735return BetterResult.Equal; 742return BetterResult.Neither; 744return leftWins ? BetterResult.Left : BetterResult.Right; 774return BetterResult.Equal; 781return BetterResult.Neither; 783return leftWins ? BetterResult.Left : BetterResult.Right; 804private static int? UniqueBestValidIndex<T>(ImmutableArray<T> items, Func<T, bool> valid, Func<T, T, BetterResult> better) 829BetterResult result = better(candidateItem, currentItem); 831if (result == BetterResult.Equal) 836else if (result == BetterResult.Neither) 844else if (result == BetterResult.Right) 871BetterResult result = better(candidateItem, currentItem); 872if (result != BetterResult.Left && result != BetterResult.Equal)

1156var better = BetterOperator(candidates[i].Signature, candidates[j].Signature, left, right, ref useSiteInfo); 1157if (better == BetterResult.Left) 1161else if (better == BetterResult.Right) 1190var better = BetterOperator(candidates[currentBestIndex].Signature, candidates[index].Signature, left, right, ref useSiteInfo); 1191if (better == BetterResult.Right) 1196else if (better != BetterResult.Left) 1212var better = BetterOperator(candidates[currentBestIndex].Signature, candidates[index].Signature, left, right, ref useSiteInfo); 1213if (better != BetterResult.Left) 1223private BetterResult BetterOperator(BinaryOperatorSignature op1, BinaryOperatorSignature op2, BoundExpression left, BoundExpression right, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 1229return (op1.Priority.GetValueOrDefault() < op2.Priority.GetValueOrDefault()) ? BetterResult.Left : BetterResult.Right; 1232BetterResult leftBetter = BetterConversionFromExpression(left, op1.LeftType, op2.LeftType, ref useSiteInfo); 1233BetterResult rightBetter = BetterConversionFromExpression(right, op1.RightType, op2.RightType, ref useSiteInfo); 1254if (leftBetter == BetterResult.Left && rightBetter != BetterResult.Right || 1255leftBetter != BetterResult.Right && rightBetter == BetterResult.Left) 1257return BetterResult.Left; 1260if (leftBetter == BetterResult.Right && rightBetter != BetterResult.Left || 1261leftBetter != BetterResult.Left && rightBetter == BetterResult.Right) 1263return BetterResult.Right; 1280return BetterResult.Left; 1285return BetterResult.Right; 1308BetterResult result = MoreSpecificOperator(op1, op2, ref useSiteInfo); 1309if (result == BetterResult.Left || result == BetterResult.Right) 1322return BetterResult.Right; 1326return BetterResult.Left; 1331BetterResult valOverInPreference; 1335valOverInPreference = BetterResult.Left; 1339valOverInPreference = BetterResult.Right; 1343valOverInPreference = BetterResult.Neither; 1348if (valOverInPreference == BetterResult.Right) 1350return BetterResult.Neither; 1354valOverInPreference = BetterResult.Left; 1359if (valOverInPreference == BetterResult.Left) 1361return BetterResult.Neither; 1365valOverInPreference = BetterResult.Right; 1372private BetterResult MoreSpecificOperator(BinaryOperatorSignature op1, BinaryOperatorSignature op2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 1418BetterResult result = MoreSpecificType(ref uninst1.AsRef(), ref uninst2.AsRef(), ref useSiteInfo);

361var better = BetterOperator(candidates[i].Signature, candidates[j].Signature, operand, ref useSiteInfo); 362if (better == BetterResult.Left) 366else if (better == BetterResult.Right) 394var better = BetterOperator(candidates[currentBestIndex].Signature, candidates[index].Signature, operand, ref useSiteInfo); 395if (better == BetterResult.Right) 400else if (better != BetterResult.Left) 416var better = BetterOperator(candidates[currentBestIndex].Signature, candidates[index].Signature, operand, ref useSiteInfo); 417if (better != BetterResult.Left) 427private BetterResult BetterOperator(UnaryOperatorSignature op1, UnaryOperatorSignature op2, BoundExpression operand, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 432BetterResult better = BetterConversionFromExpression(operand, op1.OperandType, op2.OperandType, ref useSiteInfo); 434if (better == BetterResult.Left || better == BetterResult.Right) 452return BetterResult.Left; 457return BetterResult.Right; 477return BetterResult.Right; 481return BetterResult.Left; 488return BetterResult.Left; 492return BetterResult.Right; 495return BetterResult.Neither;

1818var better = BetterFunctionMember(results[currentBestIndex], results[index], arguments.Arguments, ref useSiteInfo); 1819if (better == BetterResult.Right) 1824else if (better != BetterResult.Left) 1845var better = BetterFunctionMember(results[currentBestIndex], results[index], arguments.Arguments, ref useSiteInfo); 1846if (better != BetterResult.Left) 2020var better = BetterFunctionMember(c1Result, c2Result, arguments.Arguments, ref useSiteInfo); 2021if (better == BetterResult.Left) 2025else if (better == BetterResult.Right) 2060results[i] = BetterResult.Left == BetterFunctionMember(results[notBestIdx], results[i], arguments.Arguments, ref useSiteInfo) 2095private BetterResult BetterFunctionMember<TMember>( 2111return BetterResult.Left; 2113return BetterResult.Right; 2126return hasAnyRefOmittedArgument1 ? BetterResult.Right : BetterResult.Left; 2134private BetterResult BetterFunctionMember<TMember>( 2154BetterResult result = BetterResult.Neither; 2189BetterResult r; 2214if (r == BetterResult.Neither) 2231if (result == BetterResult.Neither) 2254result = BetterResult.Neither; 2275result = BetterResult.Neither; 2281Debug.Assert(result == BetterResult.Left || result == BetterResult.Right); 2288if (result != BetterResult.Neither) 2369return BetterResult.Right; 2375return BetterResult.Left; 2384return BetterResult.Left; 2388return BetterResult.Right; 2400return BetterResult.Left; 2405return BetterResult.Right; 2413return BetterResult.Left; 2418return BetterResult.Right; 2436return BetterResult.Left; 2441return BetterResult.Right; 2453return BetterResult.Left; 2458return BetterResult.Right; 2493if (result != BetterResult.Neither) 2513return BetterResult.Left; 2518return BetterResult.Right; 2527return (m1ModifierCount < m2ModifierCount) ? BetterResult.Left : BetterResult.Right; 2533if (result != BetterResult.Neither) 2563var betterResult = BetterParamsCollectionType(t1, t2, ref useSiteInfo); 2564if (betterResult != BetterResult.Neither) 2572return BetterResult.Neither; 2614static BetterResult preferValOverInOrRefInterpolatedHandlerParameters( 2621BetterResult valOverInOrRefInterpolatedHandlerPreference = BetterResult.Neither; 2646if (valOverInOrRefInterpolatedHandlerPreference == BetterResult.Right) 2648return BetterResult.Neither; 2652valOverInOrRefInterpolatedHandlerPreference = BetterResult.Left; 2657if (valOverInOrRefInterpolatedHandlerPreference == BetterResult.Left) 2659return BetterResult.Neither; 2663valOverInOrRefInterpolatedHandlerPreference = BetterResult.Right; 2750private static BetterResult MoreSpecificType(ref TemporaryArray<TypeSymbol> t1, ref TemporaryArray<TypeSymbol> t2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 2757var result = BetterResult.Neither; 2760var r = MoreSpecificType(t1[i], t2[i], ref useSiteInfo); 2761if (r == BetterResult.Neither) 2765else if (result == BetterResult.Neither) 2775return BetterResult.Neither; 2782private static BetterResult MoreSpecificType(TypeSymbol t1, TypeSymbol t2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 2792return BetterResult.Right; 2797return BetterResult.Left; 2802return BetterResult.Neither; 2836return BetterResult.Neither; 2851return BetterResult.Neither; 2864var result = MoreSpecificType(ref allTypeArgs1.AsRef(), ref allTypeArgs2.AsRef(), ref useSiteInfo); 2870private BetterResult BetterConversionFromExpression(BoundExpression node, TypeSymbol t1, TypeSymbol t2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 2884private BetterResult BetterConversionFromExpression( 2923return conv1.Kind == ConversionKind.Identity ? BetterResult.Left : BetterResult.Neither; 2927return conv2.Kind == ConversionKind.Identity ? BetterResult.Right : BetterResult.Neither; 2932return BetterResult.Neither; 2940private BetterResult BetterConversionFromExpression(BoundExpression node, TypeSymbol t1, Conversion conv1, TypeSymbol t2, Conversion conv2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo, out bool okToDowngradeToNeither) 2947return BetterResult.Neither; 2959return BetterResult.Neither; 2980return BetterResult.Neither; 2982return BetterResult.Left; 2984return BetterResult.Right; 2993return BetterResult.Left; 2995return BetterResult.Right; 3009okToDowngradeToNeither = lambdaOpt != null && CanDowngradeConversionFromLambdaToNeither(BetterResult.Left, lambdaOpt, t1, t2, ref useSiteInfo, false); 3010return BetterResult.Left; 3015okToDowngradeToNeither = lambdaOpt != null && CanDowngradeConversionFromLambdaToNeither(BetterResult.Right, lambdaOpt, t1, t2, ref useSiteInfo, false); 3016return BetterResult.Right; 3021return BetterResult.Left; 3023return BetterResult.Right; 3037return BetterResult.Right; 3039return BetterResult.Left; 3047private BetterResult BetterCollectionExpressionConversion( 3060return BetterResult.Left; 3064return BetterResult.Right; 3067return BetterResult.Neither; 3081private BetterResult BetterCollectionExpressionConversion( 3108return BetterResult.Left; 3110return BetterResult.Right; 3127var betterResult = BetterResult.Neither; 3138BetterResult elementBetterResult; 3148if (elementBetterResult == BetterResult.Neither) 3153if (betterResult != BetterResult.Neither) 3157return BetterResult.Neither; 3178return BetterResult.Left; 3182return BetterResult.Right; 3186return BetterResult.Neither; 3225private BetterResult BetterParamsCollectionType(TypeSymbol t1, TypeSymbol t2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 3451private BetterResult BetterConversionTargetCore( 3459return BetterResult.Neither; 3466private BetterResult BetterConversionTarget( 3478private BetterResult BetterConversionTargetCore( 3493return BetterResult.Neither; 3501return BetterResult.Left; 3505return BetterResult.Right; 3513return BetterResult.Neither; 3528return BetterResult.Neither; 3532okToDowngradeToNeither = lambdaOpt != null && CanDowngradeConversionFromLambdaToNeither(BetterResult.Left, lambdaOpt, type1, type2, ref useSiteInfo, true); 3533return BetterResult.Left; 3538okToDowngradeToNeither = lambdaOpt != null && CanDowngradeConversionFromLambdaToNeither(BetterResult.Right, lambdaOpt, type1, type2, ref useSiteInfo, true); 3539return BetterResult.Right; 3556return BetterResult.Neither; 3561return BetterResult.Neither; 3582BetterResult delegateResult = BetterResult.Neither; 3589delegateResult = BetterResult.Left; 3595delegateResult = BetterResult.Right; 3598if (delegateResult == BetterResult.Neither) 3611if (delegateResult == BetterResult.Left) 3615return BetterResult.Neither; 3618else if (delegateResult == BetterResult.Right && IsMethodGroupConversionIncompatibleWithDelegate(group, d2, conv2)) 3620return BetterResult.Neither; 3629return BetterResult.Neither; 3634return BetterResult.Neither; 3646return BetterResult.Left; 3651return BetterResult.Right; 3654return BetterResult.Neither; 3684private bool CanDowngradeConversionFromLambdaToNeither(BetterResult currentResult, UnboundLambda lambda, TypeSymbol type1, TypeSymbol type2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo, bool fromTypeAnalysis) 3736Debug.Assert(currentResult == BetterResult.Right); 3741Debug.Assert(currentResult == BetterResult.Left);