Inline isRecdTy (#8274)

Author: forki

src/fsharp/NameResolution.fs

@@ -3214,11 +3214,12 @@ let ResolveFieldPrim sink (ncenv: NameResolver) nenv ad ty (mp, id: Ident) allFi
             |> ListSet.setify (fun fref1 fref2 -> tyconRefEq g fref1.TyconRef fref2.TyconRef)
             |> List.map (fun x -> ResolutionInfo.Empty, FieldResolution(x, false))
 
-        if isAppTy g ty then
+        match tryDestAppTy g ty with
+        | ValueSome tcref ->
             match ncenv.InfoReader.TryFindRecdOrClassFieldInfoOfType(id.idText, m, ty) with
             | ValueSome (RecdFieldInfo(_, rfref)) -> [ResolutionInfo.Empty, FieldResolution(rfref, false)]
             | _ ->
-                if isRecdTy g ty then
+                if tcref.IsRecordTycon then
                     // record label doesn't belong to record type -> suggest other labels of same record
                     let suggestLabels (addToBuffer: string -> unit) = 
                         for label in SuggestOtherLabelsOfSameRecordType g nenv ty id allFields do
@@ -3229,7 +3230,7 @@ let ResolveFieldPrim sink (ncenv: NameResolver) nenv ad ty (mp, id: Ident) allFi
                     error(ErrorWithSuggestions(errorText, m, id.idText, suggestLabels))
                 else
                     lookup()
-        else
+        | _ ->
             lookup()
     | _ ->
         let lid = (mp@[id])

src/fsharp/TypeChecker.fs

@@ -6876,7 +6876,7 @@ and TcObjectExpr cenv overallTy env tpenv (synObjTy, argopt, binds, extraImpls,
     match tryDestAppTy cenv.g objTy with
     | ValueNone -> error(Error(FSComp.SR.tcNewMustBeUsedWithNamedType(), mNewExpr))
     | ValueSome tcref ->
-    let isRecordTy = isRecdTy cenv.g objTy
+    let isRecordTy = tcref.IsRecordTycon
     if not isRecordTy && not (isInterfaceTy cenv.g objTy) && isSealedTy cenv.g objTy then errorR(Error(FSComp.SR.tcCannotCreateExtensionOfSealedType(), mNewExpr))
 
     CheckSuperType cenv objTy synObjTy.Range 
@@ -7265,12 +7265,12 @@ and TcAnonRecdExpr cenv overallTy env tpenv (isStruct, optOrigSynExpr, unsortedF
                    for (i, id) in Array.indexed anonInfo.SortedIds do 
                        yield id, Choice2Of2 (mkAnonRecdFieldGetViaExprAddr (anonInfo, oldveaddr, tinst, i, mOrigExpr))
                | ValueNone -> 
-                    if isRecdTy cenv.g origExprTy then
-                        let tcref, tinst = destAppTy cenv.g origExprTy
+                    match tryAppTy cenv.g origExprTy with
+                    | ValueSome(tcref, tinst) when tcref.IsRecordTycon ->
                         let fspecs = tcref.Deref.TrueInstanceFieldsAsList
                         for fspec in fspecs do
                             yield fspec.Id, Choice2Of2 (mkRecdFieldGetViaExprAddr (oldveaddr, tcref.MakeNestedRecdFieldRef fspec, tinst, mOrigExpr)) 
-                    else
+                    | _ ->
                         error (Error (FSComp.SR.tcCopyAndUpdateNeedsRecordType(), mOrigExpr)) |]
             |> Array.distinctBy (fst >> textOfId)