C# to F# go to definition navigates to metadata, and not the source code

[oleksandr-bilyk]

Every year we have to buy Rider because Rider allows to navigate from C# code to F# method definition.
We had big expectations that VS2022 will support such a basic feature but not.
Our team decided to use F# in solution where we have many C# and F# projects calling each other.
This small feature is very important for future use of F# in our solutions.

[vzarytovskii]

@tmat do you have any insights on how should we approach it?

My guess is that we theoretically can provide either IGoToDefinitionSymbolService , IFindDefinitionService or ISymbolMappingService, which can provide needed info to Roslyn, however it is tied to ISymbol, not sure what is the correct approach here.

[smoothdeveloper]

@oleksandr-bilyk please consider appending your experience in this discussion: dotnet/csharplang#6412 (comment)

it is about "C#-adjacent tooling experience" from C# Language Design Meeting notes discussions.

The reverse navigation works (Go To Definition on C# member from F# code reaches), which I think came at some point in VS 2019.

[tmat]

@CyrusNajmabadi IIRC LSP should be able to handle this, correct?

[vzarytovskii]

dotnet/roslyn#64010 is in, will experiment with it next week