Remove isAppTy (#9246)

src/fsharp/AccessibilityLogic.fs

@@ -208,12 +208,13 @@ and IsTypeInstAccessible g amap m ad tinst =
 /// Indicate if a provided member is accessible
 let IsProvidedMemberAccessible (amap:Import.ImportMap) m ad ty access = 
     let g = amap.g
-    let isTyAccessible = IsTypeAccessible g amap m ad ty
-    if not isTyAccessible then false
+    if IsTypeAccessible g amap m ad ty then 
+        match tryTcrefOfAppTy g ty with
+        | ValueNone -> true
+        | ValueSome tcrefOfViewedItem ->
+            IsILMemberAccessible g amap m tcrefOfViewedItem ad access
     else
-        not (isAppTy g ty) ||
-        let tcrefOfViewedItem = tcrefOfAppTy g ty
-        IsILMemberAccessible g amap m tcrefOfViewedItem ad access
+        false
 
 /// Compute the accessibility of a provided member
 let ComputeILAccess isPublic isFamily isFamilyOrAssembly isFamilyAndAssembly =

src/fsharp/LowerCallsAndSeqs.fs

@@ -542,7 +542,11 @@ let ConvertSequenceExprToObject g amap overallExpr =
                 // printfn "FAILED - not worth compiling an unrecognized immediate yield! %s " (stringOfRange m)
                 None
             else
-                let tyConfirmsToSeq g ty = isAppTy g ty && tyconRefEq g (tcrefOfAppTy g ty) g.tcref_System_Collections_Generic_IEnumerable
+                let tyConfirmsToSeq g ty = 
+                    match tryTcrefOfAppTy g ty with
+                    | ValueSome tcref ->
+                        tyconRefEq g tcref g.tcref_System_Collections_Generic_IEnumerable
+                    | _ -> false 
                 match SearchEntireHierarchyOfType (tyConfirmsToSeq g) g amap m (tyOfExpr g arbitrarySeqExpr) with
                 | None ->
                     // printfn "FAILED - yield! did not yield a sequence! %s" (stringOfRange m)

src/fsharp/MethodCalls.fs

@@ -848,8 +848,8 @@ let MakeMethInfoCall amap m minfo minst args =
 let TryImportProvidedMethodBaseAsLibraryIntrinsic (amap: Import.ImportMap, m: range, mbase: Tainted<ProvidedMethodBase>) = 
     let methodName = mbase.PUntaint((fun x -> x.Name), m)
     let declaringType = Import.ImportProvidedType amap m (mbase.PApply((fun x -> x.DeclaringType), m))
-    if isAppTy amap.g declaringType then 
-        let declaringEntity = tcrefOfAppTy amap.g declaringType
+    match tryTcrefOfAppTy amap.g declaringType with
+    | ValueSome declaringEntity ->
         if not declaringEntity.IsLocalRef && ccuEq declaringEntity.nlr.Ccu amap.g.fslibCcu then
             match amap.g.knownIntrinsics.TryGetValue ((declaringEntity.LogicalName, methodName)) with 
             | true, vref -> Some vref
@@ -861,7 +861,7 @@ let TryImportProvidedMethodBaseAsLibraryIntrinsic (amap: Import.ImportMap, m: ra
             | _ -> None
         else
             None
-    else
+    | _ ->
         None
 #endif
         

src/fsharp/NameResolution.fs

@@ -2398,10 +2398,10 @@ let rec ResolveLongIdentInTypePrim (ncenv: NameResolver) nenv lookupKind (resInf
             | _ -> ()
 
         let errorTextF s =
-            if isAppTy g ty then
-                let tcref = tcrefOfAppTy g ty
+            match tryTcrefOfAppTy g ty with
+            | ValueSome tcref ->
                 FSComp.SR.undefinedNameFieldConstructorOrMemberWhenTypeIsKnown(tcref.DisplayNameWithStaticParametersAndTypars, s)
-            else
+            | _ ->
                 FSComp.SR.undefinedNameFieldConstructorOrMember(s)
 
         raze (UndefinedName (depth, errorTextF, id, suggestMembers))