Cannot go to symbol definition in VS

[kostya9]

I am coming from C# background and started playing with F# web apps.

I have a small Program.fs file I created from the Giraffe Get Started page. I want to see the source code for the route function (L9 Program.fs), but when I click "Go to definition" in Visual Studio I see "Cannot navigate to the symbol under the caret.". I found an issue giraffe-fsharp/Giraffe#426 that says that Giraffe is probably packaged correctly, so I decided to ask here. Is this expected behaviour, an fsharp bug or something is wrong with the Giraffe package?

Program.fs

open Microsoft.AspNetCore.Hosting
open Microsoft.AspNetCore.Builder
open Giraffe
open Microsoft.Extensions.Hosting
open Microsoft.Extensions.DependencyInjection
open Microsoft.Extensions.Logging

let webApp =
    choose [ route "/ping" >=> text "pong" // I try to go to definition here on the route function
             route "/" >=> htmlFile "/pages/index.html" ]

type Startup() =
    member __.ConfigureServices(services: IServiceCollection) =
        // Register default Giraffe dependencies
        services.AddGiraffe() |> ignore

    member __.Configure (app: IApplicationBuilder) (env: IHostEnvironment) (loggerFactory: ILoggerFactory) =
        // Add Giraffe to the ASP.NET Core pipeline
        app.UseGiraffe webApp


[<EntryPoint>]
let main argv =

    Host
        .CreateDefaultBuilder()
        .ConfigureWebHostDefaults(fun webHostBuilder -> webHostBuilder.UseStartup<Startup>() |> ignore)
        .Build()
        .Run()

    0

.fsproj file

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>

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

  <ItemGroup>
    <PackageReference Include="Giraffe" Version="4.1.0" />
  </ItemGroup>

</Project>

[cartermp]

There's a version of this coming in the VS 16.10 update, but only for non-F# constructs. It will enable a decompiled view. For example, this is from IHostEnvironment:

But as mentioned, this doesn't work yet for an F# project yet.

[kostya9]

Thanks! If there is already an issue for this that I can upvote, please let me know.

If somebody else finds this, the feature works in VS Code + Ionide, which is pretty nice.

[vzarytovskii]

I don't think we're tracking this anywhere on GH, @TIHan @cartermp correct me if I'm wrong.

[cartermp]

The enhancements are tracked here:

#11278
#11279
#11280