update tfms for type providers

Author: dsyme

tests/FSharp.Compiler.UnitTests/ProductVersion.fs

@@ -93,21 +93,21 @@ module TypeProviderDesignTimeComponentLoading =
     let ``check tooling paths for type provider design time component loading`` () =
         let expected =
           [
-#if NET46 // only available on net46
-            Path.Combine("typeproviders", "fsharp41", "net461")
-            Path.Combine("tools", "fsharp41", "net461")
-            Path.Combine("typeproviders", "fsharp41", "net452")
-            Path.Combine("tools", "fsharp41", "net452")
-            Path.Combine("typeproviders", "fsharp41", "net451")
-            Path.Combine("tools", "fsharp41", "net451")
-            Path.Combine("typeproviders", "fsharp41", "net45")
-            Path.Combine("tools", "fsharp41", "net45")
-#else // only available on netcoreapp2.0
-            Path.Combine("typeproviders", "fsharp41", "netcoreapp2.0")
-            Path.Combine("tools", "fsharp41", "netcoreapp2.0")
-#endif // available in both
-            Path.Combine("typeproviders", "fsharp41", "netstandard2.0")
-            Path.Combine("tools", "fsharp41", "netstandard2.0")
+#if NET46 
+            // only searched when executing on .NET Framework
+            for tfm in ["net48"; "net472"; "net471"; "net47"; "net462"; "net461"; "net452"; "net451"; "net45"] do
+                yield Path.Combine("typeproviders", "fsharp41", tfm)
+                yield Path.Combine("tools", "fsharp41", tfm)
+#else 
+            // only searched when executing on .NET Core
+            for tfm in ["netcoreapp2.1"; "netcoreapp2.0"] do
+                yield Path.Combine("typeproviders", "fsharp41", tfm)
+                yield Path.Combine("tools", "fsharp41", tfm)
+#endif 
+            // always searched
+            for tfm in ["netstandard2.0"] do
+                yield Path.Combine("typeproviders", "fsharp41", tfm)
+                yield Path.Combine("tools", "fsharp41", tfm)
           ]
         let actual = FSharp.Compiler.ExtensionTyping.toolingCompatiblePaths()
         printfn "actual = %A" actual