsonMS]

I did get it to repro once with

val it: string * MonsterId list list =
  ("Goblin wolf riders attack the town",
   [[MonsterId "Goblin"; MonsterId "Goblin"; MonsterId "Goblin";
     MonsterId "Goblin"];
    [MonsterId "Wolf"; MonsterId "Wolf"; MonsterId "Wolf"]])

SERVER-PROMPT>

[vzarytovskii]

@KevinRansom i believe it was fixed, right? Caused by desync between VS and inserted SDK?

[MaxWilsonMS]

@vzarytovskii, I tried again in Preview 6, and the issue still happens although it manifests differently. Instead of "SERVER-PROMPT>" I see output like this:

> 

  #silentCd @"C:\code\POCDungeonDraw\src";;
  ^^^^^^^^^^^^^^^^^^^^^^^^^

stdin(4,1): warning FS3353: Invalid directive '#interactiveprompt hide'

val it: MonsterId list list * string =
  ([[MonsterId "Vampire"]], "The town priest turns out to be a vampire")

> 
  System.IO.File.WriteAllText(@"C:\Users\maxw\AppData\Local\Temp\tmpDE64.tmp.pid", string (System.Diagnostics.Process.GetCurrentProcess().Id));;
  ^^^^^^^^^^^^^^^^^^^^^^^^^

stdin(1,1): warning FS3353: Invalid directive '#interactiveprompt show'

Because it is intermittent I believe it is still the same issue somehow, but I could be wrong. Let me know if I should open a new issue.

[MaxWilsonMS]

I guess the new unexplained warning is not that intermittent, I just didn't have my window open big enough to see it. I will close this issue as fixed and open a new one.