Remove FromX methods from ValueTask

Author: gusty

src/FSharpPlus/Control/Monad.fs

@@ -145,7 +145,7 @@ type Return =
     static member        Return (_: 'T Task        , _: Return  ) = fun x -> Task.FromResult x                    : 'T Task
     #endif
     #if NETSTANDARD2_1 && !FABLE_COMPILER
-    static member        Return (_: 'T ValueTask   , _: Return  ) = fun x -> ValueTask.FromResult x               : 'T ValueTask
+    static member        Return (_: 'T ValueTask   , _: Return  ) = fun (x: 'T) -> ValueTask<'T> x                : 'T ValueTask
     #endif
     static member        Return (_: option<'a>     , _: Return  ) = fun x -> Some x                               : option<'a>
     static member        Return (_  : voption<'a>  , _: Return  ) = fun x -> ValueSome x                          : voption<'a>

src/FSharpPlus/Extensions/ValueTask.fs

@@ -5,37 +5,14 @@ namespace FSharpPlus
 /// Additional operations on ValueTask<'T>
 [<RequireQualifiedAccess>]
 module ValueTask =
-    
-    open System.Threading
+
     open System.Threading.Tasks
 
     let inline internal (|Succeeded|Canceled|Faulted|) (t: ValueTask<'T>) =
         if t.IsCompletedSuccessfully then Succeeded t.Result
         elif t.IsCanceled then Canceled
-        else Faulted (t.AsTask().Exception.InnerExceptions)
-    
-    /// <summary>Creates a <see cref="ValueTask{TResult}"/> that's completed successfully with the specified result.</summary>
-    /// <typeparam name="TResult">The type of the result returned by the task.</typeparam>
-    /// <param name="result">The result to store into the completed task.</param>
-    /// <returns>The successfully completed task.</returns>
-    let FromResult<'TResult> (result: 'TResult) = ValueTask<'TResult> result
-       
-    /// <summary>Creates a <see cref="ValueTask{TResult}"/> that's completed exceptionally with the specified exception.</summary>
-    /// <typeparam name="TResult">The type of the result returned by the task.</typeparam>
-    /// <param name="exception">The exception with which to complete the task.</param>
-    /// <returns>The faulted task.</returns>
-    let FromException<'TResult> (``exception``: exn) = ValueTask<'TResult> (Task.FromException<'TResult> ``exception``)
+        else Faulted (t.AsTask().Exception.InnerExceptions)    
 
-    /// <summary>Creates a <see cref="ValueTask{TResult}"/> that's completed due to cancellation with the specified token.</summary>
-    /// <typeparam name="TResult">The type of the result returned by the task.</typeparam>
-    /// <param name="cancellationToken">The token with which to complete the task.</param>
-    /// <returns>The canceled task.</returns>
-    let FromCanceled<'TResult> (cancellationToken: CancellationToken) = ValueTask<'TResult> (Task.FromCanceled<'TResult> cancellationToken)
-    
-    /// <summary>Creates a <see cref="ValueTask{TResult}"/> from a <see cref="Task{TResult}"/>.</summary>
-    /// <param name="source">Task workflow.</param>
-    let FromTask<'TResult> (source: Task<'TResult>) = ValueTask<'TResult> source
-
     let inline internal continueTask (tcs: TaskCompletionSource<'Result>) (x: ValueTask<'t>) (k: 't -> unit) =
         let f = function
         | Succeeded r -> k r
@@ -47,6 +24,8 @@ module ValueTask =
             aw.OnCompleted (fun () -> f x)
 
     /// <summary>Creates a ValueTask workflow from 'source' another, mapping its result with 'f'.</summary>
+    /// <param name="f">The mapping function.</param>
+    /// <param name="source">ValueTask workflow.</param>
     let map (f: 'T -> 'U) (source: ValueTask<'T>) : ValueTask<'U> =
         let tcs = TaskCompletionSource<'U> ()
         continueTask tcs source (fun x ->
@@ -133,6 +112,6 @@ module ValueTask =
 
 
     /// Raises an exception in the ValueTask
-    let raise (e: exn) = FromException e
+    let raise (``exception``: exn) = ValueTask<'TResult> (Task.FromException<'TResult> ``exception``)
 
 #endif

tests/FSharpPlus.Tests/ValueTask.fs

@@ -12,12 +12,36 @@ module ValueTask =
 
     exception TestException of string
 
+
+    module ValueTask =
+        open System.Threading
+
+        // Following is not available in F#6
+
+        /// <summary>Creates a <see cref="ValueTask{TResult}"/> that's completed successfully with the specified result.</summary>
+        /// <typeparam name="TResult">The type of the result returned by the task.</typeparam>
+        /// <param name="result">The result to store into the completed task.</param>
+        /// <returns>The successfully completed task.</returns>
+        let FromResult<'TResult> (result: 'TResult) = ValueTask<'TResult> result
+
+        /// <summary>Creates a <see cref="ValueTask{TResult}"/> that's completed exceptionally with the specified exception.</summary>
+        /// <typeparam name="TResult">The type of the result returned by the task.</typeparam>
+        /// <param name="exception">The exception with which to complete the task.</param>
+        /// <returns>The faulted task.</returns>
+        let FromException<'TResult> (``exception``: exn) = ValueTask<'TResult> (Task.FromException<'TResult> ``exception``)
+
+        /// <summary>Creates a <see cref="ValueTask{TResult}"/> that's completed due to cancellation with the specified token.</summary>
+        /// <typeparam name="TResult">The type of the result returned by the task.</typeparam>
+        /// <param name="cancellationToken">The token with which to complete the task.</param>
+        /// <returns>The canceled task.</returns>
+        let FromCanceled<'TResult> (cancellationToken: CancellationToken) = ValueTask<'TResult> (Task.FromCanceled<'TResult> cancellationToken)
+
     module ValueTaskTests =
 
         let createValueTask isFailed value =
-            if not isFailed then ValueTask.FromResult value
+            if not isFailed then ValueTask.FromResult<_> value
             else
-                ValueTask.FromException (TestException (sprintf "Ouch, can't create: %A" value ))
+                ValueTask.FromException<_> (TestException (sprintf "Ouch, can't create: %A" value ))
 
         let (|AggregateException|_|) (x: exn) =
             match x with