Fix two bugs related to tasks

src/fsharp/CheckDeclarations.fs

@@ -5876,6 +5876,14 @@ let TypeCheckOneImplFile
 
     let extraAttribs = topAttrs.mainMethodAttrs@topAttrs.netModuleAttrs@topAttrs.assemblyAttrs
 
+    // Run any additional checks registered to be run before applying defaults
+    do 
+      for check in cenv.css.GetPostInferenceChecksPreDefaults() do
+        try  
+            check()
+        with e -> 
+            errorRecovery e m
+
     conditionallySuppressErrorReporting (checkForErrors()) (fun () ->
         ApplyDefaults cenv g denvAtEnd m mexpr extraAttribs)
 
@@ -5899,10 +5907,9 @@ let TypeCheckOneImplFile
       conditionallySuppressErrorReporting (checkForErrors()) (fun () ->
         CheckModuleSignature g cenv m denvAtEnd rootSigOpt implFileTypePriorToSig implFileSpecPriorToSig mexpr)
 
-    // Run any additional checks registered for post-type-inference
     do 
       conditionallySuppressErrorReporting (checkForErrors()) (fun () ->
-         for check in cenv.postInferenceChecks do
+         for check in cenv.css.GetPostInferenceChecksFinal() do
             try  
                 check()
             with e -> 

src/fsharp/CheckExpressions.fs

@@ -359,9 +359,6 @@ type TcFileState =
       /// we infer type parameters
       mutable recUses: ValMultiMap<Expr ref * range * bool>
 
-      /// Checks to run after all inference is complete.
-      mutable postInferenceChecks: ResizeArray<unit -> unit>
-
       /// Set to true if this file causes the creation of generated provided types.
       mutable createsGeneratedProvidedTypes: bool
 
@@ -425,7 +422,6 @@ type TcFileState =
         { g = g
           amap = amap
           recUses = ValMultiMap<_>.Empty
-          postInferenceChecks = ResizeArray()
           createsGeneratedProvidedTypes = false
           topCcu = topCcu
           isScript = isScript
@@ -2624,7 +2620,7 @@ let TcValEarlyGeneralizationConsistencyCheck cenv (env: TcEnv) (v: Val, vrec, ti
     match vrec with
     | ValInRecScope isComplete when isComplete && not (isNil tinst) ->
         //printfn "pushing post-inference check for '%s', vty = '%s'" v.DisplayName (DebugPrint.showType vty)
-        cenv.postInferenceChecks.Add (fun () ->
+        cenv.css.PushPostInferenceCheck (preDefaults=false, check=fun () ->
             //printfn "running post-inference check for '%s'" v.DisplayName
             //printfn "tau = '%s'" (DebugPrint.showType tau)
             //printfn "vty = '%s'" (DebugPrint.showType vty)
@@ -9184,7 +9180,7 @@ and TcMethodApplication
             CanonicalizePartialInferenceProblem cenv.css denv mItem
                  (unnamedCurriedCallerArgs |> List.collectSquared (fun callerArg -> freeInTypeLeftToRight cenv.g false callerArg.CallerArgumentType))
 
-        let result, errors = ResolveOverloadingForCall denv cenv.css mMethExpr methodName 0 None callerArgs ad postArgumentTypeCheckingCalledMethGroup true (Some returnTy)
+        let result, errors = ResolveOverloadingForCall denv cenv.css mMethExpr methodName callerArgs ad postArgumentTypeCheckingCalledMethGroup true returnTy
 
         match afterResolution, result with
         | AfterResolution.DoNothing, _ -> ()

src/fsharp/CheckExpressions.fsi

@@ -180,9 +180,6 @@ type TcFileState =
       /// we infer type parameters 
       mutable recUses: ValMultiMap<Expr ref * range * bool>
 
-      /// Checks to run after all inference is complete. 
-      mutable postInferenceChecks: ResizeArray<unit -> unit>
-
       /// Set to true if this file causes the creation of generated provided types.
       mutable createsGeneratedProvidedTypes: bool
 

src/fsharp/CompilerDiagnostics.fs

@@ -175,7 +175,6 @@ let GetRangeOfDiagnostic(err: PhasedDiagnostic) =
       | ConstraintSolverTypesNotInEqualityRelation(_, _, _, m, _, _)
       | ConstraintSolverError(_, m, _)
       | ConstraintSolverTypesNotInSubsumptionRelation(_, _, _, m, _)
-      | ConstraintSolverRelatedInformation(_, m, _)
       | SelfRefObjCtor(_, m) ->
           Some m
 
@@ -373,6 +372,7 @@ let IsWarningOrInfoEnabled (err, severity) n level specificWarnOn =
     match n with
     | 1182 -> false // chkUnusedValue - off by default
     | 3180 -> false // abImplicitHeapAllocation - off by default
+    | 3186 -> false // pickleMissingDefinition - off by default
     | 3366 -> false //tcIndexNotationDeprecated - currently off by default
     | 3517 -> false // optFailedToInlineSuggestedValue - off by default
     | 3388 -> false // tcSubsumptionImplicitConversionUsed - off by default
@@ -385,9 +385,6 @@ let IsWarningOrInfoEnabled (err, severity) n level specificWarnOn =
 let SplitRelatedDiagnostics(err: PhasedDiagnostic) : PhasedDiagnostic * PhasedDiagnostic list =
     let ToPhased e = {Exception=e; Phase = err.Phase}
     let rec SplitRelatedException = function
-      | ConstraintSolverRelatedInformation(fopt, m2, e) ->
-          let e, related = SplitRelatedException e
-          ConstraintSolverRelatedInformation(fopt, m2, e.Exception)|>ToPhased, related
       | ErrorFromAddingTypeEquation(g, denv, t1, t2, e, m) ->
           let e, related = SplitRelatedException e
           ErrorFromAddingTypeEquation(g, denv, t1, t2, e.Exception, m)|>ToPhased, related
@@ -664,12 +661,6 @@ let OutputPhasedErrorR (os: StringBuilder) (err: PhasedDiagnostic) (canSuggestNa
          if m.StartLine <> m2.StartLine then
             os.Append(SeeAlsoE().Format (stringOfRange m2)) |> ignore
 
-      | ConstraintSolverRelatedInformation(fopt, _, e) ->
-          match e with
-          | ConstraintSolverError _ -> OutputExceptionR os e
-          | _ -> ()
-          fopt |> Option.iter (Printf.bprintf os " %s")
-
       | ErrorFromAddingTypeEquation(g, denv, t1, t2, ConstraintSolverTypesNotInEqualityRelation(_, t1', t2', m, _, contextInfo), _)
          when typeEquiv g t1 t1'
               && typeEquiv g t2 t2' ->