272/// The delegate is invoked by <see cref="VisitConversion(BoundConversion, BoundExpression, Conversion, TypeWithAnnotations, TypeWithState, bool, bool, bool, AssignmentKind, ParameterSymbol, bool, bool, bool, bool, Optional&lt;LocalState&gt;,bool, int, Location, ArrayBuilder&lt;VisitResult&gt;)"/>. 2448AssignmentKind assignmentKind = AssignmentKind.Assignment, 2476ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullAsNonNullable, location); 2478else if (assignmentKind == AssignmentKind.Argument) 2498ReportDiagnostic(assignmentKind == AssignmentKind.Return ? ErrorCode.WRN_NullReferenceReturn : ErrorCode.WRN_NullReferenceAssignment, location); 3068assignmentKind: AssignmentKind.Assignment); 3120returnState = VisitOptionalImplicitConversion(expr, returnType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return); 3740valueType = VisitOptionalImplicitConversion(initializer, targetTypeOpt: inferredType ? default : type, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 4126assignmentKind: AssignmentKind.Argument, 4164useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment, delayCompletionForTargetType: true).completion; 4740VisitOptionalImplicitConversion(node.Right, type, useLegacyWarnings: false, trackMembers: true, AssignmentKind.Assignment, delayCompletionForType); 5114_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Assignment); 5159fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: true, reportTopLevelWarnings: false); 5171checkConversion: true, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Assignment, reportRemainingWarnings: false); 5274checkConversion: false, fromExplicitCast: false, useLegacyWarnings: false, AssignmentKind.Return, 5662AssignmentKind.Argument); 5775AssignmentKind.Argument, 6157TypeWithState rightResult = VisitOptionalImplicitConversion(rightOperand, targetType, useLegacyWarnings: UseLegacyWarnings(leftOperand), trackMembers: false, AssignmentKind.Assignment); 6254AssignmentKind.Assignment, 6295assignmentKind: AssignmentKind.Assignment); 6722AssignmentKind.Assignment, 8247assignmentKind: AssignmentKind.Argument, 9272AssignmentKind.Assignment, 9286private TypeWithState VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind) 9303AssignmentKind assignmentKind, 9315bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, 9349Func<TypeWithAnnotations, TypeWithState> visitConversionAsContinuation(BoundExpression expr, bool useLegacyWarnings, bool trackMembers, AssignmentKind assignmentKind, BoundExpression operand, Conversion conversion, TypeWithState operandType) 9508AssignmentKind assignmentKind, 9820AssignmentKind assignmentKind, 10204if (assignmentKind == AssignmentKind.Argument) 10438AssignmentKind assignmentKind, 10505AssignmentKind.Argument, 10591AssignmentKind assignmentKind, 10672AssignmentKind.Argument, 10832AssignmentKind assignmentKind, 10844if (assignmentKind == AssignmentKind.Argument) 11265rightState = VisitOptionalImplicitConversion(right, targetTypeOpt: discarded ? default : leftLValueType, UseLegacyWarnings(left), trackMembers: true, AssignmentKind.Assignment); 11587valueType = VisitOptionalImplicitConversion(rightPart, lvalueType, useLegacyWarnings: true, trackMembers: true, AssignmentKind.Assignment); 11604AssignmentKind.Assignment, 11807AssignmentKind assignmentKind = AssignmentKind.Assignment; 11837assignmentKind = AssignmentKind.Argument; 11890AssignmentKind.Assignment); 12032assignmentKind: AssignmentKind.Assignment); 12531AssignmentKind.Assignment); 12697AssignmentKind.ForEachIterationVariable, 12841assignmentKind: AssignmentKind.Argument, 13074assignmentKind: AssignmentKind.Argument, 13667_ = VisitOptionalImplicitConversion(expr, elementType, useLegacyWarnings: false, trackMembers: false, AssignmentKind.Return);