Fix Editor

Author: auduchinok

vsintegration/src/FSharp.Editor/Navigation/GoToDefinition.fs

@@ -204,8 +204,12 @@ type internal GoToDefinition(metadataAsSource: FSharpMetadataAsSourceService) =
             match targetSymbolUse.Symbol with
             | :? FSharpEntity as symbol -> symbol.TryGetMetadataText() |> Option.map (fun text -> text, symbol.DisplayName)
             | :? FSharpMemberOrFunctionOrValue as symbol ->
-                symbol.ApparentEnclosingEntity.TryGetMetadataText()
-                |> Option.map (fun text -> text, symbol.ApparentEnclosingEntity.DisplayName)
+                symbol.ApparentEnclosingEntity
+                |> Option.bind (fun entity ->
+                    entity.TryGetMetadataText()
+                    |> Option.map (fun text -> text, entity.DisplayName)
+                )
+
             | :? FSharpField as symbol ->
                 match symbol.DeclaringEntity with
                 | Some entity ->
@@ -652,8 +656,11 @@ type internal GoToDefinition(metadataAsSource: FSharpMetadataAsSourceService) =
             match targetSymbolUse.Symbol with
             | :? FSharpEntity as symbol -> symbol.TryGetMetadataText() |> Option.map (fun text -> text, symbol.DisplayName)
             | :? FSharpMemberOrFunctionOrValue as symbol ->
-                symbol.ApparentEnclosingEntity.TryGetMetadataText()
-                |> Option.map (fun text -> text, symbol.ApparentEnclosingEntity.DisplayName)
+                symbol.ApparentEnclosingEntity
+                |> Option.bind (fun entity ->
+                    entity.TryGetMetadataText()
+                    |> Option.map (fun text -> text, entity.DisplayName)
+                )
             | :? FSharpField as symbol ->
                 match symbol.DeclaringEntity with
                 | Some entity ->