Line Numbers missing in Exceptions

[goswinr]

When using F# Interactive via FSharp.Compiler.Service 41.0.4 on net48 Exceptions do not include line numbers.
Line numbers are only shown on net6.0 :

Is there a way to make exceptions include line numbers when on net48 ?
I am hosting fsi in a much larger net48 process. So I can't switch to net6.0.

code used:

let code = """
try
    8 / 0 |> ignore
with e -> 
    printfn $"Runtime: {System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription}"
    printfn $"Error: {e}" 
"""

open System
open System.IO
open FSharp.Compiler.Interactive.Shell

let eval(codeStr) = 
    let inn = new StringReader("")
    let out = Console.Out
    let config = FsiEvaluationSession.GetDefaultConfiguration()
    let noArgs = [| "the first arg is neded, but ignored"|]
    let session = FsiEvaluationSession.Create(config, noArgs, inn, out, out)
    session.EvalInteraction(codeStr)

eval(code)
    
System.Console.ReadLine() |> ignore

and

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFrameworks>net48;net6.0</TargetFrameworks>
  </PropertyGroup>

  <ItemGroup>
    <Compile Include="Program.fs" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Update="FSharp.Core" Version="6.0.4" />
    <PackageReference Include="FSharp.Compiler.Service" Version="41.0.4" />
  </ItemGroup>
</Project>

full repo: https://github.com/goswinr/ErrorLineNumberMissing

[dsyme]

You might try passing --debug in the arguments to the interactive session

[dsyme]

You might also try --multiemit

[goswinr]

thanks @dsyme --multiemit fixed it !

The documentation here is also great: https://fsharp.github.io/fsharp-compiler-docs/fsi-emit.html

[dsyme]

I'll convert this to a discussion since I don't think we'd treat this as a specific bug yet based on the info above

[goswinr]

@dsyme I still have the problem when hosting a fsi session in a net48 process.
I tried changing the current directory like in this other hosting problem but it didn't help.
The path to input.fsx and the line number don't show.
(In standalone line numbers show with --multiemit)

Do you have any suggestions? Or can you suggest places to start looking for the issues in the source?

[dsyme]

Hmmm I'm not really sure what to look at next. Could you link your latest attempt?