Add a comment and move Activity.fs/fsi to Utilities/

src/Compiler/FSharp.Compiler.Service.fsproj

@@ -93,6 +93,8 @@
       <Link>FSStrings.resx</Link>
       <LogicalName>FSStrings.resources</LogicalName>
     </EmbeddedResource>
+    <Compile Include="Utilities\Activity.fsi" />
+    <Compile Include="Utilities\Activity.fs" />
     <Compile Include="Utilities\sformat.fsi" />
     <Compile Include="Utilities\sformat.fs" />
     <Compile Include="Utilities\sr.fsi" />
@@ -133,8 +135,6 @@
     <Compile Include="Utilities\range.fsi" />
     <Compile Include="Utilities\range.fs" />
     <EmbeddedText Include="Facilities\UtilsStrings.txt" />
-    <Compile Include="Facilities\Activity.fsi" />
-    <Compile Include="Facilities\Activity.fs" />
     <Compile Include="Facilities\LanguageFeatures.fsi" />
     <Compile Include="Facilities\LanguageFeatures.fs" />
     <Compile Include="Facilities\DiagnosticOptions.fsi" />

src/Compiler/Facilities/BuildGraph.fsi

@@ -44,10 +44,10 @@ type NodeCodeBuilder =
 
     member Combine: x1: NodeCode<unit> * x2: NodeCode<'T> -> NodeCode<'T>
 
-    /// A limited form 'use' for establishing the compilation globals.  (Note
-    /// that a proper generic 'use' could be implemented but has not currently been necessary)
+    /// A limited form 'use' for establishing the compilation globals.
     member Using: CompilationGlobalsScope * (CompilationGlobalsScope -> NodeCode<'T>) -> NodeCode<'T>
 
+    /// A generic 'use' that disposes of the IDisposable at the end of the computation.
     member Using: IDisposable * (IDisposable -> NodeCode<'T>) -> NodeCode<'T>
 
 /// Specifies code that can be run as part of the build graph.

src/Compiler/Facilities/Activity.fs → src/Compiler/Utilities/Activity.fs

@@ -4,7 +4,6 @@ namespace FSharp.Compiler.Diagnostics
 
 open System
 open System.Diagnostics
-open Internal.Utilities.Library
 
 [<RequireQualifiedAccess>]
 module Activity =