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)

1148var better = BetterOperator(candidates[i].Signature, candidates[j].Signature, left, right, ref useSiteInfo); 1149if (better == BetterResult.Left) 1153else if (better == BetterResult.Right) 1182var better = BetterOperator(candidates[currentBestIndex].Signature, candidates[index].Signature, left, right, ref useSiteInfo); 1183if (better == BetterResult.Right) 1188else if (better != BetterResult.Left) 1204var better = BetterOperator(candidates[currentBestIndex].Signature, candidates[index].Signature, left, right, ref useSiteInfo); 1205if (better != BetterResult.Left) 1215private BetterResult BetterOperator(BinaryOperatorSignature op1, BinaryOperatorSignature op2, BoundExpression left, BoundExpression right, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 1221return (op1.Priority.GetValueOrDefault() < op2.Priority.GetValueOrDefault()) ? BetterResult.Left : BetterResult.Right; 1224BetterResult leftBetter = BetterConversionFromExpression(left, op1.LeftType, op2.LeftType, ref useSiteInfo); 1225BetterResult rightBetter = BetterConversionFromExpression(right, op1.RightType, op2.RightType, ref useSiteInfo); 1246if (leftBetter == BetterResult.Left && rightBetter != BetterResult.Right || 1247leftBetter != BetterResult.Right && rightBetter == BetterResult.Left) 1249return BetterResult.Left; 1252if (leftBetter == BetterResult.Right && rightBetter != BetterResult.Left || 1253leftBetter != BetterResult.Left && rightBetter == BetterResult.Right) 1255return BetterResult.Right; 1272return BetterResult.Left; 1277return BetterResult.Right; 1300BetterResult result = MoreSpecificOperator(op1, op2, ref useSiteInfo); 1301if (result == BetterResult.Left || result == BetterResult.Right) 1314return BetterResult.Right; 1318return BetterResult.Left; 1323BetterResult valOverInPreference; 1327valOverInPreference = BetterResult.Left; 1331valOverInPreference = BetterResult.Right; 1335valOverInPreference = BetterResult.Neither; 1340if (valOverInPreference == BetterResult.Right) 1342return BetterResult.Neither; 1346valOverInPreference = BetterResult.Left; 1351if (valOverInPreference == BetterResult.Left) 1353return BetterResult.Neither; 1357valOverInPreference = BetterResult.Right; 1364private BetterResult MoreSpecificOperator(BinaryOperatorSignature op1, BinaryOperatorSignature op2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 1410BetterResult result = MoreSpecificType(ref uninst1.AsRef(), ref uninst2.AsRef(), ref useSiteInfo);

365var better = BetterOperator(candidates[i].Signature, candidates[j].Signature, operand, ref useSiteInfo); 366if (better == BetterResult.Left) 370else if (better == BetterResult.Right) 398var better = BetterOperator(candidates[currentBestIndex].Signature, candidates[index].Signature, operand, ref useSiteInfo); 399if (better == BetterResult.Right) 404else if (better != BetterResult.Left) 420var better = BetterOperator(candidates[currentBestIndex].Signature, candidates[index].Signature, operand, ref useSiteInfo); 421if (better != BetterResult.Left) 431private BetterResult BetterOperator(UnaryOperatorSignature op1, UnaryOperatorSignature op2, BoundExpression operand, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 436BetterResult better = BetterConversionFromExpression(operand, op1.OperandType, op2.OperandType, ref useSiteInfo); 438if (better == BetterResult.Left || better == BetterResult.Right) 456return BetterResult.Left; 461return BetterResult.Right; 481return BetterResult.Right; 485return BetterResult.Left; 492return BetterResult.Left; 496return BetterResult.Right; 499return BetterResult.Neither;

1811var better = BetterFunctionMember(results[currentBestIndex], results[index], arguments.Arguments, ref useSiteInfo); 1812if (better == BetterResult.Right) 1817else if (better != BetterResult.Left) 1838var better = BetterFunctionMember(results[currentBestIndex], results[index], arguments.Arguments, ref useSiteInfo); 1839if (better != BetterResult.Left) 2013var better = BetterFunctionMember(c1Result, c2Result, arguments.Arguments, ref useSiteInfo); 2014if (better == BetterResult.Left) 2018else if (better == BetterResult.Right) 2053results[i] = BetterResult.Left == BetterFunctionMember(results[notBestIdx], results[i], arguments.Arguments, ref useSiteInfo) 2088private BetterResult BetterFunctionMember<TMember>( 2104return BetterResult.Left; 2106return BetterResult.Right; 2119return hasAnyRefOmittedArgument1 ? BetterResult.Right : BetterResult.Left; 2127private BetterResult BetterFunctionMember<TMember>( 2147BetterResult result = BetterResult.Neither; 2182BetterResult r; 2207if (r == BetterResult.Neither) 2224if (result == BetterResult.Neither) 2247result = BetterResult.Neither; 2268result = BetterResult.Neither; 2274Debug.Assert(result == BetterResult.Left || result == BetterResult.Right); 2281if (result != BetterResult.Neither) 2362return BetterResult.Right; 2368return BetterResult.Left; 2377return BetterResult.Left; 2381return BetterResult.Right; 2393return BetterResult.Left; 2398return BetterResult.Right; 2406return BetterResult.Left; 2411return BetterResult.Right; 2429return BetterResult.Left; 2434return BetterResult.Right; 2446return BetterResult.Left; 2451return BetterResult.Right; 2486if (result != BetterResult.Neither) 2506return BetterResult.Left; 2511return BetterResult.Right; 2520return (m1ModifierCount < m2ModifierCount) ? BetterResult.Left : BetterResult.Right; 2526if (result != BetterResult.Neither) 2556var betterResult = BetterParamsCollectionType(t1, t2, ref useSiteInfo); 2557if (betterResult != BetterResult.Neither) 2565return BetterResult.Neither; 2607static BetterResult preferValOverInOrRefInterpolatedHandlerParameters( 2614BetterResult valOverInOrRefInterpolatedHandlerPreference = BetterResult.Neither; 2639if (valOverInOrRefInterpolatedHandlerPreference == BetterResult.Right) 2641return BetterResult.Neither; 2645valOverInOrRefInterpolatedHandlerPreference = BetterResult.Left; 2650if (valOverInOrRefInterpolatedHandlerPreference == BetterResult.Left) 2652return BetterResult.Neither; 2656valOverInOrRefInterpolatedHandlerPreference = BetterResult.Right; 2743private static BetterResult MoreSpecificType(ref TemporaryArray<TypeSymbol> t1, ref TemporaryArray<TypeSymbol> t2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 2750var result = BetterResult.Neither; 2753var r = MoreSpecificType(t1[i], t2[i], ref useSiteInfo); 2754if (r == BetterResult.Neither) 2758else if (result == BetterResult.Neither) 2768return BetterResult.Neither; 2775private static BetterResult MoreSpecificType(TypeSymbol t1, TypeSymbol t2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 2785return BetterResult.Right; 2790return BetterResult.Left; 2795return BetterResult.Neither; 2829return BetterResult.Neither; 2844return BetterResult.Neither; 2857var result = MoreSpecificType(ref allTypeArgs1.AsRef(), ref allTypeArgs2.AsRef(), ref useSiteInfo); 2863private BetterResult BetterConversionFromExpression(BoundExpression node, TypeSymbol t1, TypeSymbol t2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 2877private BetterResult BetterConversionFromExpression( 2916return conv1.Kind == ConversionKind.Identity ? BetterResult.Left : BetterResult.Neither; 2920return conv2.Kind == ConversionKind.Identity ? BetterResult.Right : BetterResult.Neither; 2925return BetterResult.Neither; 2933private BetterResult BetterConversionFromExpression(BoundExpression node, TypeSymbol t1, Conversion conv1, TypeSymbol t2, Conversion conv2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo, out bool okToDowngradeToNeither) 2940return BetterResult.Neither; 2952return BetterResult.Neither; 2973return BetterResult.Neither; 2975return BetterResult.Left; 2977return BetterResult.Right; 2986return BetterResult.Left; 2988return BetterResult.Right; 3002okToDowngradeToNeither = lambdaOpt != null && CanDowngradeConversionFromLambdaToNeither(BetterResult.Left, lambdaOpt, t1, t2, ref useSiteInfo, false); 3003return BetterResult.Left; 3008okToDowngradeToNeither = lambdaOpt != null && CanDowngradeConversionFromLambdaToNeither(BetterResult.Right, lambdaOpt, t1, t2, ref useSiteInfo, false); 3009return BetterResult.Right; 3014return BetterResult.Left; 3016return BetterResult.Right; 3030return BetterResult.Right; 3032return BetterResult.Left; 3040private BetterResult BetterCollectionExpressionConversion( 3053return BetterResult.Left; 3057return BetterResult.Right; 3060return BetterResult.Neither; 3074private BetterResult BetterCollectionExpressionConversion( 3101return BetterResult.Left; 3103return BetterResult.Right; 3120var betterResult = BetterResult.Neither; 3131BetterResult elementBetterResult; 3141if (elementBetterResult == BetterResult.Neither) 3146if (betterResult != BetterResult.Neither) 3150return BetterResult.Neither; 3171return BetterResult.Left; 3175return BetterResult.Right; 3179return BetterResult.Neither; 3218private BetterResult BetterParamsCollectionType(TypeSymbol t1, TypeSymbol t2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo) 3444private BetterResult BetterConversionTargetCore( 3452return BetterResult.Neither; 3459private BetterResult BetterConversionTarget( 3471private BetterResult BetterConversionTargetCore( 3486return BetterResult.Neither; 3494return BetterResult.Left; 3498return BetterResult.Right; 3506return BetterResult.Neither; 3521return BetterResult.Neither; 3525okToDowngradeToNeither = lambdaOpt != null && CanDowngradeConversionFromLambdaToNeither(BetterResult.Left, lambdaOpt, type1, type2, ref useSiteInfo, true); 3526return BetterResult.Left; 3531okToDowngradeToNeither = lambdaOpt != null && CanDowngradeConversionFromLambdaToNeither(BetterResult.Right, lambdaOpt, type1, type2, ref useSiteInfo, true); 3532return BetterResult.Right; 3549return BetterResult.Neither; 3554return BetterResult.Neither; 3575BetterResult delegateResult = BetterResult.Neither; 3582delegateResult = BetterResult.Left; 3588delegateResult = BetterResult.Right; 3591if (delegateResult == BetterResult.Neither) 3604if (delegateResult == BetterResult.Left) 3608return BetterResult.Neither; 3611else if (delegateResult == BetterResult.Right && IsMethodGroupConversionIncompatibleWithDelegate(group, d2, conv2)) 3613return BetterResult.Neither; 3622return BetterResult.Neither; 3627return BetterResult.Neither; 3639return BetterResult.Left; 3644return BetterResult.Right; 3647return BetterResult.Neither; 3677private bool CanDowngradeConversionFromLambdaToNeither(BetterResult currentResult, UnboundLambda lambda, TypeSymbol type1, TypeSymbol type2, ref CompoundUseSiteInfo<AssemblySymbol> useSiteInfo, bool fromTypeAnalysis) 3729Debug.Assert(currentResult == BetterResult.Right); 3734Debug.Assert(currentResult == BetterResult.Left);