diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index ed82e866e0..52aac9ef1c 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
-  <Source Uri="https://github.com/dotnet/dotnet" Mapping="fsharp" Sha="64d877a07af8c020fe9da6e721bc2258894f31ee" BarId="286279" />
+  <Source Uri="https://github.com/dotnet/dotnet" Mapping="fsharp" Sha="01abb3ec5c4cbffec5b33e02156bd3d2a8913b04" BarId="286825" />
   <ProductDependencies>
     <Dependency Name="Microsoft.Build" Version="18.1.0-preview-25511-01">
       <Uri>https://github.com/dotnet/msbuild</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index 959c6e0803..9a996ef009 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -99,15 +99,10 @@
     <VisualStudioShellProjectsPackages>18.0.2077-preview.1</VisualStudioShellProjectsPackages>
     <MicrosoftVisualStudioThreadingPackagesVersion>18.0.5</MicrosoftVisualStudioThreadingPackagesVersion>
   
-    <!-- Roslyn packages -->
-    <MicrosoftCodeAnalysisEditorFeaturesTextVersion>5.0.0-2.25480.7</MicrosoftCodeAnalysisEditorFeaturesTextVersion>
-    <MicrosoftCodeAnalysisExternalAccessFSharpVersion>5.0.0-2.25480.7</MicrosoftCodeAnalysisExternalAccessFSharpVersion>
-    <MicrosoftCodeAnalysisVersion>5.0.0-2.25480.7</MicrosoftCodeAnalysisVersion>
-    <MicrosoftCodeAnalysisCSharpVersion>5.0.0-2.25480.7</MicrosoftCodeAnalysisCSharpVersion>
-    <MicrosoftVisualStudioLanguageServicesVersion>5.0.0-2.25480.7</MicrosoftVisualStudioLanguageServicesVersion>
+    <!-- Roslyn packages. Rest is managed by maestro bot and is in the imported .Details.props file -->
     <MicrosoftCodeAnalysisTestResourcesProprietaryVersion>2.0.28</MicrosoftCodeAnalysisTestResourcesProprietaryVersion>
-	<!-- Roslyn for when we need to compile C# in tests. .dll hell caused by vstest makes newer version fail at runtime -->
-	<RoslynForTestingButNotForVSLayer>4.14.0</RoslynForTestingButNotForVSLayer>
+	  <!-- Roslyn for when we need to compile C# in tests. .dll hell caused by vstest makes newer version fail at runtime -->
+	  <RoslynForTestingButNotForVSLayer>4.14.0</RoslynForTestingButNotForVSLayer>
     <!-- -->
     <!-- Visual Studio Shell packages -->
     <MicrosoftVisualStudioInteropVersion>$(MicrosoftVisualStudioShellPackagesVersion)</MicrosoftVisualStudioInteropVersion>
diff --git a/src/Compiler/Service/ServiceAssemblyContent.fs b/src/Compiler/Service/ServiceAssemblyContent.fs
index f1b3bf2ee1..8c58565125 100644
--- a/src/Compiler/Service/ServiceAssemblyContent.fs
+++ b/src/Compiler/Service/ServiceAssemblyContent.fs
@@ -16,7 +16,7 @@ open FSharp.Compiler.Symbols
 open FSharp.Compiler.Syntax
 
 module Utils =
-    let replaceLastIdentToDisplayName idents (displayName: string) =
+    let replaceLastIdentToDisplayName (idents: string array) (displayName: string) =
         match idents |> Array.tryFindIndexBack (fun i -> displayName.StartsWith(i, System.StringComparison.Ordinal)) with
         | Some x when x = idents.Length - 1 -> idents |> Array.replace (idents.Length - 1) displayName
         | Some x -> 
diff --git a/src/Compiler/Utilities/illib.fs b/src/Compiler/Utilities/illib.fs
index aa83558632..e10a84f8ea 100644
--- a/src/Compiler/Utilities/illib.fs
+++ b/src/Compiler/Utilities/illib.fs
@@ -96,22 +96,22 @@ module internal PervasiveAutoOpens =
 
     type String with
 
-        member inline x.StartsWithOrdinal value =
+        member inline x.StartsWithOrdinal(value: string) =
             x.StartsWith(value, StringComparison.Ordinal)
 
-        member inline x.EndsWithOrdinal value =
+        member inline x.EndsWithOrdinal(value: string) =
             x.EndsWith(value, StringComparison.Ordinal)
 
-        member inline x.EndsWithOrdinalIgnoreCase value =
+        member inline x.EndsWithOrdinalIgnoreCase(value: string) =
             x.EndsWith(value, StringComparison.OrdinalIgnoreCase)
 
         member inline x.IndexOfOrdinal(value: string) =
             x.IndexOf(value, StringComparison.Ordinal)
 
-        member inline x.IndexOfOrdinal(value, startIndex) =
+        member inline x.IndexOfOrdinal(value: string, startIndex) =
             x.IndexOf(value, startIndex, StringComparison.Ordinal)
 
-        member inline x.IndexOfOrdinal(value, startIndex, count) =
+        member inline x.IndexOfOrdinal(value: string, startIndex, count) =
             x.IndexOf(value, startIndex, count, StringComparison.Ordinal)
 
     /// Get an initialization hole